Tootfinder

Ultrafast dynamics of quantum matter driven by time-energy entangled photons
Giovanni Citeroni, Marco Polini, Michael Dapolito, D. N. Basov, Giacomo Mazza
https://arxiv.org/abs/2506.12211

Ultrafast dynamics of quantum matter driven by time-energy entangled photons
We study the dynamics of quantum matter interacting with time-energy entangled photons. We consider the stimulation of a collective mode of a two-dimensional material by means of one of the two partners of a time-energy entangled pair of photons. Using an exactly solvable model, we analyze the out-of-equilibrium properties of both light and matter degrees of freedom, and show how entanglement in the incident photons deeply modifies relevant time scales of the light-matter interaction process. W…

Heating, Excitation, Dissociation, and Ionization of Molecules by High-Energy Photons in Planetary Atmospheres
Antonio Garc\'ia Mu\~noz, Ewan Bataille
https://arxiv.org/abs/2506.12956

Heating, Excitation, Dissociation, and Ionization of Molecules by High-Energy Photons in Planetary Atmospheres
Photoionization by high-energy photons creates nonthermal electrons with a broad range of energies that heat and chemically transform the atmospheres of planets. The specifics of the interactions are notably different when the gas is atomic or molecular. Motivated by the idea that molecules survive to high altitudes in some exoplanets, we built a model for the energy transfer from nonthermal electrons to the H2O, H2, and O2 molecules. Our calculations show that the primary electrons of energy a…

Monophotons at Neutrino Experiments from Neutrino Polarizability
Julia Gehrlein, Ian M. Shoemaker, Anil Thapa
https://arxiv.org/abs/2506.14881 https://

Monophotons at Neutrino Experiments from Neutrino Polarizability
Nontrivial electromagnetic properties of neutrinos are an avenue to physics beyond the Standard Model. To this end, we investigate the power of monophoton signals at neutrino experiments to probe a higher-dimensional operator connecting neutrinos to SM photons dubbed, neutrino polarizability. A simplified scenario giving rise to this operator involves a new pseudo-scalar that couples to both neutrinos and photons, with clear implications for axion-like particle (ALP) and Majoron physics. By ana…

Hybrid quantum lattice model: Polaritons, photons, and spin waves propagation
Maritza Ahumada, Natalia Valderrama-Quinteros, Diego Tancara, Guillermo Romero
https://arxiv.org/abs/2507.12319

Hybrid quantum lattice model: Polaritons, photons, and spin waves propagation
Controlling the propagation of quantum excitations in low-dimensional quantum systems is pivotal for advancing quantum technologies, including communication networks and quantum simulators. We propose a one-dimensional hybrid quantum lattice model comprising coupled cavity quantum electrodynamics (QED) units. Each unit integrates a single-mode cavity that interacts with a two-level system (TLS), featuring direct coupling between adjacent TLLs. This configuration enables the coherent propagation…

21 cm Signal from the Thermal Evolution of Lyman-$\alpha$ during Cosmic Dawn
Janakee Raste, Shiv K. Sethi
https://arxiv.org/abs/2506.12827 https://

21 cm Signal from the Thermal Evolution of Lyman-$α$ during Cosmic Dawn
The Lyman-$α$ photons couple the spin temperature of neutral hydrogen (HI) to the kinetic temperature during the era of cosmic dawn. During this process, they also exchange energy with the medium, heating and cooling the HI. In addition, we expect X-ray photons to heat the mostly neutral gas during this era. We solve this coupled system (Lyman-$α$-HI system along with X-ray heating) for a period of 500 Myr (redshift range $8

On the Fast-radio-burst-associated X-ray Bursts: Inverse Compton Scattering of Radio Photons by an Extreme Pair Flow During Magnetosphere Activities
Yue Wu, Yuan-Pei Yang, Fa-Yin Wang, Zi-Gao Dai
https://arxiv.org/abs/2507.12405

On the Fast-radio-burst-associated X-ray Bursts: Inverse Compton Scattering of Radio Photons by an Extreme Pair Flow During Magnetosphere Activities
The Galactic fast radio burst (FRB) FRB 200428 was associated with a short X-ray burst (XRB) from the magnetar SGR J1935+2154 during one of its active phases. This FRB-associated XRB exhibits distinct properties compared to other typical XRBs, including a significantly higher cutoff energy and a steeper power-law index. Its recovered X-ray light curve shows a multiple-peak structure, with the time of arrival offset from that of the FRB. These unique features imply a special physical link betwee…

Hunting for Dark Photon-Photon Tridents
Thong T. Q. Nguyen
https://arxiv.org/abs/2506.12153 https://arxiv.org/pdf/2506.12153

Hunting for Dark Photon-Photon Tridents
Dark photons, hypothesized to be sufficiently light and/or weakly interacting, offer a compelling candidate for dark matter. Their decay into three photons, referred to as the "dark photon trident" process, becomes the dominant channel when the dark photon mass lies below the electron pair production threshold. This decay channel produces a significant flux of x-rays, presenting an opportunity for indirect detection. In this study, we analyze 16 years of x-ray data from INTEGRAL/SPI to investig…

Stochastic background of gravitational waves from cosmic-rays
Aur\'elien Barrau, Juan Garc\'ia-Bellido, Killian Martineau, Daryna Yushchenko
https://arxiv.org/abs/2506.13237

Stochastic background of gravitational waves from cosmic-rays
Cosmic-rays are charged particles moving in magnetic fields. They not only emit well-known synchrotron photons but also gravitational radiation. We clarify the characteristics of the gravitational wave signal in this specific situation and underline some unexpected features. A phenomenological approximation for the radiated power is given. We derive the shape and peaking frequency of the associated stochastic backgrounds of gravitational waves for both electrons and protons, either of galactic …

Heating of a Molecular Cloud by a Primordial Black Hole
A. N. Melikhov, E. V. Mikheeva
https://arxiv.org/abs/2506.14595 https://arxiv…

Heating of a Molecular Cloud by a Primordial Black Hole
The heating of a molecular cloud by photons emitted by a primary black hole (PBH) located inside the cloud is considered. For graphite and silicate dust particles, the dependence of dust temperature on the distance from PBH is derived, along with the emission spectrum of dust particles. The obtained spectrum is compared with the sensitivity of the Millimetron Space Observatory for various values of concentration and size of dust particles and different PBH masses.

Mid-IR hyperspectral imaging with undetected photons
Marlon Placke, Chiara Lindner, Felix Mann, Inna Kviatkovsky, Helen M. Chrzanowski, Hendrik Bartolomaeus, Frank K\"uhnemann, Sven Ramelow
https://arxiv.org/abs/2507.07861

Mid-IR hyperspectral imaging with undetected photons
Sensing with undetected photons has become a vibrant, application-driven research domain with a special focus on the mid-infrared (mid-IR) wavelength region. Since the mid-IR contains spectral bands with highly specific and strong molecular absorbance signatures, often referred to as fingerprints, a multitude of different samples and their compositions can be detected and quantified spectroscopically. Enhancing this inherently sample alteration-free spectroscopic method with imaging capabilitie…

Manifestation of quark effects in nuclei via bremsstrahlung analysis in the proton-nucleus scattering
Sergei P. Maydanyuk (Southern Center for Nuclear-Science Theory, Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, 03680, Ukraine), K. Tsushima (Laborat\'orio de F\'isica Te\'orica e Computacional - LFTC, Programa de P\'osgradua\c{c}\~ao em Astrof\'isica e F\'isica Computacional, Universidade Cidade de S\~ao Paulo, 01506-000 S\~ao Pa…

Manifestation of quark effects in nuclei via bremsstrahlung analysis in the proton-nucleus scattering
\textbf{Background} (1) The incoherent emission of photons is dominant comparing to coherent one in proton-nucleus scattering. The incoherent bremsstrahlung is very sensitive to the magnetic moments of nucleons in nuclei. (2) According to the quark-meson coupling (QMC) model, the nucleon magnetic moments in nuclei are enhanced relative to those in vacuum, originating from the quark structure of nucleons. \textbf{Purpose} Investigate possibilities of observing quark effects in nuclei by the anal…

Near transform-limited single photons from rapid-thermal annealed quantum dots
Hendrik Mannel, Fabio Rimek, Marcel Zoellner, Nico Schwarz, Andreas D. Wieck, Nikolai Bart, Arne Ludwig, Martin Geller
https://arxiv.org/abs/2507.11108

Near transform-limited single photons from rapid-thermal annealed quantum dots
Single-photon emitters are essential components for quantum communication systems, enabling applications such as secure quantum key distribution and the long-term vision of a quantum internet. Among various candidates, self-assembled InAs/GaAs quantum dots (QDs) remain highly promising due to their ability to emit coherent and indistinguishable photons, as well as their compatibility with photonic integration. In this work, we investigate the impact of post-growth rapid thermal annealing (RTA) …

Constraints on Kinetic Mixing of Dark Photons from Dilepton Spectra
A. W. Romero Jorge, E. Bratkovskaya, T. Song, L. Sagunski
https://arxiv.org/abs/2507.11163

Constraints on Kinetic Mixing of Dark Photons from Dilepton Spectra
Dark photons, the hypothetical gauge bosons associated with an additional $U(1)^{\prime}$ symmetry, can couple to Standard Model particles through a small kinetic mixing parameter $\varepsilon$ with the ordinary photon. This mechanism provides a portal between the dark sector and visible matter. In this study, we present a procedure to derive theoretical upper bounds on the kinetic mixing parameter $\varepsilon^2(M_U)$ by analyzing dilepton spectra from heavy-ion collisions across a broad energ…

Certifying spatial entanglement between non-degenerate photon pairs with a camera
Emma Brambila, Raphael Guitter, Ren\'e Sondenheimer, Markus Gr\"afe, Hugo Defienne
https://arxiv.org/abs/2506.14300

Certifying spatial entanglement between non-degenerate photon pairs with a camera
We investigate transverse spatial entanglement between photon pairs of different wavelengths using a camera-based coincidence technique. By adapting the correlation measurements to the photons frequencies, we certify the presence of entanglement between the pairs through violation of an Einstein-Podolsky-Rosen criterion. Additionally, we examine how parameters such as pump waist and crystal length influence these correlations. Our results highlight key differences from the frequency-degenerate …

The production of orbitally modulated UHE photons in LS 5039
V. Bosch-Ramon, D. Khangulyan
https://arxiv.org/abs/2507.11438 https://a…

The production of orbitally modulated UHE photons in LS 5039
Gamma-ray binaries present emission that is variable and can reach UHE. The processes behind the acceleration of the particles that produce this very energetic radiation are yet to be understood. We probe the properties of the particle accelerator and the UHE photon emitter in the gamma-ray binary LS 5039. From the properties of the binary system and the UHE radiation detected by HAWC, we used analytical tools to investigate how these properties constrain the emission and acceleration regions, …

Arago, which is developing a photonic chip, codenamed JEF, that is designed to cut AI energy use by ten times at a comparable cost, raised a $26M seed (Tamara Djurickovic/Tech.eu)
https://tech.eu/2025/07/08/arago-raises-2…

Arago raises $26M to slash AI energy consumption with breakthrough photonic chip
Arago, a deeptech startup pioneering a new class of energy-efficient AI chips powered by light, has raised $26 million in seed funding to accelerate the commercialisation of its photonic processor, codenamed “JEF”. At the core of “JEF” is a proprietary photonic technology that processes data using lasers instead of transistors. By using photons, light particles that generate much less heat than electrons, this chip can deliver the same performance as top GPUs while consuming 10× less …

Can Laser Resonances Have Irregularities in Oscillations?
Anjali Khandpal, Akanksha Prakash Patil, Tanishi Anil Shukla, Soumyajit Seth
https://arxiv.org/abs/2506.15371

Can Laser Resonances Have Irregularities in Oscillations?
Laser resonances play a crucial role in optical and quantum systems because the photons impact the stability and coherence of laser sources. While laser oscillations are typically stable and periodic, the presence of nonlinear effects can introduce irregular dynamical behaviors. This study explores whether laser resonances can exhibit such irregular oscillations by drawing an analogy to the classical and quantum Van der Pol oscillators. The Van der Pol model, known for its self-sustained oscill…

Spin Systems Coupled to Photons: A Case study of Phase Transition in a One-Dimensional Classical Ferromagnetic Ising Spin Chain at Finite Temperature
Shuntaro Otake, Motoaki Bamba
https://arxiv.org/abs/2507.01486

Spin Systems Coupled to Photons: A Case study of Phase Transition in a One-Dimensional Classical Ferromagnetic Ising Spin Chain at Finite Temperature
Although one-dimensional classical spin chains do not exhibit phase transitions, we found that a phase transition does occur when they are coupled to a cavity photon mode. This provides one of the simplest examples demonstrating that finite-temperature superradiant phase transitions can emerge from long-range fully connected interactions mediated by photons and interactions within the material.

Studying Maximal Entanglement and Bell Nonlocality at an Electron-Ion Collider
Wei Qi, Zijing Guo, Bo-Wen Xiao
https://arxiv.org/abs/2506.12889 https://

Studying Maximal Entanglement and Bell Nonlocality at an Electron-Ion Collider
In this paper, we propose to test quantum entanglement and Bell nonlocality at an Electron-Ion Collider (EIC). By computing the spin correlations in quark-antiquark pairs produced via photon-gluon fusion, we find that longitudinally polarized photons produce maximal entanglement at leading order, while transversely polarized photons generate significant entanglement near the threshold and in the ultra-relativistic regime. Compared to hadron colliders, the EIC provides a cleaner experimental env…

Cosmic filaments confirm unexplained cooling of CMB photons in two independent redshift ranges
Juan Ignacio Dom\'inguez Feldman, Luis A. Pereyra, Frode K. Hansen, Facundo Toscano, Diego Garcia Lambas
https://arxiv.org/abs/2506.08833

Cosmic filaments confirm unexplained cooling of CMB photons in two independent redshift ranges
Recent papers have reported an unexplained cooling of CMB photons passing through galaxies in nearby cosmic filaments $z<0.02$ at the $>5σ$ level. Here we show for the first time that this effect is also present at higher redshifts $0.02

Secure Data Access in Cloud Environments Using Quantum Cryptography
S. Vasavi Venkata Lakshmi, Ziaul Haque Choudhury
https://arxiv.org/abs/2506.10028 https…

Secure Data Access in Cloud Environments Using Quantum Cryptography
Cloud computing has made storing and accessing data easier but keeping it secure is a big challenge nowadays. Traditional methods of ensuring data may not be strong enough in the future when powerful quantum computers become available. To solve this problem, this study uses quantum cryptography to protect data in the cloud environment. Quantum Key Distribution (QKD) creates secure keys by sending information using quantum particles like photons. Specifically, we use the BB84 protocol, a simple …

Hybrid satellite-fiber quantum network
Yanxuan Shao, Saikat Guha, Adilson E. Motter
https://arxiv.org/abs/2507.12539 https://arxiv.or…

Hybrid satellite-fiber quantum network
Quantum networks hold promise for key distribution, private and distributed computing, and quantum sensing, among other applications. The scale of such networks for ground users is currently limited by one's ability to distribute entanglement between distant locations. This can in principle be carried out by transmitting entangled photons through optical fibers or satellites. The former is limited by fiber optic attenuation while the latter is limited by atmospheric extinction and diffraction. …

Artificial Gauge Fields and Dimensions in a Polariton Hofstadter Ladder
Simon Widmann, Jonas Bellmann, Johannes D\"ureth, Siddhartha Dam, Christian G. Mayer, Philipp Gagel, Simon Betzold, Monika Emmerling, Subhaskar Mandal, Rimi Banerjee, Timothy C. H. Liew, Ronny Thomale, Sven H\"ofling, Sebastian Klembt
https://arxiv…

Artificial Gauge Fields and Dimensions in a Polariton Hofstadter Ladder
Artificial gauge fields allow uncharged particles to mimic the behavior of charged particles subjected to magnetic fields, providing a powerful platform for exploring topological physics. Neutral particles, like photons, are typically unaffected by real magnetic fields. However, it is possible to introduce artificial gauge fields that control the effective dynamics of these neutral particles. Topological exciton-polariton lasers have attracted considerable interest, in part due to the wide rang…

Coherent superposition of emitted and resonantly scattered photons from a two-level system driven by an even-$\pi$ pulse
I. V. Krainov, A. I. Galimov, M. V. Rakhlin, A. A. Toropov, T. V. Shubina
https://arxiv.org/abs/2507.05943

Coherent superposition of emitted and resonantly scattered photons from a two-level system driven by an even-$π$ pulse
We report the observation of a bunching of ~3 photon states, which is a coherent superposition of emitted photons and resonantly scattered laser photons, arising upon excitation by even-$π$ pulses of a two-level system represented by a charged quantum dot in a microcavity. This phenomenon emerges because the exciting laser pulse contains several tens of photons whose quantum amplitude distribution creates such a superposition, and the polarization of the scattered photons is changed by the int…

Holography for QCD(Adj) and QCD(Adj) F
Anja Alfano, Nick Evans, Wanxiang Fan
https://arxiv.org/abs/2506.09456 https://arxiv.org/pdf/2…

Holography for QCD(Adj) and QCD(Adj)+F
We discuss confinement and chiral symmetry breaking in SU(Nc) gauge theories with fermions in the adjoint representation. There has been considerable work on studying these theories compactified on a small circle (with compactification scale 1/L large relative to the strong coupling scale of the theory). The weakly coupled IR theory of photons exhibits confinement through a density of magnetically charged instanton configurations. As the compactification scale 1/L approaches the strong coupling…

SPC to 3D: Novel View Synthesis from Binary SPC via I2I translation
Sumit Sharma, Gopi Raju Matta, Kaushik Mitra
https://arxiv.org/abs/2506.06890 https://

SPC to 3D: Novel View Synthesis from Binary SPC via I2I translation
Single Photon Avalanche Diodes (SPADs) represent a cutting-edge imaging technology, capable of detecting individual photons with remarkable timing precision. Building on this sensitivity, Single Photon Cameras (SPCs) enable image capture at exceptionally high speeds under both low and high illumination. Enabling 3D reconstruction and radiance field recovery from such SPC data holds significant promise. However, the binary nature of SPC images leads to severe information loss, particularly in te…

This https://arxiv.org/abs/2411.05175 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Quantum Imaging and Metrology with Undetected squeezed Photons: Noise Canceling and Noise Based Imaging
In this work a quantum imaging setup based on undetected squeezed photons is employed for metrological applications such as sensitive phase measurement and quantum imaging. In spite of the traditional quantum imaging with undetected photons, introduced by A. Zeilinger et. al, the proposed setup is equipped by a homodyne detection and also the brightness of the quantum light is enhanced by an optical parametric oscillator (OPO). Introducing OPO may be diminish the validity of the low gain approx…

Search for sub-GeV invisible particles in inclusive decays of $J/\psi$ to $\phi$
BESIII Collaboration, et al.
https://arxiv.org/abs/2506.10316 https://

Search for sub-GeV invisible particles in inclusive decays of $J/ψ$ to $ϕ$
A search for an invisible particle, $X$, with a mass between 0 and 0.96 $\textrm{GeV}/\textit{c}^{2}$, is performed in the process $J/ψ\rightarrowϕ+ X$ using $(8774.0\pm39.4)\times10^{6}$ $J/ψ$ events collected with the BESIII detector from 2017 to 2019. The $ϕ$ meson is fully reconstructed and an efficient veto of photons, neutral and charged hadrons up to twice the $K_L^0$ mass is applied to the rest of the events, and the recoil mass against the $ϕ$ is obtained precisely from the kinema…

Species-Dependent Electron Emission from Nanoparticles under Gamma Irradiation
Darukesha B H M
https://arxiv.org/abs/2507.11317 https://

Species-Dependent Electron Emission from Nanoparticles under Gamma Irradiation
In this study, various nanoparticle species-including Au and Gd$_2$O$_3$-were irradiated with low-energy gamma rays, such as 59.5 keV photons from $^{241}$Am. Pulse-height spectra were recorded using a liquid-scintillation counting system before and after dispersing the nanoparticles into the scintillator, and the differences between them were analyzed to infer the interaction outcomes. Gd$_2$O$_3$ nanoparticles emitted numerous electrons; however, under identical experimental conditions, no de…

GeV-scale thermal dark matter from dark photons: tightly constrained, yet allowed
D. Alonso-Gonz\'alez, D. Cerde\~no, P. Foldenauer, J. M. No
https://arxiv.org/abs/2507.11376 …

GeV-scale thermal dark matter from dark photons: tightly constrained, yet allowed
GeV-scale thermal dark matter (DM) is highly constrained by the null results of both direct and indirect detection experiments, especially in the context of simplified models. In this work, we study the interplay of collider, direct and indirect detection constraints on an extension of the dark Abelian Higgs model that includes a Dirac fermionic DM candidate, $χ$. We take into account in a consistent fashion the dilution of the indirect and direct detection signals when the relic abundance of …

Geodesics, Scalar Fields, and GUP-Corrected Thermodynamics of Charged BTZ-like Black Holes in Bopp-Podolsky Electrodynamics
Faizuddin Ahmed, Ahmad Al-Badawi, Abdelmalek Bouzenada, Erdem Sucu, \.Izzet Sakall{\i}
https://arxiv.org/abs/2507.10874

Geodesics, Scalar Fields, and GUP-Corrected Thermodynamics of Charged BTZ-like Black Holes in Bopp-Podolsky Electrodynamics
In Ref. [1], the spacetime geometry generated by compact objects in $(2+1)$-dimensional Bopp-Podolsky electrodynamics is derived. Using a perturbative approach, the authors derived a charged BTZ-like black hole solution and computed corrections up to second order in a perturbative expansion valid far from the horizon. In this work, we investigate the same circularly symmetric three-dimensional charged BH solution pierced by disclinations. We begin by analyzing the motion of photons within this …

Controllable Non-reciprocity in Multi-sphere Loaded Chiral Resonator
Maxime Ardisson, Guillaume Bourcin, Julien Haumant, Romain Lebrun, Isabella Boventer, Vincent Castel
https://arxiv.org/abs/2506.22230

Controllable Non-reciprocity in Multi-sphere Loaded Chiral Resonator
Cavity magnonics explores the hybridization of photons and magnons within microwave resonators. One of the hallmarks of these systems is their ability to exhibit non-reciprocity, which is a key feature for radio frequency (RF) applications. One way to control non-reciprocal behaviors in cavity magnonics is the design of chiral cavities that allow selective coupling between photons and magnons depending on their polarization. However, a built-in chiral platform to harness and control non-recipro…

Dark Matter Haloscope with a Disordered Dielectric Absorber
Stewart Koppell, Otavio D. A. R. Bittencourt, Dip Joti Paul, Junwu Huang, Masha Baryakhtar, Karl K. Berggren
https://arxiv.org/abs/2506.00115

Dark Matter Haloscope with a Disordered Dielectric Absorber
Light dark matter candidates such as axions and dark photons generically couple to electromagnetism, yielding dark-matter-to-photon conversion as a key search strategy. In addition to resonant conversion in cavities and circuits, light dark matter bosons efficiently convert to photons on material interfaces, with a broadband power proportional to the total area of these interfaces. In this work, we make use of interface conversion to develop a new experimental dark matter detector design: the d…

Where Photons Have Been: Nowhere Without All Components of Their Wavefunctions
R. E. Kastner
https://arxiv.org/abs/2507.06362 https://

Where Photons Have Been: Nowhere Without All Components of Their Wavefunctions
A nested interferometer experiment by Danan et al (2013) is discussed and some ontological implications explored, primarily in the context of time-symmetric interpretations of quantum theory. It is pointed out that photons are supported by all components of their wavefunctions, not selectively truncated "first order" portions of them, and that figures representing both a gap in the photon's path and signals from the cut-off path are incorrect. It is also noted that the Transactional Formulation…

Positron Signal from the Early Universe
L. Stodolsky, J. Silk
https://arxiv.org/abs/2506.10131 https://arxiv.org/pdf/2506.10131

Quantifying the Active Galactic Nuclei Fraction in Cosmic Voids via Mid-Infrared Variability
Anish S. Aradhey, Anca Constantin, Michael S. Vogeley, Kelly A. Douglass
https://arxiv.org/abs/2507.10921

Quantifying the Active Galactic Nuclei Fraction in Cosmic Voids via Mid-Infrared Variability
Observations and theoretical simulations suggest that the large scale environment plays a significant role in how galaxies form and evolve and, in particular, whether and when galaxies host an actively accreting supermassive black hole in their center (i.e., an Active Galactic Nucleus, or AGN). One signature of AGN activity is luminosity variability, which appears in the mid-infrared (mid-IR) when circumnuclear dust reprocesses UV and optical photons from the AGN accretion disk. We present here…

First systematic experimental 2D mapping of linearly polarized $\gamma$-ray polarimetric distribution in relativistic Compton scattering
Kaijie Chen, Xiangfei Wang, Hanghua Xu, Gongtao Fan, Zirui Hao, Longxiang Liu, Yue Zhang, Sheng Jin, Zhicai Li, Pu Jiao, Qiankun Sun, Zhenwei Wang, Mengdie Zhou, Mengke Xu, Hongwei Wang, Wenqing Shen, Yugang Ma
http…

First systematic experimental 2D mapping of linearly polarized $γ$-ray polarimetric distribution in relativistic Compton scattering
The interaction of photons with relativistic electrons constitutes a fundamental electromagnetic process whose polarization transfer mechanics remain incompletely characterized. We report the first systematic measurement of spatial polarization distribution for $γ$-rays generated via \SI{45}{\degree} slant inverse Compton scattering (ICS) between linearly polarized \SI{0.117}{\eV} photons and \SI{3.5}{\GeV} electrons, performing full 2D mapping of intensity, polarization angle (AOP), and degre…

Scrutinizing the cosmogenic origin of the KM3-230213A event: A Multimessenger Perspective
Alessandro Cermenati, Antonio Ambrosone, Roberto Aloisio, Denise Boncioli, Carmelo Evoli
https://arxiv.org/abs/2507.11993

Scrutinizing the cosmogenic origin of the KM3-230213A event: A Multimessenger Perspective
The recent detection of the neutrino event KM3-230213A ($\sim$~220 PeV) by the KM3NeT/ARCA telescope, the most energetic ever observed, could represent the long-awaited evidence for a cosmogenic origin, arising from the interaction of an ultra-high-energy cosmic ray with background photons. Its secure confirmation would mark a major advance in high-energy astrophysics. We perform a self-consistent multimessenger transport calculation of protons and their secondary $γ$-rays and neutrinos from c…

Dark states of electrons in a quantum system with two pairs of sublattices
Yoonah Chung, Minsu Kim, Yeryn Kim, Seyeong Cha, Joon Woo Park, Jeehong Park, Yeonjin Yi, Dongjoon Song, Jung Hyun Ryu, Kimoon Lee, Timur K. Kim, Cephise Cacho, Jonathan Denlinger, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, Keun Su Kim
https://arxiv.or…

Dark states of electrons in a quantum system with two pairs of sublattices
A quantum state of matter that is forbidden to interact with photons and is therefore undetectable by spectroscopic means is called a dark state. This basic concept can be applied to condensed matter where it suggests that a whole band of quantum states could be undetectable across a full Brillouin zone. Here we report the discovery of such condensed matter dark states in palladium diselenide as a model system that has two pairs of sublattices in the primitive cell. By using angle-resolved phot…

High brightness multi-MeV photon source driven by a petawatt-scale laser wakefield accelerator
E. Gerstmayr, B. Kettle, M. J. V. Streeter, L. Tudor, O. J. Finlay, L. E. Bradley, R. Fitzgarrald, T. Foster, P. Gellersen, A. E. Gunn, O. Lawrence, P. P. Rajeev, B. K. Russell, D. R. Symes, C. D. Murphy, A. G. R. Thomas, C. P. Ridgers, G. Sarri, S. P. D. Mangles

High brightness multi-MeV photon source driven by a petawatt-scale laser wakefield accelerator
We present an experimental demonstration of a bright multi-MeV gamma source driven by a petawatt laser. The source generates on average $(1.2\pm0.6)\times10^9$ photons above 1 MeV per pulse, exceeding those of previous all-optical sources by a hundred times, and reached a peak spectral brightness of $(3.9 \pm 1.5)\times 10^{22}$ photons/mm$^2$/mrad$^2$/s/0.1%BW at $ε_γ\approx11$ MeV. The source was produced by inverse Compton scattering of a laser wakefield accelerated GeV electron beam and i…

Magnetic Monopoles: Theoretical Insights into the Cosmic Ray Conundrum
{\L}ukasz Bratek, Joanna Ja{\l}ocha
https://arxiv.org/abs/2507.10765 https://…

Magnetic Monopoles: Theoretical Insights into the Cosmic Ray Conundrum
Ultra-high energy (UHE) photons above 10^{18} eV serve as valuable probes of fundamental physics. While typically produced in interactions involving charged particles, they could also originate from exotic sources such as annihilations of magnetically charged monopole-antimonopole pairs or decays of highly accelerated monopoles (10^{21} eV). Detecting such photons would impose constraints on monopole properties. Despite strong theoretical motivations and extensive experimental searches, no mono…

Enhancement of Indistinguishable Photon Emission from a GaAs Quantum Dot via Charge Noise Suppression
Priyabrata Mudi, Avijit Barua, Kartik Gaur, Steffen Wilksen, Alexander Steinhoff, Setthanat Wijitpatima, Sarthak Tripathi, Julian Ritzmann, Andreas D. Wieck, Sven Rodt, Christopher Gies, Arne Ludwig, Stephan Reitzenstein
https://

Enhancement of Indistinguishable Photon Emission from a GaAs Quantum Dot via Charge Noise Suppression
The generation of indistinguishable single photons is a fundamental requirement for future quantum technologies, particularly in quantum repeater networks and for distributed quantum computing based on entanglement distribution. However, spectral jitter, often induced by charge noise in epitaxial quantum dots, leads to exciton dephasing, thereby limiting their practical usage in quantum applications. We present a straightforward approach to mitigate charge noise-induced decoherence in droplet-e…

Observation of High-Order Quantum Pancharatnam-Berry Phase with Structured Photons
Shuang-Yin Huang, He Jiang, Zhi-Cheng Ren, Zi-Mo Cheng, Wen-Zheng Zhu, Jing Gao, Chang Liu, Xi-Lin Wang, Hui-Tian Wang
https://arxiv.org/abs/2506.10692

Observation of High-Order Quantum Pancharatnam-Berry Phase with Structured Photons
When a quantum system evolves so that it returns to its initial state, it will acquire a geometric phase acting as a memory of the transformation of a physical system, which has been experimentally measured in a variety of physical systems. In optics, the most prominent example is the Pancharatnam-Berry (PB) phase. Recent technological advances in phase and polarization structure have led to the discovery of high-order PB phases with structured light fields. The study on the high-order PB phase…

Generalised Aichelburg-Sexl and Self-Force for photons
Abedennour Dib, Aymeric Garnier, Alessandro Spallicci
https://arxiv.org/abs/2507.00767 https://

Generalised Aichelburg-Sexl and Self-Force for photons
We generalise the Aichelburg-Sexl Stress-Energy-Momentum tensor for massless particles to include motion with angular velocity, introducing tensorial spherical harmonics. Further, we make steps towards the concept of self-force for photons which could manifest as frequency shift.

Tuning the probability detection of OAM entangled photons in Helical Ince-Gauss modes
A. A. Aguilar-Cardoso, D. Rodriguez-Guillen, R. Ramirez-Alarcon
https://arxiv.org/abs/2507.07035

Tuning the probability detection of OAM entangled photons in Helical Ince-Gauss modes
In this work we provide a detailed theoretical and experimental analysis of the two-photon Orbital Angular Momentum (OAM) entangled state, generated by a type-I Spontaneous Parametric Down Conversion (SPDC) process, when decomposed in terms of the Helical Ince-Gauss (HIG) modes basis. By exploiting the unique characteristics of this modal basis we show how the probability detection of the photon-pair can be tuned with the ellipticity parameter of the modes. We also show that, on the HIG basis t…

QCD Axion Conversion in Magnetospheres of Neutron Stars
Shubham Yadav
https://arxiv.org/abs/2506.13310 https://arxiv.org/pdf/2506.133…

QCD Axion Conversion in Magnetospheres of Neutron Stars
The axion-converted-photons flux is a principal window for searching QCD axions as a dark matter (DM) candidate. In addition to solving the strong CP problem, these may explain the properties of the mysterious DM. Neutron star (NS) cooling by neutrino/axion emissions rate constrains the astrophysical properties of superdense matter. We attempt to analyse the impact of strong magnetic fields on the emission properties of NS by employing the FPS equation of State (EoS). We use the Tolman Oppenhei…

Evidence for a sign change of the ISW effect in the very recent universe: hot voids and cold overdensities at $z<0.03$
Frode K. Hansen, Diego Garcia Lambas, Andr\'es N. Ruiz, Facundo Toscano, Luis A. Pereyra
https://arxiv.org/abs/2506.08832

Evidence for a sign change of the ISW effect in the very recent universe: hot voids and cold overdensities at $z<0.03$
We find that CMB photons passing through local voids ($z<0.03$) are hotter than expected at the $2.7-3.6σ$ level. Combined with earlier findings showing a $>5σ$ cooling of CMB photons in galactic filaments in the same redshift range, we now have possible evidence for a negative Integrated Sachs-Wolfe (ISW) effect in the very recent universe. In addition to having opposite sign, the observed amplitude is an order of magnitude larger than the predicted Rees-Sciama and ISW effects for the nearby…

Ultra-High-Energy Transient Source Search using IceCube Neutrinos and Pierre Auger Photon Candidates
Maxwell Nakos (for the IceCube,Pierre Auger Collaborations)
https://arxiv.org/abs/2507.10994

Ultra-High-Energy Transient Source Search using IceCube Neutrinos and Pierre Auger Photon Candidates
The origins of ultra-high-energy particles remain one of the most profound mysteries in astrophysics. If nearby transient sources of ultra-high-energy particles exist, we might expect correlated emission of neutrinos and photons, arriving in close temporal and spatial coincidence. The IceCube Neutrino Observatory, located at the South Pole, is sensitive to neutrinos from TeV to EeV energies, while the Pierre Auger Observatory, in Argentina, detects cosmic rays and has the capability of observin…

Violation of Bell Inequality with Unentangled Photons
Kai Wang, Zhaohua Hou, Kaiyi Qian, Leizhen Chen, Mario Krenn, Markus Aspelmeyer, Anton Zeilinger, Shining Zhu, Xiao-Song Ma
https://arxiv.org/abs/2507.07756

Violation of Bell Inequality with Unentangled Photons
Violation of local realism via Bell inequality - a profound and counterintuitive manifestation of quantum theory that conflicts with the prediction of local realism - is viewed to be intimately linked with quantum entanglement. Experimental demonstrations of such a phenomenon using quantum entangled states are among the landmark experiments of modern physics and paved the way for quantum technology. Here we report the violation of the Bell inequality that cannot be described by quantum entangle…

Dark photon dark matter constraints and a tentative signal at the TASEH experiment
Yuan-Hann Chang, Cheng-Wei Chiang, Hien Thi Doan, Nick Houston, Jinmian Li, Tianjun Li, Lina Wu, Xin Zhang
https://arxiv.org/abs/2507.00784

Dark photon dark matter constraints and a tentative signal at the TASEH experiment
The dark photon is a well motivated candidate for the dark matter which comprises most of the mass of our visible Universe, leading to worldwide experimental and observational efforts towards its discovery. A primary tool in this search is the cavity haloscope, which facilitates resonantly enhanced conversion to photons from both dark photons and axions. In this context, limits from axion search experiments are often directly converted into dark photon constraints, without re-analyzing the orig…

Interplay of prompt and non-prompt photons in photon-triggered jet observables
Chathuranga Sirimanna (JETSCAPE Collaboration), Yasuki Tachibana (JETSCAPE Collaboration), Abhijit Majumder (JETSCAPE Collaboration), Aaron Angerami (JETSCAPE Collaboration), Ritu Arora (JETSCAPE Collaboration), Steffen Bass (JETSCAPE Collaboration), Yi Chen (JETSCAPE Collaboration), Ritoban Datta (JETSCAPE Collaboration), Lipei Du (JETSCAPE Collaboration), Raymond Ehlers (JETSCAPE Collaboration), Hannah Elf…

Interplay of prompt and non-prompt photons in photon-triggered jet observables
Prompt photons are important yet challenging to observe in relativistic heavy-ion collisions, as they are produced in the early stages and traverse almost the entire QGP medium without interaction. Experimental analyses typically employ isolation cuts, in the hope to identify prompt photons. Most theoretical studies consider only events with actual prompt photons, assuming no contribution from isolated non-prompt photons to reduce computational cost. For the first time, we present a study that …

High-Sensitivity Fiber Interferometer for Gravitational Phase Shift Measurement on Entangled States
Eleonora Polini, Piotr Chru\'sciel, Georgi Dvali, Christopher Hilweg, Beg\"um Kabag\"oz, Dorotea Macri, Thomas Mieling, Thomas Morling, Eric Oelker, Elisabeth Steininger, Xinghui Yin, Haocun Yu, Sebastian Zell, Tongxuan Zhang, Nergis Mavalvala, Philip Walther

High-Sensitivity Fiber Interferometer for Gravitational Phase Shift Measurement on Entangled States
In this contribution, we describe the status of our experiment aimed at measuring the gravitationally induced phase shift on path-entangled photons. We use a kilometer-scale fiber interferometer whose arms are vertically displaced in the Earth gravitational potential, allowing photons propagating at different heights to accumulate different phases. To date, this is the first experiment to measure this effect on massless particles, thereby experimentally combining general relativity and quantum …

Oscillations of hypothetical strange stars as an efficient source ultra-high-energy particles
Joanna Ja{\l}ocha, {\L}ukasz Bratek
https://arxiv.org/abs/2507.10617

Oscillations of hypothetical strange stars as an efficient source ultra-high-energy particles
We investigate the dynamical behavior of strange quark matter (SQM) objects, such as stars and planets, when subjected to radial oscillations induced by tidal interactions in stellar systems. Our study demonstrates that SQM objects can efficiently convert mechanical energy into hadronic energy due to the critical mass density at their surfaces of 4.7*10^{14} g/cm^3, below which SQM becomes unstable and decays into photons, hadrons, and leptons. We show that even small-amplitude radial oscillati…

Gravitational Photon Polarization Twist to Probe the Early Universe and the Galactic Center
Rodolfo Capdevilla
https://arxiv.org/abs/2507.05347 https://

Gravitational Photon Polarization Twist to Probe the Early Universe and the Galactic Center
It is known that gravitational wave backgrounds (GWBs) change the polarization state of photons. This letter explores the possibility of using this effect to detect GWBs. The proposed experiment features a vertically polarized laser pulse traveling through a GWB before reaching a birefringent material which separates photons by polarization. Photons that emerge the birefringent material horizontally polarized are counted as signal photons. A space-based setup of a million km (comparable to the …

Ants3 toolkit: front-end for Geant4 with interactive GUI and Python scripting
A. Morozov, L. M. S. Margato, G. Canezin, J. Gonzalez
https://arxiv.org/abs/2506.07922

Ants3 toolkit: front-end for Geant4 with interactive GUI and Python scripting
Ants3 is a toolkit that serves as a front-end for particle simulations in Geant4 and offers a custom simulator for optical photons. It features a fully interactive Graphical User Interface and an extensive scripting system based on general-purpose scripting languages (Python and JavaScript). Ants3 covers the entire detector simulation/optimization cycle, providing an intuitive approach for configuration of the geometry and simulation conditions, the possibility to automatically distribute workl…

This https://arxiv.org/abs/2505.00761 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

What is a photon in de Sitter spacetime?
The states of a single photon in four-dimensional de Sitter (dS) spacetime form a Unitary Irreducible Representation (UIR) of SO(1,4), which we call the photon UIR. While in flat spacetime photons are intimately tied to gauge symmetry, we demonstrate that in de Sitter, photon states emerge generically in any quantum field theory, even without an underlying U(1) gauge field. We derive a Källén-Lehmann representation for antisymmetric tensor two-point functions and show that numerous composite …

Integrated bright source of polarization-entangled photons using lithium niobate photonic chips
Changhyun Kim, Hansol Kim, Minho Choi, Junhyung Lee, Yongchan Park, Sunghyun Moon, Jinil Lee, Hyeon Hwang, Min-Kyo Seo, Yoon-Ho Kim, Yong-Su Kim, Hojoong Jung, Hyounghan Kwon
https://arxiv.org/abs/2506.23625

Integrated bright source of polarization-entangled photons using lithium niobate photonic chips
Quantum photonics has rapidly advanced as a key area for developing quantum technologies by harnessing photons' inherent quantum characteristics, particularly entanglement. Generation of entangled photon pairs, known as Bell states, is crucial for quantum communications, precision sensing, and quantum computing. While bulk quantum optical setups have provided foundational progress, integrated quantum photonic platforms now offer superior scalability, efficiency, and integrative potential. In th…

Breaking Through the Cosmic Fog: JWST/NIRSpec Constraints on Ionizing Photon Escape in Reionization-Era Galaxies
Emma Giovinazzo, Pascal A. Oesch, Andrea Weibel, Romain A. Meyer, Callum Witten, Aniket Bhagwat, Gabriel Brammer, John Chisholm, Anna de Graaff, Rashmi Gottumukkala, Michelle Jecmen, Harley Katz, Joel Leja, Rui Marques-Chaves, Michael Maseda, Irene Shivaei, Maxime Trebitsch, Anne Verhamme

Breaking Through the Cosmic Fog: JWST/NIRSpec Constraints on Ionizing Photon Escape in Reionization-Era Galaxies
The escape fraction of Lyman continuum photons (fesc(LyC)) is the last key unknown in our understanding of cosmic reionization. Directly estimating the escape fraction (fesc) of ionizing photons in the epoch of reionization (EoR) is impossible, due to the opacity of the intergalactic medium (IGM). However, a high fesc leaves clear imprints in the spectrum of a galaxy, due to reduced nebular line and continuum emission, which also leads to bluer UV continuum slopes (betaUV). Here, we exploit the…

Thermal Radiation from an Analytic Hydrodynamic Model with Hadronic and QGP Sources in Heavy-Ion Collisions
G\'abor L\'aszl\'o Kasza
https://arxiv.org/abs/2507.13240

Thermal Radiation from an Analytic Hydrodynamic Model with Hadronic and QGP Sources in Heavy-Ion Collisions
In high-energy heavy-ion collisions, a nearly perfect fluid is formed, known as the strongly coupled quark-gluon plasma (QGP). After a short thermalization period, the evolution of this medium can be described by the equations of relativistic hydrodynamics. As the system expands and cools, the QGP undergoes a transition into hadronic matter, marking the onset of quark confinement. Direct photons offer insights into an essential stage of evolution, spanning from the onset of thermalization to th…

Advanced techniques of searching for flares of ultra-high-energy photons from point sources
Jaroslaw Stasielak, Chaitanya Priyadarshi, Dariusz G\'ora, Nataliia Borodai, Marcus Niechciol, Jan P\k{e}kala
https://arxiv.org/abs/2507.02777

Advanced techniques of searching for flares of ultra-high-energy photons from point sources
Astrophysical flares are one of the possible prominent source classes of ultra-high-energy (UHE, $E > 10^{17}$ eV) cosmic rays, which can be detected by recording clusters of extensive air showers in arrays of detectors. The search for sources of neutral particles offers distinct advantages over searching for sources of charged particles, as the former traverse cosmic distances undeflected by magnetic fields. While no cosmic-ray photons exceeding $10^{17}$ eV have been definitively detected, id…

Enhancing Photon Indistinguishability of Spectrally Mismatched Single Photons by Cavity Floquet Engineering
J. W. Yu, X. Q. Zhou, Z. B. Ni, X. T. Cheng, Y. Zhao, H. H. Zhu, C. H. Li, F. Liu, C. Y. Jin
https://arxiv.org/abs/2507.02460

Enhancing Photon Indistinguishability of Spectrally Mismatched Single Photons by Cavity Floquet Engineering
We theoretically propose a scheme to enhance the photon indistinguishability of spectrally mismatched single photons via Floquet-engineered optical frequency combs (OFCs) in cavity quantum electrodynamic systems. By periodically modulating two distinct single-photon states under a modulation frequency which is exactly equal to the spectral mismatch of two cavity modes, a pair of single-photon frequency-comb (SPFC) states is prepared energy-conservatively based on full unitary operations. The tw…

Impact of Polarization Distinguishability on Coherence in QIUP
Gaytri Arya, Paolo Bianchini, Alberto Diaspro
https://arxiv.org/abs/2507.06879 https://

Impact of Polarization Distinguishability on Coherence in QIUP
Quantum imaging with undetected photons (QIUP) is a promising technique for non-invasive imaging, particularly at wavelengths where detectors are inefficient or unavailable. Recent studies have investigated the role of polarization in QIUP schemes. In this work, we examine whether post-generation optical elements can recover interference when the signal photons are distinguishable in polarization at the source. Specifically, we employ a Mach-Zehnder interferometer after the photon pairs are gen…

Search for an Anomalous Excess of Single Photons in the MicroBooNE Neutrino Experiment
Lee Hagaman
https://arxiv.org/abs/2506.18956 https://

Search for an Anomalous Excess of Single Photons in the MicroBooNE Neutrino Experiment
Neutrinos are some of the most elusive particles in the standard model, being incredibly common throughout the universe, but interacting with detectors incredibly rarely. Certain properties of neutrinos remain difficult to measure, including their masses, their CP violation properties, and whether or not they are their own antiparticles. Additionally, there have been several anomalous results in neutrino experiments which remain unexplained. MicroBooNE was built in order to study these anomalou…

Canonical Electrodynamics in Ashtekar-Barbero variables
Federica Fragomeno, Saeed Rastgoo
https://arxiv.org/abs/2507.06276 https://ar…

Canonical Electrodynamics in Ashtekar-Barbero variables
We present the full Hamiltonian analysis of electrodynamics, including fermions, photons, and their interaction, on a general curved spacetime in Ashtekar-Barbero variables. No gauge fixing is performed and the theory is background independent. The details of the constraints of the theory for both Weyl and Dirac fermions are presented. Moreover, the equations of motion are derived and it is shown that they reduce to the equations of motion of the standard QFT in curved or flat spacetime in the …

Hard bremsstrahlung for the production of prompt photons
A. A. Kampf (Lomonosov Moscow State University, Moscow, Russia, Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, Dubna, Russia)
https://arxiv.org/abs/2506.09700

Hard bremsstrahlung for the production of prompt photons
The analytical calculation of helicity amplitudes for hard photon and gluon bremsstrahlung radiation are described using the spinor formalism for processes of the type $\bar{q} q \to g γ$ and $q g \to q γ$. The presented amplitudes are expressed in terms of field strength bivectors, with allowance for the dependence on the helicities and masses of all particles. Numerical calculations have been performed for the quark-antiquark annihilation process $\bar{c}c$ at the center-of-mass energies of…

Constraints on primordial black holes from interstellar dust temperature in the Galaxy
A. N. Melikhov (P.N. Lebedev Physical Institute, Moscow, Russia), E. V. Mikheeva (Astro Space Center of the P.N. Lebedev Physical Institute, Moscow, Russia)
https://arxiv.org/abs/2506.08605

Constraints on primordial black holes from interstellar dust temperature in the Galaxy
The photons emitted by primordial black holes (PBHs) can be a heating factor for interstellar dust. Assuming that dust in the Galaxy has a homogeneous distribution and that PBHs have the same distribution as dark matter (DM), we constrain the fraction of PBHs in DM from the observational dust temperature in the Galaxy.

A broadband platform to search for hidden photons
Daqing Liu, Bin Tang, Xingfang Jiang, Xianyun Liu, Ning Ma
https://arxiv.org/abs/2506.19449 https://

A broadband platform to search for hidden photons
The optical behavior of a structure consisting of graphene sheets embedded in media was studied, and the differences between the structure and ordinary birefringent crystal, double zero-reflectance point, were identified. We showed the changes in the optical behavior of the structure due to the existence of hidden photons. When a radiation illuminates the structure, only $ω^2/ω_p^2>1+\frac{m_X^2 c^4 χ^2}{ε_r\hbar^2ω_p^2}$ can propagate through the structure. This provides a broadband platf…

Design Tradeoffs in Photonically Linked Qubit Networks
Ely Novakoski, Jungsang Kim
https://arxiv.org/abs/2506.06268 https://arxiv.org…

Design Tradeoffs in Photonically Linked Qubit Networks
Quantum networking can be realized by distributing pairs of entangled qubits between remote quantum processing nodes. Devoted communication qubits within each node can naturally interface with photons which bus quantum information between nodes. With the introduction of CQED to enhance interactions between communication qubits and photons, advanced protocols capable of achieving high entanglement distribution rates with high fidelity become feasible. In this paper, we consider two such protocol…

GNHeII J1236 6215: A He II $\lambda$1640 emitting and potentially LyC leaking galaxy at $z$ = 2.9803 unveiled through JWST & Keck observations
Chayan Mondal, Kanak Saha, Anshuman Borgohain, Brent M. Smith, Rogier A. Windhorst, Naveen Reddy, Chian-Chou Chen, Keiichi Umetsu, Rolf A. Jansen
https://arxiv.org/abs/2506.06831

GNHeII J1236+6215: A He II $λ$1640 emitting and potentially LyC leaking galaxy at $z$ = 2.9803 unveiled through JWST & Keck observations
He II $λ$1640 emission in galaxies indicates the presence of sources that produce extreme ionizing photons. Here, we report the discovery of a He II $λ$1640 emitting galaxy, GNHeII J1236+6215, at $z=$ 2.9803 in the GOODS-north field. We use photometry in 17 wavebands from near-UV to infrared to characterize the galaxy SED and combine Keck LRIS and JWST NIRSpec spectra to identify 15 emission lines including He II $λ$1640. We infer that the He$^+$ ionization in the galaxy could be driven by s…

Measuring the Astrophysical Galactic Plane Neutrino Flux and Searching for Galactic PeVatrons using the IceCube Multi-Flavor Astrophysical Neutrino Sample
Matthias Thiesmeyer (for the IceCube Collaboration), Tianlu Yuan (for the IceCube Collaboration), Leo Seen (for the IceCube Collaboration), Lu Lu (for the IceCube Collaboration), Albrecht Karle (for the IceCube Collaboration)

Measuring the Astrophysical Galactic Plane Neutrino Flux and Searching for Galactic PeVatrons using the IceCube Multi-Flavor Astrophysical Neutrino Sample
The IceCube Neutrino Observatory has provided new insights into the high-energy universe, in particular, unveiling neutrinos from the galactic plane. However, galactic neutrino sources are still unresolved. The recent detection of multi-PeV photons by LHAASO from the Cygnus region highlights its potential as a galactic neutrino source. Additionally, LHAASO, HAWC, and HESS have reported over forty galactic gamma-ray sources with energies above 100 TeV. Detecting neutrinos correlated with high-en…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[2/2]:
- Generalised Aichelburg-Sexl and Self-Force for photons
Abedennour Dib, Aymeric Garnier, Alessandro Spallicci

Engineering Magnetization with Photons: Nanoscale Advances in the Inverse Faraday Effect for Metallic and Plasmonic Systems
Chantal Hareau, Xingyu Yang, Maria Sanz, Matthew Sheldon, Mathieu Mivelle
https://arxiv.org/abs/2506.23515

Engineering Magnetization with Photons: Nanoscale Advances in the Inverse Faraday Effect for Metallic and Plasmonic Systems
The inverse Faraday effect, the ability of light to act as a source of magnetism, is a cornerstone of modern ultrafast optics. Harnessing this effect at the nanoscale promises to transform data storage and spintronics, yet its predictive understanding remains elusive. This review synthesizes recent progress in engineering the IFE within plasmonic architectures. We bridge the theoretical foundations, from classical drift current models to quantum descriptions, with the latest experimental milest…

Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons
Hendrik Rose, Stefan Schumacher, Torsten Meier
https://arxiv.org/abs/2506.22220

Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons
We present a microscopic and fully quantized model to investigate the interaction between semiconductor nanostructures and quantum light fields including the many-body Coloumb interaction between photoexcited electrons and holes. Our approach describes the coupled dynamics of the quantum light field and single and double electron-hole pairs, i.e., excitons and biexcitons, and exactly accounts for Coulomb many-body correlations and carrier band dispersions. Using a simplified yet exact approach,…

Exploring Topological Effects in Thin-Film X-Ray Cavities
Hanns Zimmermann, Jonathan Sturm, Ion Cosma Fulga, Jeroen van den Brink, Adriana P\`alffy
https://arxiv.org/abs/2506.10588

Exploring Topological Effects in Thin-Film X-Ray Cavities
Quantum control of single x-ray photons can be achieved using thin-film nanostructure cavities with embedded layers of resonant nuclei. Here, we design and theoretically investigate tailored cavity structures that implement a non-Hermitian version of the Su-Schrieffer-Heeger one-dimensional topological model. By tuning the geometry of the structure, different topological phases can be realized. We show that the presence of topological edge states can be identified in the reflectivity spectra of…

Experiments to test the hypothesis for solar and dark matter axions
Babette D\"obrich, Igor G. Irastorza
https://arxiv.org/abs/2507.06414 https://

Experiments to test the hypothesis for solar and dark matter axions
We present a pedagogical introduction to the direct search of axions as dark matter, as well as to searches for solar axions. The plethora of experimental searches exploit the axion's coupling to two photons: They attempt to convert the axion dark matter to photons in a resonator placed in an external magnetic field or convert solar axions into X-rays in a magnet pointing towards the sun. We give a basic introduction to this concept, its many variants and to searches that exploit the axion's ot…

X-ray linear polarization prediction in Black-Hole binaries and Active Galactic Nuclei and its measurements by IXPE
Lev Titarchuk, Paolo Soffitta, Elena Seifina, Fabio Muleri, Romana Mikusincova
https://arxiv.org/abs/2506.09571

X-ray linear polarization prediction in Black-Hole binaries and Active Galactic Nuclei and its measurements by IXPE
We present a theoretical framework for the formation of X-ray linear polarization in black hole (BH) source. The X-ray linear polarization originates from up-scatterings of initially soft photons within a hot, optically thick Compton cloud (CC) characterized by a flat geometry. The IXPE observations of several BHs X-ray binaries and of one Seyfert-1 galaxy confirm our theoretical prediction regarding values of the linear polarization P. The goal of this paper is to demonstrate that the main phy…

Smoking gun signature from axion and the constraints with radio telescopes
Zixuan Liu, Jiajun Zhang
https://arxiv.org/abs/2506.05795 https://

Smoking gun signature from axion and the constraints with radio telescopes
Axions are an elegant solution to the strong CP problem for particle physics and a promising dark matter candidate. They can convert into photons under a strong magnetic field, while magnetars with extreme magnetic fields are natural labs for axion detection. Radio telescopes can detect the radio emission from axion-photon conversion near magnetars. In this study, we have refined the calculation of axion-photon conversion and developed the matched filtering integration method to largely improve…

Efficient fiber coupling of telecom single-photons from circular Bragg gratings
Nam Tran, Pavel Ruchka, Sara Jakovljevic, Benjamin Breiholz, Peter Gier{\ss}, Ponraj Vijayan, Carlos Eduardo Jimenez, Alois Herkommer, Michael Jetter, Simone Luca Portalupi, Harald Giessen, Peter Michler
https://arxiv.org/abs/2506.01661

Efficient fiber coupling of telecom single-photons from circular Bragg gratings
Deterministic sources of quantum light are becoming increasingly relevant in the development of quantum communication, particularly in deployed fiber networks. Therefore, efficient fiber-coupled sources at telecom wavelength are highly sought after. With this goal in mind, we systematically investigate the fiber coupling performance of quantum dots in optical resonators under three experimental configurations. We quantify coupling efficiency and sensitivity to spatial displacement for single-mo…

Kerr nonlinearity, self-injection locking and correlation in a microresonator
Andrey Matsko, Abdelkrim El Amili, Lute Maleki
https://arxiv.org/abs/2506.09243

Kerr nonlinearity, self-injection locking and correlation in a microresonator
Production of entangled photon pairs is important in secure communication systems, quantum computing, and fundamental physics experiments. Achieving efficient generation of such photon pairs with low-loss parametric oscillators is a key objective in advancing integrated quantum technologies. However, spatially separating the generated photons while preserving their entanglement represents a significant technical challenge. In this work, we demonstrate nonlinear generation of correlated optical …

Cavity-mediated exciton hopping in a dielectrically engineered polariton system
Lukas Husel, Farsane Tabataba-Vakili, Johannes Scherzer, Lukas Krelle, Ismail Bilgin, Samarth Vadia, Kenji Watanabe, Takashi Taniguchi, Iacopo Carusotto, Alexander H\"ogele
https://arxiv.org/abs/2506.05561…

Cavity-mediated exciton hopping in a dielectrically engineered polariton system
Exciton-polaritons - coherently hybridized states of excitons and photons - are instrumental for solid-state nonlinear optics and quantum simulations. To enable engineered polariton energy landscapes and interactions, local control over the particle-like states can be achieved by tuning the properties of the exciton constituent. Monolayer transition metal dichalcogenides stand out in this respect, as they readily allow for a deterministic, flexible and scalable control of excitons, and thus of …

Toward graviton detection via photon-graviton quantum state conversion
Taiki Ikeda, Youka Kaku, Sugumi Kanno, Jiro Soda
https://arxiv.org/abs/2507.01609 ht…

Toward graviton detection via photon-graviton quantum state conversion
A magnetic field enables the interconversion of photons and gravitons, yet the process is usually analysed only at the level of classical wave equations. We revisit photon-graviton conversion in a quantum field theoretic framework, allowing us to track the evolution of arbitrary quantum states. Treating the photons as squeezed coherent states and the gravitons as the squeezed vacuum expected for primordial gravitational waves, we derive analytic expressions for the conversion probability and sh…

State of the Ice Model in the IceCube Observatory
Dmitry Chirkin (for the IceCube Collaboration), Martin Rongen (for the IceCube Collaboration)
https://arxiv.org/abs/2507.06341

State of the Ice Model in the IceCube Observatory
IceCube is a neutrino observatory located at the South Pole that uses Antarctic ice as a medium for detection of Cherenkov photons. As such, analysis of the data relies on our understanding of the properties of ice within and around the instrumented volume. Over the years we have made significant progress in understanding the glacial ice and now have a comprehensive model that covers many of the relevant aspects of the photon propagation in it. In this report we give a historical overview of th…

This https://arxiv.org/abs/2310.18397 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Detectable and defect-free dark photon dark matter
Ultralight dark photons are compelling dark matter candidates, but their allowed kinetic mixing with the Standard Model photon is severely constrained by requiring that the dark photons do not collapse into a cosmic string network in the early Universe. Direct detection in minimal production scenarios for dark photon dark matter is strongly limited, if not entirely excluded; discovery of sub-meV dark photon dark matter would therefore point to a nonminimal dark sector. We describe a model that …

Constraints on the Number of Primordial Black Holes Due to Interaction with Dust
A. N. Melikhov (Astro Space Center, P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia), E. V. Mikheeva (Astro Space Center, P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia)
https://arxiv.org/…

Constraints on the Number of Primordial Black Holes Due to Interaction with Dust
Photons emitted by primordial black holes (PBHs) due to the Hawking effect are among the factors of interstellar dust heating. Based on the data on the temperature of dust, constraints on the fraction of $10^{15}\leq M\leq10^{17}$~g.

Probing Strong-Field QED via Angle-Discriminated Emissions from Electrons Traversing Colliding Laser Pulses
C. Olofsson, A. Gonoskov
https://arxiv.org/abs/2506.08741

Probing Strong-Field QED via Angle-Discriminated Emissions from Electrons Traversing Colliding Laser Pulses
Future laser-electron colliders will reach quantum parameters $χ$ well in excess of unity, enabling studies of strong-field QED in extreme regimes. However, statistical inference in such experiments requires mitigating premature radiative losses of electrons to enable high-$χ$ QED events, as well as separating the detectable signal of these events from that of lower-$χ$ particles and photons produced by QED cascades. We propose a collider geometry in which electrons traverse the waist of two…

Generation of frequency entanglement by rotating Doppler effect
Bolong Yi, Ling Chen, Baocheng Zhang
https://arxiv.org/abs/2506.09488 https://

Generation of frequency entanglement by rotating Doppler effect
We propose a method to generate the frequency entanglement, allowing a continuous generation of entangled two-photon states in a hybrid degree of freedom by post-manipulation. Our method is based on type-II spontaneous parametric down-conversion in a nonlinear crystal and the rotation Doppler effect by rotating the q-plates, without preset discrete frequency entanglement. This allows the arbitrary modification of frequency entangled photons in a wide frequency range at room temperature, offerin…

Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
N. J. Martin, A. J. Brash, A. Tomlinson, E. M. Sala, E. O. Mills, C. L. Phillips, R. Dost, L. Hallacy, P. Millington-Hotze, D. Hallett, K. A. O'Flaherty, J. Heffernan, M. S. Skolnick, A. M Fox, L. R. Wilson
https://arxiv.org/abs/2506.07951…

Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
Telecom-wavelength quantum dots (QDs) are emerging as a promising solution for generating deterministic single-photons compatible with existing fiber-optic infrastructure. Emission in the low-loss C-band minimizes transmission losses, making them ideal for long-distance quantum communication. In this work, we present the first demonstration of both Stark tuning and charge state control of individual InAs/InP QDs operating within the telecom C-band. These QDs are grown by droplet epitaxy and emb…

Axion-like Particles and their Possible Impact on the Very High-Energy Spectrum of M87 Observed by LHAASO
A. Pratts, D Avila Rojas, J. Serna-Franco, M. M. Gonz\'alez, R. Alfaro
https://arxiv.org/abs/2507.05637

Axion-like Particles and their Possible Impact on the Very High-Energy Spectrum of M87 Observed by LHAASO
The detection of very high-energy (VHE) gamma rays from the active galaxy M87 by LHAASO, showing a possible spectral hardening around $20$ TeV, motivates the search for new physics beyond standard emission models. One promising candidate is axion-like particles (ALPs), hypothetical pseudo-scalar bosons that can oscillate into photons in the presence of cosmic magnetic fields. In this work, we investigate whether photon-ALP oscillations and an additional ALP-induced component can account for the…

Controlling quantum entanglement with classical non-separable light
R. F. Barros, A. L. S. Santos Junior, A. Z. Khoury, R. Fickler
https://arxiv.org/abs/2507.06462

Controlling quantum entanglement with classical non-separable light
Here we investigate the quantum frequency conversion of entangled photons driven by a classically non-separable laser beam. We show that the frequency conversion dynamics is described by a quantum channel that stems from the classical drive field through the channel-state duality - the quantum channel is dual to the classical coherence matrix of the drive field. This implies that the evolution of entanglement in the conversion process is bound by the classical non-separability of the drive fiel…

Resonance fluorescence and indistinguishable photons from a coherently driven B centre in hBN
Domitille G\'erard, St\'ephanie Buil, Kenji Watanabe, Takashi Taniguchi, Jean-Pierre Hermier, Aymeric Delteil
https://arxiv.org/abs/2506.16980

Resonance fluorescence and indistinguishable photons from a coherently driven B centre in hBN
Optically active defects in hexagonal boron nitride (hBN) have become amongst the most attractive single-photon emitters in the solid state, owing to their high-quality photophysical properties, combined with the unlimited possibilities of integration offered by the host two-dimensional material. In particular, the B centres, with their narrow linewidth, low wavelength spread and controllable positioning, have raised a particular interest for integrated quantum photonics. However, to date, eith…

Constraints on Axion-Like Particles from 16.5 Years of Fermi-LAT Data and Prospects for VLAST
Zhi-Qi Guo, Yue-Lin Sming Tsai, Lei Wu, Zi-Qing Xia
https://arxiv.org/abs/2507.07786 …

Constraints on Axion-Like Particles from 16.5 Years of Fermi-LAT Data and Prospects for VLAST
Axion-like particles (ALPs), hypothetical particles beyond the Standard Model, are considered as promising dark matter candidates. ALPs can convert into photons and vice versa in a magnetic field via the Primakoff effect, potentially generating detectable oscillation in $γ$-ray spectra. This study analyzes 16.5 years of data from the Fermi Large Area Telescope (Fermi-LAT) on NGC 1275, the brightest galaxy in the Perseus cluster, to constrain the ALP parameter space. Our results improve the pre…

Asymmetric two-photon response of an incoherently driven quantum emitter
Lennart Jehle, Lena M. Hansen, Patrik I. Sund, Thomas W. Sand{\o}, Raphael Joos, Michael Jetter, Simone L. Portalupi, Mathieu Bozzio, Peter Michler, Philip Walther
https://arxiv.org/abs/2507.07082

Asymmetric two-photon response of an incoherently driven quantum emitter
Quantum emitters promise to emit exactly one photon with high probability when pumped by a laser pulse. However, even in ideal systems, re-excitation during a laser pulse causes the consecutive emission of two photons, thus limiting the single-photon purity. Although the probability and properties of re-excitation are largely determined by the optical excitation method, until now only resonant driving has been studied. Here, we demonstrate qualitative differences in the process arising from pho…

Noise-tolerant tomography of multimode linear optical interferometers with single photons
Yu. A. Biriukov, R. D. Morozov, I. V. Dyakonov, M. V. Rakhlin, A. I. Galimov, G. V. Klimko, S. V. Sorokin, I. V. Sedova, M. M. Kulagina, Yu. M. Zadiranov, A. A. Toropov, A. A. Korneev, S. P. Kulik, S. S. Straupe
https://arxiv.org/abs/2506.2…

Noise-tolerant tomography of multimode linear optical interferometers with single photons
Linear optical networks are fundamental to the advancement of quantum technologies, including quantum computing, communication, and sensing. The accurate characterization of these networks, described by unitary matrices, is crucial to their effective utilization and scalability. In this work, we present the method for reconstructing the transfer matrix of a linear optical interferometer based on the analysis of cross-correlation functions of photon counts between pairs of output modes. Our appr…

An optical frequency shifter based on continuous-wave pump fields
Anica Hamer, Frank Vewinger, Michael H. Frosz, Simon Stellmer
https://arxiv.org/abs/2506.05989

An optical frequency shifter based on continuous-wave pump fields
Practical implementations of quantum information networks require frequency conversion of individual photons. Approaches based on a molecular gas as the nonlinear medium cover a wide range of the optical spectrum and promise high efficiency at negligible background. We present polarization-preserving frequency conversion in a hydrogen-loaded hollow core fiber using continuous-wave pump fields. We demonstrate conversion efficiency at the level of a few per mille, discuss various limitations and …

Dark Matter Haloscope with a Disordered Dielectric Absorber
Stewart Koppell, Otavio D. A. R. Bittencourt, Dip Joti Paul, Junwu Huang, Masha Baryakhtar, Karl K. Berggren
https://arxiv.org/abs/2506.00115

Dark Matter Haloscope with a Disordered Dielectric Absorber
Light dark matter candidates such as axions and dark photons generically couple to electromagnetism, yielding dark-matter-to-photon conversion as a key search strategy. In addition to resonant conversion in cavities and circuits, light dark matter bosons efficiently convert to photons on material interfaces, with a broadband power proportional to the total area of these interfaces. In this work, we make use of interface conversion to develop a new experimental dark matter detector design: the d…

Counter-propagating spontaneous parametric down-conversion source in lithium niobate on insulator
Jost Kellner, Alessandra Sabatti, Tristan Kuttner, Robert J. Chapman, Rachel Grange
https://arxiv.org/abs/2506.21396

Counter-propagating spontaneous parametric down-conversion source in lithium niobate on insulator
Quantum photonic technologies rely on the ability to generate, manipulate, and interfere indistinguishable single photons on a scalable platform. Among the various approaches, spontaneous parametric down-conversion (SPDC) remains one of the most widely used methods for generating entangled or pure photon pairs. However most integrated SPDC sources relying on co-propagating geometries have a limited purity of heralded photons, or require lossy filtering. Type-2 SPDC processes can produce pure se…

Theory Framework of Multiplexed Photon-Number-Resolving Detectors
Xiaobin Zhao, Hezheng Qin, Hong X. Tang, Linran Fan, Quntao Zhuang
https://arxiv.org/abs/2507.05554

Theory Framework of Multiplexed Photon-Number-Resolving Detectors
Photon counting is a fundamental component in quantum optics and quantum information. However, implementing ideal photon-number-resolving (PNR) detectors remains experimentally challenging. Multiplexed PNR detection offers a scalable and practical alternative by distributing photons across multiple modes and detecting their presence using simple ON-OFF detectors, thereby enabling approximate photon-number resolution. In this work, we establish a theoretical model for such detectors and prove th…

Cavity quantum electrodynamics on a nanocapillay fiber using a composite photonic crystal symmetric cavity
Srinu Gadde, Jelba John, Elaganuru Bashaiah, Ramachandrarao Yalla
https://arxiv.org/abs/2507.05804

Cavity quantum electrodynamics on a nanocapillay fiber using a composite photonic crystal symmetric cavity
We report the cavity quantum electrodynamics conditions using a composite photonic crystal symmetric cavity (CPCSC) on an optical nanocapillary fiber (NCF). The CPCSC is formed by combining the NCF and the symmetric defect mode nano-grating. The maximum channeling efficiency up to 87% is realized by placing the single quantum emitter at the anti-node position of the CPCSC. The current platform paves the way for manipulating single photons with applications in quantum technology.

This https://arxiv.org/abs/2505.20108 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Classical-to-quantum transfer of geometric phase for non-interferometric phase measurement and manipulation of quantum state
The geometric phase, originating from the cyclic evolution of a state, such as polarization on the Poincaré sphere, is typically measured through interferometric approaches that often include unwanted contributions from the dynamic phase. Here, we present a non-interferometric technique based on quantum correlation of pair photons to measure the geometric phase of a classical beam. The transfer of geometric phase of the classical pump beam arising from the cyclic evolution of its polarization …

Automated Polarization Basis Adjustment and Security Monitoring in Quantum Communication via Coincidence Entropies
Tom\'a\v{s} Nov\'ak, Carlos Guerra-Y\'anez, Mat\v{e}j Holubi\v{c}ka, Josef Vojt\v{e}ch, Josef Bla\v{z}ej
https://arxiv.org/abs/2505.24071

Automated Polarization Basis Adjustment and Security Monitoring in Quantum Communication via Coincidence Entropies
Polarization-sensitive receivers for single photons are of crucial importance in various applications within the fields of quantum communication and quantum sensing, and are more commonly implemented in free-space optics rather than in optical fibers. This is primarily due to the unpredictable and varying birefringence in single-mode optical fibers. We present a method for birefringence compensation in an all-fiber detection setup that relies solely on coincidence measurements of a polarization…