Tootfinder

Electrically pumped ultrabright entangled photons on chip
Xu-Feng Jiao, Ming-Yang Zheng, Yi-Hang Chen, Bo Cao, Xina Wang, Yang Liu, Cheng-Ao Yang, Xiu-Ping Xie, Chao-Yang Lu, Zhi-Chuan Niu, Qiang Zhang, Jian-Wei Pan
https://arxiv.org/abs/2508.14566

Electrically pumped ultrabright entangled photons on chip
Entangled photon sources (EPS) are essential for quantum science and technology. Despite advancements in integrated optical platforms like thin-film lithium niobate, a scalable, high-performance, chip-scale EPS has remained elusive. We address this by demonstrating an electrically pumped, post-selection-free polarization-EPS, achieved through hybrid integration of a distributed feedback laser with thin-film lithium niobate chip which integrates periodically poled lithium niobate waveguides, bea…

Multi-player conflict avoidance through entangled quantum walks
Honoka Shiratori, Tomoki Yamagami, Etsuo Segawa, Takatomo Mihana, Andr\'e R\"ohm, Ryoichi Horisaki
https://arxiv.org/abs/2508.14456

Multi-player conflict avoidance through entangled quantum walks
Quantum computing has the potential to solve complex problems faster and more efficiently than classical computing. It can achieve speedups by leveraging quantum phenomena like superposition, entanglement, and tunneling. Quantum walks (QWs) form the foundation for many quantum algorithms. Unlike classical random walks, QWs exhibit quantum interference, leading to unique behaviors such as linear spreading and localization. These properties make QWs valuable for various applications, including un…

Disentangling concept semantics via multilingual averaging in Sparse Autoencoders
Cliff O'Reilly, Ernesto Jimenez-Ruiz, Tillman Weyde
https://arxiv.org/abs/2508.14275 https:…

Disentangling concept semantics via multilingual averaging in Sparse Autoencoders
Connecting LLMs with formal knowledge representation and reasoning is a promising approach to address their shortcomings. Embeddings and sparse autoencoders are widely used to represent textual content, but the semantics are entangled with syntactic and language-specific information. We propose a method that isolates concept semantics in Large Langue Models by averaging concept activations derived via Sparse Autoencoders. We create English text representations from OWL ontology classes, transla…

Quantum-entangled B mesons and CP violation: a brief overview
Zhi-zhong Xing
https://arxiv.org/abs/2508.12589 https://arxiv.org/pdf/2508.12589

Quantum-entangled B mesons and CP violation: a brief overview
This paper is intended to provide a brief overview of the quantum-entangled production of neutral meson-antimeson pairs, and to highlight the first discovery of a clean physical CP-violating phase in coherent neutral-$B$ decays as a smoking gun of the Kobayashi-Maskawa mechanism of CP violation in the standard model of particle physics.

Gaussian fermionic embezzlement of entanglement
Alessia Kera, Lauritz van Luijk, Alexander Stottmeister, Henrik Wilming
https://arxiv.org/abs/2509.15749 https://

Gaussian fermionic embezzlement of entanglement
Embezzlement of entanglement allows to extract arbitrary entangled states from a suitable embezzling state using only local operations while perturbing the resource state arbitrarily little. A natural family of embezzling states is given by ground states of non-interacting, critical fermions in one spatial dimension. This raises the question of whether the embezzlement operations can be restricted to Gaussian operations whenever one only wishes to extract Gaussian entangled states. We show that…

Hypergraph modelling of wave scattering to speed-up material design
Kunwoo Park, Ikbeom Lee, Seungmok Youn, Gitae Lee, Namkyoo Park, Sunkyu Yu
https://arxiv.org/abs/2507.15329

Hypergraph modelling of wave scattering to speed-up material design
Hypergraphs offer a generalized framework for understanding complex systems, covering group interactions of different orders beyond traditional pairwise interactions. This modelling allows for the simplified description of simultaneous interactions among multiple elements in coupled oscillators, graph neural networks, and entangled qubits. Here, we employ this generalized framework to describe wave-matter interactions for material design acceleration. By devising the set operations for multipar…

Mitigating Cross-Image Information Leakage in LVLMs for Multi-Image Tasks
Yeji Park, Minyoung Lee, Sanghyuk Chun, Junsuk Choe
https://arxiv.org/abs/2508.13744 https://

Mitigating Cross-Image Information Leakage in LVLMs for Multi-Image Tasks
Large Vision-Language Models (LVLMs) demonstrate strong performance on single-image tasks. However, we observe that their performance degrades significantly when handling multi-image inputs. This occurs because visual cues from different images become entangled in the model's output. We refer to this phenomenon as cross-image information leakage. To address this issue, we propose FOCUS, a training-free and architecture-agnostic decoding strategy that mitigates cross-image information leakage du…

There may be an $n$-entangled set but no $n 1$-entangled sets
Jorge Antonio Cruz Chapital
https://arxiv.org/abs/2509.01029 https://arxiv.org/pdf/2509.01029…

There may be an $n$-entangled set but no $n+1$-entangled sets
In this paper we show that for every $2\leq n\in \mathbb{N}$, the statement "there is an $n$-entangled set, but there are no $n+1$-entangled sets" is consistent. We also prove some theorems which improve our understanding of entangled sets in relation to construction schemes: (1) The axiom FCA$^Δ$ introduced in \cite{finitizationclubch} implies the existence of $n$-entangled sets which are not $n+1$-entangled. (2) $\mathfrak{m}_\mathcal{F}>ω_1$ implies the non-existence of entangled sets. Thu…

Quantum state engineering of maximally entangled photon pairs by path identity
Richard Bernecker, Baghdasar Baghdasaryan, Stephan Fritzsche
https://arxiv.org/abs/2508.13638 http…

Quantum state engineering of maximally entangled photon pairs by path identity
Cutting-edge quantum technologies lean on sources of high-dimensional entangled states (HDES) that reliably prepare high-fidelity target states. The idea to overlap photon paths from distinct but indistinguishable sources was recently introduced for the creation of HDES, known as entanglement by path identity. In this regard, the use of orbital angular momentum (OAM) modes is promising, as they offer a high-dimensional and discrete Hilbert space to encode information. While entanglement by path…

💯 Scientists produce quantum entanglement-like results without entangled particles in new experiment
https://phys.org/news/2025-08-scientists-quantum-entanglement-results-entangled.html

Scientists produce quantum entanglement-like results without entangled particles in new experiment
In the everyday world that humans experience, objects behave in a predictable way, explained by classical physics. One of the important aspects of classical physics is that nothing, not even information, can travel faster than the speed of light. However, in the 1930s, scientists discovered that very small particles abide by some very different rules. One of the most mind-boggling behaviors exhibited by these particles is quantum entanglement—which Albert Einstein famously called "spooky acti…

Day 24: Yvonne Adhiambra Owuor
Owuor wrote "Dust", a novel that follows a scattered family's struggles with intergenerational trauma through a vivid tapestry of Kenyan history. Not only is it full of carefully rendered complex characters who both deal with their own issues and who are entangled in larger threads, but it also depicts a series of deeply personal reactions to and interactions with historical moments that give a gestalt sense of the painful history of Kenya both during and after the colonial era.
It's a gripping read despite not having a traditional suspense structure, where in the last third of the book every chapter seems to be tying up one more loose thread you had almost forgotten about, only to leave a little more still to discover, right up to the end. Owuor's skill at constructing such a detailed and complex plot and especially in navigating it to a satisfying conclusion is impressive, and her depictions of human foibles and struggles in the face of grief and not-wanting-to-know are relatable.
CW for domestic abuse, state murder, genocide, torture, etc.
#30AuthorsNoMen

Towards a holographic description of closed universes
Hong Liu
https://arxiv.org/abs/2509.14327 https://arxiv.org/pdf/2509.14327

Towards a holographic description of closed universes
We study baby closed universes in AdS, focusing on the Antonini-Sasieta-Swingle (AS$^2$) cosmology, which arises in the gravitational description of partially entangled thermal states (PETS), as well as the classical example of Maldacena-Maoz (MM). We show that the algebraic formulation of AdS/CFT--and in particular the subregion-subalgebra duality--provides a natural framework for describing such universes within the standard AdS/CFT setting, phrased in terms of an operator algebra ${\cal M}$ …

On the Speed-up of Wave-like Dark Matter Searches with Entangled Qubits
Arushi Bodas, Sohitri Ghosh, Roni Harnik
https://arxiv.org/abs/2510.11795 https://a…

On the Speed-up of Wave-like Dark Matter Searches with Entangled Qubits
Qubit-based sensing platforms offer promising new directions for wave-like dark matter searches. Recent proposals demonstrate that entangled qubits can achieve quadratic scaling of the signal in the number of qubits. In this work we expand on these proposals to analyze the bandwidth and scan rate performance of entangled qubit protocols across different error regimes. We find that the phase-based readout of entangled protocols preserves the search bandwidth independent of qubit number, in contr…

Gauging the variational optimization of projected entangled-pair states
Wei Tang, Laurens Vanderstraeten, Jutho Haegeman
https://arxiv.org/abs/2508.10822 https://

Gauging the variational optimization of projected entangled-pair states
Projected entangled-pair states (PEPS) constitute a powerful variational ansatz for capturing ground state physics of two-dimensional quantum systems. However, accurately computing and minimizing the energy expectation value remains challenging, in part because the impact of the gauge degrees of freedom that are present in the tensor network representation is poorly understood. We analyze the role of gauge transformations for the case of a U(1)-symmetric PEPS with point group symmetry, thereby …

Combined effects of particle geometry and applied vibrations on the mechanics and strength of entangled materials
Saeed Pezeshki, Francois Barthelat
https://arxiv.org/abs/2510.09933

Combined effects of particle geometry and applied vibrations on the mechanics and strength of entangled materials
Entangled materials offer attractive structural features including tensile strength and large deformations, combined with infinite assembly and disassembly capabilities. How the geometry of individual particles governs entanglement, and in turn translates into macroscopic structural properties, provides a rich landscape in terms of mechanics and offers intriguing possibilities in terms of structural design. Despite this potential, there are major knowledge gaps on the entanglement mechanisms an…

Can Hawking effect of multipartite state protect quantum resources in Schwarzschild black hole?
Shu-Min Wu, Xiao-Wei Teng, Hui-Chen Yang, Rui-Yang Xu, P. H. M. Barros, H. A. S. Costa
https://arxiv.org/abs/2509.15002

Can Hawking effect of multipartite state protect quantum resources in Schwarzschild black hole?
Most previous studies on relativistic quantum information have primarily focused on the vacuum state $|0\rangle$ and the first excited state $|1\rangle$ in two-mode entangled systems. In this work, we go beyond these limitations by considering arbitrary $q$-th excited states $|q\rangle$, aiming to investigate their role in preserving quantum resources. We analyze the influence of the Hawking effect on multipartite quantum states in the Schwarzschild spacetime, with particular att…

Non-Commutative weak measurements: Entanglement, Symmetry Breaking, and the Role of Readout
Yuanchen Zhao, Li Rao, Dong E. Liu
https://arxiv.org/abs/2508.15280 https://

Non-Commutative weak measurements: Entanglement, Symmetry Breaking, and the Role of Readout
The preparation of long-range entangled (LRE) states via quantum measurements is a promising strategy, yet its stability against realistic, non-commuting measurement noise remains a critical open question. Here, we systematically investigate the rich phase structure emerging from a minimal model of competing, non-commuting weak measurements: nearest-neighbor Ising ($Z_iZ_j$) and single-qubit transverse ($X_i$) operators. We analyze three experimentally relevant scenarios based on which measurem…

GazeDETR: Gaze Detection using Disentangled Head and Gaze Representations
Ryan Anthony Jalova de Belen, Gelareh Mohammadi, Arcot Sowmya
https://arxiv.org/abs/2508.12966 https://…

GazeDETR: Gaze Detection using Disentangled Head and Gaze Representations
Gaze communication plays a crucial role in daily social interactions. Quantifying this behavior can help in human-computer interaction and digital phenotyping. While end-to-end models exist for gaze target detection, they only utilize a single decoder to simultaneously localize human heads and predict their corresponding gaze (e.g., 2D points or heatmap) in a scene. This multitask learning approach generates a unified and entangled representation for human head localization and gaze location pr…

Waveguiding in two-dimensional Floquet non-Abelian topological insulators
Yujie Zhou, Changsen Li, Xiumei Wang, Xingping Zhou
https://arxiv.org/abs/2508.12678 https://

Waveguiding in two-dimensional Floquet non-Abelian topological insulators
Topological phases characterized by non-Abelian charges have garnered increasing attention recently. Although Floquet (periodic-driving) higher-order topological phases have been explored at the single-particle level, the role of interactions in non-Abelian topological insulators with multiple entangled energy gaps remains incompletely understood. In this work, we extend previous research by investigating higher-order topological phases featuring non-Abelian charges through Floquet engineering.…

“Against the Uncritical Adoption of 'AI' Technologies in Academia”
https://zenodo.org/records/17065099

Dispersion Relations in Two- and Three-Dimensional Quantum Systems
Valeriia Bilokon, Elvira Bilokon, Illya Lukin, Andrii Sotnikov, Denys Bondar
https://arxiv.org/abs/2509.15483 …

Dispersion Relations in Two- and Three-Dimensional Quantum Systems
Extracting momentum-resolved excitation spectra in strongly correlated quantum systems remains a major challenge, especially beyond one spatial dimension. We present an efficient tensor-network approach to compute dispersion relations via imaginary-time evolution within the infinite projected entangled-pair states (iPEPS) framework. Benchmarking on the transverse-field Ising model, the method successfully captures dispersion relations in both paramagnetic and ferromagnetic phases for two- and t…

Replaced article(s) found for cond-mat.other. https://arxiv.org/list/cond-mat.other/new
[1/1]:
- Synthetic and cosmological axion hybridization: entangled photons, (HBT) and quantum beats
Daniel Boyanovsky

Robust Self-Testing of Multiqudit Supersinglet Slater States via Constant Number of Binary Measurements
Arturo Konderak, Wojciech Bruzda, Remigiusz Augusiak
https://arxiv.org/abs/2508.15546

Robust Self-Testing of Multiqudit Supersinglet Slater States via Constant Number of Binary Measurements
Self-testing is a powerful device-independent technique that enables one to deduce the forms of both the quantum state and the measurements involved in a physical experiment based solely on observed correlations. Although numerous schemes for self-testing multipartite entangled states have been proposed, they are typically difficult to implement experimentally, as their complexity increases significantly with the number of subsystems or the local dimension. In this work, we introduce the first …

Determination of CKM matrix element and axial vector form factors from weak decays of quantum-entangled strange baryons
BESIII Collaboration, et al.
https://arxiv.org/abs/2509.09266

Determination of CKM matrix element and axial vector form factors from weak decays of quantum-entangled strange baryons
The electromagnetic structure of the nucleon can be determined from the scattering of electrons off a nucleon target. However, to study its axial structure, neutrino beams are required. The results from these experiments should be extrapolated to zero energy-momentum transfers to access the static properties of the nucleon. For baryons with strange quarks, hyperons, the static limit can instead be approached in semi-leptonic decays, which give direct access to the weak magnetism and axial-vecto…

Multi-Dimensional Photon-Correlations Reveal Triexciton Features in Single Perovskite Quantum Dots
Alex Hinkle, Chieh Tsao, Adam Duell, Hendrik Utzat
https://arxiv.org/abs/2509.12461

Multi-Dimensional Photon-Correlations Reveal Triexciton Features in Single Perovskite Quantum Dots
Lead-halide perovskite quantum dots (PQDs) are established quantum emitters with potential for entangled photon-pair generation via multiexciton cascades. However, the energetics and dynamics of many-body excitations remain poorly understood. Here, we perform time- and frequency-resolved photon-correlation spectroscopy of single CsPbBr\textsubscript{3} PQDs at low temperatures using a single-photon avalanche diode (SPAD) array detector. We report biexciton binding energies and assign their char…

Blocked yet another tech person I looked up to because they drank the AI scam cool-aid and are now hopelessly entangled in their web of lies.
The “arguments” these people have about why they’re supposedly right literally always boil down to “you’re not seeing the light” type of personal attacks.
It’s a cult, I don’t know what else to say.
Sad that more and more people fall for it.

Once ye hoist yer sails and plunder treasures from #Piracy

Detection of non-absolute separability in quantum states and channels through moments
Bivas Mallick, Saheli Mukherjee, Nirman Ganguly, A. S. Majumdar
https://arxiv.org/abs/2508.15700

Detection of non-absolute separability in quantum states and channels through moments
In quantum information and computation, generation of entanglement through unitary gates remains a significant and active area of research. However, there are states termed as absolutely separable, from which entanglement cannot be created through any non-local unitary action. Thus, from a resource-theoretic perspective, non-absolutely separable states are useful as they can be turned into entangled states using some appropriate unitary gates. In this work, we propose an efficient method to det…

Quantum Generative Adversarial Autoencoders: Learning latent representations for quantum data generation
Naipunnya Raj, Rajiv Sangle, Avinash Singh, Krishna Kumar Sabapathy
https://arxiv.org/abs/2509.16186

Quantum Generative Adversarial Autoencoders: Learning latent representations for quantum data generation
In this work, we introduce the Quantum Generative Adversarial Autoencoder (QGAA), a quantum model for generation of quantum data. The QGAA consists of two components: (a) Quantum Autoencoder (QAE) to compress quantum states, and (b) Quantum Generative Adversarial Network (QGAN) to learn the latent space of the trained QAE. This approach imparts the QAE with generative capabilities. The utility of QGAA is demonstrated in two representative scenarios: (a) generation of pure entangled states, and …

The Entangled Feedback Impacts of Supernovae in Coarse- versus High-Resolution Galaxy Simulations
Eric Zhang, Laura V. Sales, Thales A. Gutcke, Yunwei Deng, Hui Li, R\"udiger Pakmor, Federico Marinacci, Volker Springel, Mark Vogelsberger, Paul Torrey, Boyuan Liu, Rahul Kannan, Aaron Smith, Greg L. Bryan
https://arxiv.org/abs/2510.0243…

The Entangled Feedback Impacts of Supernovae in Coarse- versus High-Resolution Galaxy Simulations
It is often understood that supernova (SN) feedback in galaxies is responsible for regulating star formation and generating gaseous outflows. However, a detailed look at their effect on the local interstellar medium (ISM) on small mass scales in simulations shows that these processes proceed in clearly distinct channels. We demonstrate this finding in two independent simulations with solar-mass resolution, LYRA and RIGEL, of an isolated dwarf galaxy. Focusing on the immediate environment surrou…

Perturbation Self-Supervised Representations for Cross-Lingual Emotion TTS: Stage-Wise Modeling of Emotion and Speaker
Cheng Gong, Chunyu Qiang, Tianrui Wang, Yu Jiang, Yuheng Lu, Ruihao Jing, Xiaoxiao Miao, Xiaolei Zhang, Longbiao Wang, Jianwu Dang
https://arxiv.org/abs/2510.11124

Perturbation Self-Supervised Representations for Cross-Lingual Emotion TTS: Stage-Wise Modeling of Emotion and Speaker
Cross-lingual emotional text-to-speech (TTS) aims to produce speech in one language that captures the emotion of a speaker from another language while maintaining the target voice's timbre. This process of cross-lingual emotional speech synthesis presents a complex challenge, necessitating flexible control over emotion, timbre, and language. However, emotion and timbre are highly entangled in speech signals, making fine-grained control challenging. To address this issue, we propose EMM-TTS, a n…

Generation and certification of pure phase entangled light
Rounak Chatterjee, Mayuresh Kanagal, Vikas S Bhat, Kiran Bajar, Sushil Mujumdar
https://arxiv.org/abs/2508.11418 https…

Generation and certification of pure phase entangled light
Biphoton systems exhibiting entanglement in position-momentum variables, known as spatial entanglement, are among the most intriguing and well-studied phenomena in quantum optics. A notable subset of these are phase entangled states, where entanglement manifests purely through correlations in the spatial phase of the wavefunction. While the generation of such states from biphotons via spontaneous parametric down-conversion has been explored, their physical implications and applications remain u…

Primitive chain network simulations of the creep of entangled polymers
Yuichi Masubuchi, Giovanni Ianniruberto, Giuseppe Marrucci
https://arxiv.org/abs/2508.01526 https://

Primitive chain network simulations of the creep of entangled polymers
Although the behavior of entangled polymers in startup shear flows with constant shear rates has been thoroughly investigated, the response under creep has not been frequently considered. In this study, primitive chain network simulations, based on a multi-chain sliplink model, are modified so as to describe creep experiments. Creep simulations are compared to a literature dataset of an entangled polybutadiene solution, and qualitative agreement is found in the nonlinear range, i.e., under larg…

Quantum Gravity and Entanglement in Particle Physics and Gravitation
Nick E. Mavromatos
https://arxiv.org/abs/2508.08346 https://arxiv.org/pdf/2508.08346…

Quantum Gravity and Entanglement in Particle Physics and Gravitation
Some approaches to Quantum Gravity (QG) entail decoherence of quantum matter propagating in it, due to an ``environment'' of QG degrees of freedom inaccessible to low-energy observers. In the first part of this talk, I discuss potential, and rather unique, effects of QG-induced decoherence on entangled particle states, specifically an induced modification of Einstein-Podolsky-Rosen (EPR) correlations of entangled neutral-meson states in meson factories ($ω$-effect). In the second part, I summa…

Prospects for $P$ and $C\!P$ violation in $\Lambda_{c}^{ }$ decays with polarized beam at Super Tau-Charm Facility
Hong-Jian Wang, Cheng Wang, Hao Sun, Pei-Rong Li, Xiao-Rui Lyu, Rong-Gang Ping
https://arxiv.org/abs/2508.12217

Prospects for $P$ and $C\!P$ violation in $Λ_{c}^{+}$ decays with polarized beam at Super Tau-Charm Facility
Weak decays of the charmed baryons offer an ideal platform to study parity ($P$) and charge conjugation-parity ($C\!P$) violation in quark sector, to stringently test the Standard Model and search for new physics. It is a key goal in the next-generation positron-electron collider, such as the Super Tau-Charm Facility (STCF). Thanks to the quantum-entangled pair production with super high luminosity and the possibility of beam polarization, STCF provides a unique environment to probe such symmet…

ComoRAG: A Cognitive-Inspired Memory-Organized RAG for Stateful Long Narrative Reasoning
Juyuan Wang, Rongchen Zhao, Wei Wei, Yufeng Wang, Mo Yu, Jie Zhou, Jin Xu, Liyan Xu
https://arxiv.org/abs/2508.10419

ComoRAG: A Cognitive-Inspired Memory-Organized RAG for Stateful Long Narrative Reasoning
Narrative comprehension on long stories and novels has been a challenging domain attributed to their intricate plotlines and entangled, often evolving relations among characters and entities. Given the LLM's diminished reasoning over extended context and high computational cost, retrieval-based approaches remain a pivotal role in practice. However, traditional RAG methods can fall short due to their stateless, single-step retrieval process, which often overlooks the dynamic nature of capturing …

MMMS: Multi-Modal Multi-Surface Interactive Segmentation
Robin Sch\"on, Julian Lorenz, Katja Ludwig, Daniel Kienzle, Rainer Lienhart
https://arxiv.org/abs/2509.12963 https:…

MMMS: Multi-Modal Multi-Surface Interactive Segmentation
In this paper, we present a method to interactively create segmentation masks on the basis of user clicks. We pay particular attention to the segmentation of multiple surfaces that are simultaneously present in the same image. Since these surfaces may be heavily entangled and adjacent, we also present a novel extended evaluation metric that accounts for the challenges of this scenario. Additionally, the presented method is able to use multi-modal inputs to facilitate the segmentation task. At t…

Gapped spinful phases obtained via Gutzwiller projections of Euler states
Thorsten B. Wahl, Lukas Devos, Robert-Jan Slager
https://arxiv.org/abs/2508.10957 https://

Gapped spinful phases obtained via Gutzwiller projections of Euler states
Gutzwiller projections of non-interacting chiral topological phases are known to give rise to fractional, topologically ordered chiral phases. Here, we carry out a similar construction using two copies of non-interacting Euler insulators to produce a class of spinful interacting Euler models. To that end, we take advantage of the recently discovered exact representation of certain Euler insulators by a projected entangled pair state (PEPS) of bond dimension $D = 2$. The Gutzwiller projection ca…

Thin-film Al0.30Ga0.70As (111) as a flat source of high-purity orthogonally polarized entangled photons
Simon Stich, Vitaliy Sultanov, Trevor Blakie, Qingyu Shi, Zbig Wasiliewski, Mikhail A. Belkin, Maria Chekhova
https://arxiv.org/abs/2509.03978

Thin-film Al0.30Ga0.70As (111) as a flat source of high-purity orthogonally polarized entangled photons
Flat-optics platforms offer new opportunities for the generation of entangled photons by relaxing traditional phase-matching constraints, enabling the use of a broader range of nonlinear materials. Among these, gallium arsenide and aluminum gallium arsenide stand out for their exceptionally high second-order nonlinearities, but their conventional orientation (001) has limited their applicability for photon-pair generation. By transitioning to crystals with (111) surface orientation, we overcome…

Deconstruction of the anisotropic magnetic interactions from spin-entangled optical excitations in van der Waals antiferromagnets
Dipankar Jana, Swagata Acharya, Milan Orlita, Clement Faugeras, Dimitar Pashov, Mark van Schilfgaarde, Marek Potemski, Maciej Koperski
https://arxiv.org/abs/2510.03010

Deconstruction of the anisotropic magnetic interactions from spin-entangled optical excitations in van der Waals antiferromagnets
Magneto-optical excitations in antiferromagnetic d systems can originate from a multiplicity of light-spin and spin-spin interactions, as the light and spin degrees of freedom can be entangled. This is exemplified in van der Waals systems with attendant strong anisotropy between in-plane and out- of-plane directions, such as MnPS3 and NiPS3 films studied here. The rich interplay between the magnetic ordering and sub-bandgap optical transitions poses a challenge to resolve the mechanisms driving…

Holographic AME states in black hole interiors
Takanori Anegawa, Kotaro Tamaoka
https://arxiv.org/abs/2508.07634 https://arxiv.org/pdf/2508.07634

Holographic AME states in black hole interiors
We argue that the special extremal slice inside an AdS black hole is dual to an absolutely maximally entangled (AME) state. We demonstrate this by confirming the $n$-independence of holographic $n$-th Renyi entropies for any bi-partite subsystems. Our result gives an AME state in an infinite-volume system, where the local bond dimension is set by the black hole entropy. In particular, our construction provides concrete support from the gravity side for the emergence of random structures and an …

Entangled Photon Pair Generator via Biexciton-Exciton Cascade in Semiconductor Quantum Dots and its Simulation
Simon Sekav\v{c}nik, Paul Kohl, Janis N\"otzel
https://arxiv.org/abs/2510.09262

Entangled Photon Pair Generator via Biexciton-Exciton Cascade in Semiconductor Quantum Dots and its Simulation
The generation of entangled photon pairs is highly useful for many types of quantum technologies. In this work an entangled photon pair generator that utilises the biexciton-exciton cascade in semiconductor quantum dots is described on a physical, mathematical, and software level. The system is implemented and simulated as a self-contained component in a framework for bigger quantum optical experiments. Thus, it is a description to further the holistic understanding of the system for interdisci…

Variational optimization of projected entangled-pair states on the triangular lattice
Jan Naumann, Jens Eisert, Philipp Schmoll
https://arxiv.org/abs/2510.04907 https://

Variational optimization of projected entangled-pair states on the triangular lattice
We introduce a general corner transfer matrix renormalization group algorithm tailored to projected entangled-pair states on the triangular lattice. By integrating automatic differentiation, our approach enables direct variational energy minimization on this lattice geometry. In contrast to conventional approaches that map the triangular lattice onto a square lattice with diagonal next-nearest-neighbour interactions, our native formulation yields improved variational results at the same bond di…

DeCodec: Rethinking Audio Codecs as Universal Disentangled Representation Learners
Xiaoxue Luo, Jinwei Huang, Runyan Yang, Yingying Gao, Junlan Feng, Chao Deng, Shilei Zhang
https://arxiv.org/abs/2509.09201

DeCodec: Rethinking Audio Codecs as Universal Disentangled Representation Learners
Universal audio codecs learn entangled representations across audio types, whereas some specific codecs offer decoupled representations but are limited to speech. Real-world audio, however, often contains mixed speech and background sounds, and downstream tasks require selective access to these components. Therefore, we rethink the audio codec as a universal disentangled representation learner to enable controllable feature selection across different audio tasks. To this end, we introduce DeCod…

Certifying bipartite entangled states with few local measurements: from separable stabilizers to applications
Jennifer Ahiable, Andreas Winter
https://arxiv.org/abs/2509.13082 h…

Certifying bipartite entangled states with few local measurements: from separable stabilizers to applications
We show a simple and systematic way to certify any given bipartite state as the unique joint $1$-eigenstate of two separable projectors, each of which can be measured with simple local observables. This is practically useful, as the detection probabilities of the two stabilizer projectors relate directly to the fidelity of certification. The same result gives a simple and effective lower bound on the entanglement fidelity of a quantum channel in terms of two ensemble fidelities. We then gener…

Broadband entangled-photon omni-resonance in a planar optical cavity
Bryan L. Turo, Layton A. Hall, Bahaa E. A. Saleh, Ayman F. Abouraddy
https://arxiv.org/abs/2510.01595 https:…

Broadband entangled-photon omni-resonance in a planar optical cavity
Resonant field enhancement in an optical cavity is a promising pathway towards realizing optical nonlinearities at the few-photon level. This quest is hampered by inevitable narrowing of the resonant linewidth as the cavity finesse is increased, which necessitates striking a compromise between the magnitude of the field enhancement and the bandwidth over which it is harnessed. This difficulty is exacerbated for broadband entangled-photon pairs, which are typically frequency-anticorrelated, so t…

Loss Behavior in Supervised Learning with Entangled States
Alexander Mandl, Johanna Barzen, Marvin Bechtold, Frank Leymann, Lavinia Stiliadou
https://arxiv.org/abs/2509.10141 ht…

Loss Behavior in Supervised Learning with Entangled States
Quantum Machine Learning (QML) aims to leverage the principles of quantum mechanics to speed up the process of solving machine learning problems or improve the quality of solutions. Among these principles, entanglement with an auxiliary system was shown to increase the quality of QML models in applications such as supervised learning. Recent works focus on the information that can be extracted from entangled training samples and their effect on the approximation error of the trained model. Howe…

Ferroelectric Fluids for Nonlinear Photonics: Evaluation of Temperature Dependence of Second-Order Susceptibilities
Matija Lov\v{s}in, Luka Cmok, Calum J. Gibb, Jordan Hobbs, Richard J. Mandle, Alenka Mertelj, Irena Dreven\v{s}ek-Olenik, Nerea Sebastian
https://arxiv.org/abs/2509.11835

Ferroelectric Fluids for Nonlinear Photonics: Evaluation of Temperature Dependence of Second-Order Susceptibilities
Ferroelectric nematic fluids are promising materials for tunable nonlinear photonics, with applications ranging from second harmonic generation to sources of entangled photons. However, the few reported values of second-order susceptibilities vary widely depending on the molecular architecture. Here, we systematically measure second-order NLO susceptibilities of five different materials that exhibit the ferroelectric nematic phase, as well as the more recently discovered layered smectic A ferro…

Memp: Exploring Agent Procedural Memory
Runnan Fang, Yuan Liang, Xiaobin Wang, Jialong Wu, Shuofei Qiao, Pengjun Xie, Fei Huang, Huajun Chen, Ningyu Zhang
https://arxiv.org/abs/2508.06433

Memp: Exploring Agent Procedural Memory
Large Language Models (LLMs) based agents excel at diverse tasks, yet they suffer from brittle procedural memory that is manually engineered or entangled in static parameters. In this work, we investigate strategies to endow agents with a learnable, updatable, and lifelong procedural memory. We propose Memp that distills past agent trajectories into both fine-grained, step-by-step instructions and higher-level, script-like abstractions, and explore the impact of different strategies for Build, …

Beam-splitter-free, high-rate quantum key distribution inspired by intrinsic quantum mechanical spatial randomness of entangled photons
Ayan Kumar Nai, Gopal Prasad Sahu, Rutuj Gharate, C. M. Chandrashekar, G. K. Samanta
https://arxiv.org/abs/2509.10231

Beam-splitter-free, high-rate quantum key distribution inspired by intrinsic quantum mechanical spatial randomness of entangled photons
Quantum key distribution (QKD) using entangled photon sources (EPS) is a cornerstone of secure communication. Despite rapid advances in QKD, conventional protocols still employ beam splitters (BSs) for passive random basis selection. However, BSs intrinsically suffer from photon loss, imperfect splitting ratios, and polarization dependence, limiting the key rate, increasing the quantum bit error rate (QBER), and constraining scalability, particularly over long distances. By contrast, EPSs based…

Learning Object-Centric Representations in SAR Images with Multi-Level Feature Fusion
Oh-Tae Jang, Min-Gon Cho, Kyung-Tae Kim
https://arxiv.org/abs/2509.09298 https://

Learning Object-Centric Representations in SAR Images with Multi-Level Feature Fusion
Synthetic aperture radar (SAR) images contain not only targets of interest but also complex background clutter, including terrain reflections and speckle noise. In many cases, such clutter exhibits intensity and patterns that resemble targets, leading models to extract entangled or spurious features. Such behavior undermines the ability to form clear target representations, regardless of the classifier. To address this challenge, we propose a novel object-centric learning (OCL) framework, named…

Tripartite Entanglement Signal from Multipartite Entanglement of Purification
Ning Bao, Keiichiro Furuya, Joydeep Naskar
https://arxiv.org/abs/2509.08209 https://

Tripartite Entanglement Signal from Multipartite Entanglement of Purification
We propose a signal $Δ^{(3)}_p$ for genuine tripartite entanglement in finite-dimensional quantum systems and $Δ^{(3)}_w$ for holographic systems. We prove that $Δ^{(3)}_p$ is non-negative for any tripartite entangled mixed states. Based on the conjecture, the equality between an entanglement wedge cross section $E_w$ and entanglement of purification $E_p$, i.e., $E_w = E_P$ in the semiclassical limit, we apply the tripartite entanglement measure to study the structures of tripartite entangl…

Steady-state entanglement of spin qubits mediated by non-reciprocal and chiral magnons
Martijn Dols, Mikhail Cherkasskii, Victor A. S. V. Bittencourt, Carlos Gonzalez-Ballestero, Durga B. R. Dasari, Silvia Viola Kusminskiy
https://arxiv.org/abs/2509.13094

Steady-state entanglement of spin qubits mediated by non-reciprocal and chiral magnons
We propose a hybrid quantum system in which a magnet supporting non-reciprocal magnons, chiral magnons, or both mediates the dissipative and unidirectional coupling of spin qubits. By driving the qubits, the steady state of this qubit-qubit coupling scheme becomes the maximally entangled Bell state. We devise a protocol where the system converges to this entangled state and benchmark it including qubit decay and dephasing. The protocol is numerically tested on a hybrid system consisting of nitr…

Heralded Emission Detection in Quantum Dot Solids under Twin-Photon Excitation
Chieh Tsao, Xiang Li, Alex Hinkle, Yifan Chen, Elvar Oskarsson, Uri Banin, Hendrik Utzat
https://arxiv.org/abs/2509.11704 …

Heralded Emission Detection in Quantum Dot Solids under Twin-Photon Excitation
Harnessing quantum correlations between photons is an emerging direction in optical spectroscopy, but experimental progress has thus far been limited to fluorescence-detected studies of molecular systems at room temperature. Here, we demonstrate heralded emission detection (HED) under continuous-wave (CW) entangled-photon excitation of near-infrared (NIR)-emitting colloidal III-V quantum dots (QDs) at low temperatures. We use superconducting nanowire single-photon detectors (SNSPDs) and large-a…

Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV$_6$Sn$_6$
Rui Lou, Max Mende, Riccardo Vocaturo, Hao Zhang, Qingxin Dong, Man Li, Pengfei Ding, Erjian Cheng, Zhiguang Liao, Yu Zhang, Junfa Lin, Reza Firouzmandi, Vilmos Kocsis, Laura T. Corredor, Yurii Prots, Oleksandr Suvorov, Anupam Jana, Jun Fujii, Ivana Vobornik, Oleg Janson, Wenliang Zhu, Jeroen van den Brink, Cornelius Krellner, Minghu Pan, Bosen Wang, Tianlong …

Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV$_6$Sn$_6$
Applying angle-resolved photoemission spectroscopy and density functional theory calculations, we present compelling spectroscopic evidence demonstrating the intertwining and mutual interaction between the Kondo and kagome sublattices in heavy-fermion intermetallic compound YbV$_6$Sn$_6$. We reveal the Yb 4$f$-derived states near the Fermi level, along with the presence of bulk kagome bands and topological surface states. We unveil strong interactions between the 4$f$ and itinerant electrons, w…

Topological Mechanics of Entangled Networks
Juntao Huang, Jiabin Liu, Shaoting Lin
https://arxiv.org/abs/2509.17813 https://arxiv.org/pdf/2509.17813…

Topological Mechanics of Entangled Networks
Entangled networks are ubiquitous in tissues, polymers, and fabrics. However, their mechanics remain insufficiently understood due to the complexity of the topological constraints at the network level. Here, we develop a mathematical framework that models entangled networks as graphs, capturing topological constraints of entanglements. We prove that entanglements reduce system energy by enabling uniform tension along chains crossing entanglements and by redistributing stress through sliding. Un…

Existence and nonexistence of commutativity gadgets for entangled CSPs
Eric Culf, Josse van Dobben de Bruyn, Matthijs Vernooij, Peter Zeman
https://arxiv.org/abs/2509.07835 http…

Existence and nonexistence of commutativity gadgets for entangled CSPs
Commutativity gadgets allow NP-hardness proofs for classical constraint satisfaction problems (CSPs) to be carried over to undecidability proofs for the corresponding entangled CSPs. This has been done, for instance, for NP-complete boolean CSPs and 3-colouring in the work of Culf and Mastel. For many CSPs over larger alphabets, including $k$-colouring when $k \geq 4$, it is not known whether or not commutativity gadgets exist, or if the entangled CSP is decidable. In this paper, we study commu…

Classical State Detection Using Quantum State Tomography
Kim Fook Lee, Prem Kumar
https://arxiv.org/abs/2509.11509 https://arxiv.org/pdf/2509.11509

Classical State Detection Using Quantum State Tomography
We present a model to detect a classical state mixed with an idler photon from a polarization-entangled pair. A weak coherent light with a well-defined polarization, matched in wavelength to the idler photon, is injected into the idler channel. Quantum state tomography is then performed on both the classically mixed idler photon and its entangled signal partner. The reconstructed state is modeled as a combination of an $X-$quantum state and a classical-quantum (CQ) state. In this framework, the…

Dynamic syndrome decoder in volume-law phases of hybrid quantum circuits
Dawid Paszko, Marcin Szyniszewski, Arijeet Pal
https://arxiv.org/abs/2508.13045 https://

Dynamic syndrome decoder in volume-law phases of hybrid quantum circuits
Phases of matter with volume-law entanglement are frequently observed in quantum circuits and have numerous applications, ranging from deepening our understanding of quantum mechanics to advancements in quantum computing and cryptography. Their capacity to host entangled, complex quantum information is complemented by their ability to efficiently obscure it from quantum measurements through scrambling, reminiscent of quantum error-correction. However, the issue of initial-state decodability has…

Embezzlement as a "Self-Test" for Infinite Copies of Entangled States
Li Liu
https://arxiv.org/abs/2509.05036 https://arxiv.org/pdf/2509.05036

Embezzlement as a "Self-Test" for Infinite Copies of Entangled States
We investigate the operator-algebraic structure underlying entanglement embezzlement, a phenomenon where a fixed entangled state (the catalyst) can be used to generate arbitrary target entangled states without being consumed. We show that the ability to embezzle a target state $g$ imposes strong internal constraints on the catalyst state $f$: specifically, $f$ must contain infinitely many mutually commuting, locally structured copies of $g$. This property is formalized using C*-algebraic tools …

Percolation transition in entangled granular networks
Seongmin Kim, Daihui Wu, Yilong Han
https://arxiv.org/abs/2509.00216 https://arxiv.org/pdf/2509.00216…

Percolation transition in entangled granular networks
Highly nonconvex granular particles, such as staples and metal shavings, can form solid-like cohesive structures through geometric entanglement (interlocking). The network structure formed by this entanglement, however, remains largely unexplored. Here we utilize network science to investigate the entanglement networks of C-shaped granular particles under vibration through experiments and simulations. By analyzing key network properties, we demonstrate that these networks undergo a percolation …

Time-resolved certification of frequency-bin entanglement over multi-mode channels
St\'ephane Vinet, Marco Clementi, Marcello Bacchi, Yujie Zhang, Massimo Giacomin, Luke Neal, Paolo Villoresi, Matteo Galli, Daniele Bajoni, Thomas Jennewein
https://arxiv.org/abs/2508.10200

Time-resolved certification of frequency-bin entanglement over multi-mode channels
Frequency-bin entangled photons can be efficiently produced on-chip which offers a scalable, robust and low-footprint platform for quantum communication, particularly well-suited for resource-constrained settings such as mobile or satellite-based systems. However, analyzing such entangled states typically requires active and lossy components, limiting scalability and multi-mode compatibility. We demonstrate a novel technique for processing frequency-encoded photons using linear interferometry a…

Construction of the Complete Set of Maximally Entangled Basis Vectors for N-Qubit Systems
Chi-Chuan Hwang
https://arxiv.org/abs/2510.02685 https://arxiv.or…

Construction of the Complete Set of Maximally Entangled Basis Vectors for N-Qubit Systems
In this study, we first use a three-qubit system as an example to demonstrate the construction of quantum circuits for the eight maximally entangled basis vectors, subsequently extending the approach to N-qubit systems. We employ a random-number approach to generate maximally entangled basis vectors and their corresponding circuits, while also detailing the required number of single-qubit and CNOT gates. This approach not only provides a solid theoretical foundation but also establishes a pract…

Generation of frequency-bin-encoded dual-rail cluster states via time-frequency multiplexing of microwave photonic qubits
Zhiling Wang, Takeaki Miyamura, Yoshiki Sunada, Keika Sunada, Jesper Ilves, Kohei Matsuura, Yasunobu Nakamura
https://arxiv.org/abs/2508.10990

Generation of frequency-bin-encoded dual-rail cluster states via time-frequency multiplexing of microwave photonic qubits
Cluster states are a class of multi-qubit entangled states with broad applications such as quantum metrology and one-way quantum computing. Here, we present a protocol to generate frequency-bin-encoded dual-rail cluster states using a superconducting circuit consisting of a fixed-frequency transmon qubit, a resonator and a Purcell filter. We implement time-frequency multiplexing by sequentially emitting co-propagating microwave photons of distinct frequencies. The frequency-bin dual-rail encodi…

Construction of PPT entangled state and its detection by using second-order moment of the partial transposition
Rohit Kumar, Satyabrata Adhikari
https://arxiv.org/abs/2509.06565

Construction of PPT entangled state and its detection by using second-order moment of the partial transposition
In this work, we adopt a formalism by which we construct a new family of positive partial transpose (PPT) states, which includes separable and PPT entangled states (PPTES) in a $d_{1}\otimes d_{2}$ dimensional system and then derive a condition that can distinguish between them. The PPT condition is expressed in terms of the inequality between the second-order moment of the system's partial transposition $(p_2)$ and the reciprocal of the product of $d_{1}$ and $d_{2}$. The second order moment $…

High-dimensional topological photonic entanglement
M. Javad Zakeri, Armando Perez-Leija, Andrea Blanco-Redondo
https://arxiv.org/abs/2509.14164 https://arx…

High-dimensional topological photonic entanglement
The robust generation and manipulation of high-dimensional quantum states lies at the heart of modern quantum computation. The use of topology to resiliently encode and transport quantum information has been widely investigated in condensed matter and has recently penetrated quantum photonics. However, a route to scale up to a large number of entangled topological photonic modes had been missing. Here, we propose and experimentally demonstrate a method to generate high-dimensional topological p…

Hybrid Fiber-Free-Space Entanglement Distribution Using Off-the-Shelf Quantum Devices
Gustavo C. Amaral, Nienke M. ten Haaf, Breno Perlingeiro, David L. Bakker, Mark G. M. Boekel, Tim E. van Duivenbode, Karthik Selvan, Nicolas Oidtmann, Rafael Ochsendorf, Rick N. M. Wasserman, Mael Flament, Felipe Giraldo, Shane Andrewski, Mehdi Namazi, Federica Facchin, Mario Casta\~neda, Fokko de Vries, Sayali Shevate, Shaurya Bhave, Marco Gorter, Nico Coesel, David Mytling, Mike Mabry, Carlo Page, A…

Hybrid Fiber-Free-Space Entanglement Distribution Using Off-the-Shelf Quantum Devices
Entanglement serves as a fundamental resource for quantum technologies, enabling communication and computation tasks that surpass classical limits. Its distribution across networks is essential for interconnecting quantum processors, enabling distributed quantum computing to address complex challenges in areas such as drug discovery, material science, and optimization. In this work, we report the successful distribution of polarization-entangled photon pairs across a campus-scale, three-node qu…

Counter-propagating Entangled Photon Pairs from a Monolayer
Zhuoyuan Lu, Jiri Janousek, Syed M. Assad, Shuyao Qiu, Mayank Joshi, Yecheng Hu, Alex Y Song, Chuanyu Wang, Manuka Suriyage, Jie Zhao, Ping Koy Lam, Yuerui Lu
https://arxiv.org/abs/2508.06860

Counter-propagating Entangled Photon Pairs from a Monolayer
Non-phase-matched spontaneous parametric down-conversion (SPDC) in atomically thin materials provides new degrees of freedom and enhanced quantum information capacity compared to conventional phase-matched sources. These systems emerged as promising platforms for quantum computing, communication, and imaging, with the potential to support higher-order nonlinear processes. However, direct observation of photon-pair emission from a monolayer has remained experimentally challenging. In this work, …

Entanglement distribution in quantum networks via swapping of partially entangled states
Henrique Guerra, Tailan S. Sarubi, Rafael Chaves, Jonas Maziero
https://arxiv.org/abs/2508.04536

Entanglement distribution in quantum networks via swapping of partially entangled states
The entanglement swapping protocol (ESP) is a fundamental primitive for distributing quantum correlations across distant nodes in a quantum network. Recent studies have demonstrated that even when the involved qubit pairs are only partially entangled, it is still possible to concentrate and transmit entanglement via Bell-basis measurements. In this work, we extend these ideas to quantum networks with various topologies - including linear, star, and hybrid configurations - by analyzing the appli…

Scalable Network of Mach-Zehnder Interferometers with a Single Entangled Resource
Zhihui Yan, Yanni Feng, Luca Pezze, Zhaoqing Zeng, Jingxu Ma, Xiaoyu Zhou, Augusto Smerzi, Xiaojun Jia, Kunchi Peng
https://arxiv.org/abs/2509.08230

Scalable Network of Mach-Zehnder Interferometers with a Single Entangled Resource
Distributed quantum sensing exploits entanglement to enhance the estimation of multiple parameters across a network of spatially-separated sensors, achieving sensitivities beyond the classical limit. Potential applications cover a plethora of technologies, from precision navigation to biomedical imaging and environmental monitoring. However, practical implementations are challenged by the complex optimal distribution of entanglement throughout the sensing nodes, which affects scalability and ro…

Coherent phase control of two-color continuous variable entangled light
Andrea Grimaldi, Valeriy Novikov, T\'ulio Brito Brasil, Eugene Simon Polzik
https://arxiv.org/abs/2508.03303

Coherent phase control of two-color continuous variable entangled light
A continuous variable Einstein-Podolsky-Rosen (EPR) state is a resource for secure quantum communication and distributed quantum sensing. Here we present a technique for coherent control of the two-color EPR state generated by a frequency nondegenerate optical parametric oscillator. The scheme allows for robust control of the homodyne detection of each of the two EPR quantum fields separated by 200 nanometers. We apply our control scheme to stabilize and characterize a strong entangled state of…

Orbital angular momentum of entangled photons as a probe for relativistic effects
Fazilah Nothlawala, Kiki Dekkers, Moslem Mahdavifar, Jonathan Leach, Andrew Forbes, Isaac Nape
https://arxiv.org/abs/2508.01716

Orbital angular momentum of entangled photons as a probe for relativistic effects
Orbital angular momentum (OAM) as both classical and quantum states of light has proven essential in numerous applications, from high-capacity information transfer to enhanced precision and accuracy in metrology. Here, we extend OAM metrology to relativistic scenarios to determine the Lorentz factor of a moving reference frame, exploiting the fact that OAM is not Lorentz invariant. Using OAM correlations of entangled states, we show that their joint OAM spectrum is modified by length contractio…

Resource-efficient entanglement detection in high-dimensional states via two-qubit witnesses
Josef Kadlec, Artur Barasi\'nski, Karel Lemr
https://arxiv.org/abs/2509.13061 ht…

Resource-efficient entanglement detection in high-dimensional states via two-qubit witnesses
This paper presents an efficient method for detecting entanglement in high-dimensional two-qudit states by mapping the Hilbert space onto the space of two qubits. This transformation enables the use of well-established two-qubit entanglement witnesses. The proposed approach is not restricted to any specific class of states, successfully identifies a vast majority of pure entangled states, and requires a number of measurements that does not increase with the dimensionality of the qudits. The met…

Entanglement swapping for partially entangled qudits and the role of quantum complementarity
Diego S. Starke, Marcos L. W. Basso, Lucas C. C\'eleri, Jonas Maziero
https://arxiv.org/abs/2508.00813

Entanglement swapping for partially entangled qudits and the role of quantum complementarity
We extend the entanglement swapping protocol (ESP) to partially entangled qudit states and analyze the process within the framework of complete complementarity relations (CCRs). Building on previous results for qubits, we show that the average distributed entanglement between two parties via ESP is bounded above by the initial entanglement of one of the input pairs, and also by the product of the initial entanglements. Notably, we find that using initial states with vanishing local quantum cohe…

Time-frequency Entangled Photon Mediated CCZ Gate
Chenhui Wang, Weilong Wang, Yangyang Fei, Zhiqiang Fan, Hanshi Zhao, Yuyan Mage, Zheng Shan
https://arxiv.org/abs/2509.06497 ht…

Time-frequency Entangled Photon Mediated CCZ Gate
High-fidelity native multi-qubit operations are crucial to efficient quantum circuit compilation due to their ability of shortening circuit depth and enhence the performance. However, the design and implementation of these gates remain a challenge. Here, we demonstrate a hardware-efficient scalable scheme for direct CCZ gate implementation based on two-photon absorption phenomenon, which is applicable to current superconducting quantumcomputing platforms. By carefully optimizing the parameters …

Secure Quantum Key Distribution via Entangled Quantum Walkers
Chia-Tso Lai
https://arxiv.org/abs/2508.05593 https://arxiv.org/pdf/2508.05593

Secure Quantum Key Distribution via Entangled Quantum Walkers
Quantum Key Distribution (QKD) is an emerging cryptographic method designed for secure key sharing. Its security is theoretically guaranteed by fundamental principles of quantum mechanics, making it a leading candidate for future communication protocols. Quantum Random Walks (QRWs), on the other hand, are quantum processes that exhibit intriguing phenomena such as interference and superposition, enabling the generation of decentralized and asymmetric probability distributions. Inspired by both …

Entanglement distillation on symmetric two-qutrit entangled states of rank five
Zihua Song, Lin Chen, Yongge Wang
https://arxiv.org/abs/2509.21258 https://…

Entanglement distillation on symmetric two-qutrit entangled states of rank five
Entanglement distillation is a key step in quantum information, both theoretically and practically. It has been proven that non-positive-partial transpose (NPT) entangled states of rank at most four is 1-distillable under local operation and classical communications. In this paper we investigate the distillation of a more complex family of NPT entangled states, namely a family of symmetric two-qutrit states $\r$ of rank five with given eigenvectors. We explicitly construct five families of such…

Transport-Induced Decoherence of the Entangled Triplet Exciton Pair
Gerald Curran III, Luke J. Weaver, Zachary Rex, Ivan Biaggio
https://arxiv.org/abs/2507.23770 https://…

Transport-Induced Decoherence of the Entangled Triplet Exciton Pair
Decoherence effects for entangled triplet pairs in organic molecular crystals are analyzed for the case when excitons can hop between inequivalent lattice sites. The fluorescence quantum beats caused by quantum interference upon triplet-triplet recombination into an emissive singlet state are predicted as a function of hopping time and magnetic field based on a Monte Carlo analysis. Depending on exciton hopping rates, it is possible to have complete global decoherence and suppression of fluores…

Generation of C-band entangled photon pairs by biexciton-exciton cascade from symmetric InAs/InP quantum dots
Anna Musia{\l}, Maja Wasiluk, Katarzyna Roszak, Micha{\l} Gawe{\l}czyk, Wojciech Rudno-Rudzi\'nski, Pawe{\l} Wyborski, Johann P. Reithmaier, Mohamed Benyoucef, Grzegorz S\k{e}k
https://arxiv.org/abs/2509.24500

Generation of C-band entangled photon pairs by biexciton-exciton cascade from symmetric InAs/InP quantum dots
Hereby, we study the generation of pairs of polarization-entangled photons at telecom C-band by biexciton-exciton cascade from non-resonantly excited epitaxial InAs/InP quantum dots (QDs). It is realized without external tuning of the fine structure splitting (FSS), which does not exceed 10 $μ$eV in as-grown nanostructures, due to their high in-plane symmetry. Excitonic complexes are identified by means of excitation power-dependent and polarization-resolved magneto)microphotoluminescence. The…

Bound on entanglement in neural quantum states
Nisarga Paul
https://arxiv.org/abs/2510.11797 https://arxiv.org/pdf/2510.11797

Bound on entanglement in neural quantum states
Variational wavefunctions offer a practical route around the exponential complexity of many-body Hilbert spaces, but their expressive power is often sharply constrained. Matrix product states, for instance, are efficient but limited to area law entangled states. Neural quantum states (NQS) are widely believed to overcome such limitations, yet little is known about their fundamental constraints. Here we prove that feed-forward neural quantum states acting on $n$ spins with $k$ scalar nonlinearit…

The logic of quantum mechanics
Eric Buffenoir
https://arxiv.org/abs/2510.12502 https://arxiv.org/pdf/2510.12502

The logic of quantum mechanics
The quantum logic program originated in a 1936 article by G. Birkhoff and J. von Neumann. This program is generally disregarded due to no-go theorems restricting the existence of the tensor product of elementary quantum logics and, above all, the impossibility of considering entangled states and Bell non-local states within the framework of these composite quantum logics. We revisit this study from the beginning and reverse the perspective. Here, the existence of a tensor product and a star inv…

Bohmian Chaos and Entanglement in a Two-Qubit System
Athanasios C. Tzemos, George Contopoulos, Foivos Zanias
https://arxiv.org/abs/2509.10229 https://arxiv…

Bohmian Chaos and Entanglement in a Two-Qubit System
We study in detail the critical points of Bohmian flow, both in the inertial frame of reference (Y-points) and in the frames centered at the moving nodal points of the guiding wavefunction (X-points), and analyze their role in the onset of chaos in a system of two entangled qubits. We find the distances between these critical points and a moving Bohmian particle at varying levels of entanglement, with particular emphasis on the times at which chaos arises. Then, we find why some trajectories ar…

Computational complexity of injective projected entangled pair states
Dylan Harley, Freek Witteveen, Daniel Malz
https://arxiv.org/abs/2509.19963 https://a…

Computational complexity of injective projected entangled pair states
Projected entangled pair states (PEPS) constitute a variational family of quantum states with area-law entanglement. PEPS are particularly relevant and successful for studying ground states of spatially local Hamiltonians. However, computing local expectation values in these states is known to be postBQP-hard. Injective PEPS, where all constituent tensors fulfil an injectivity constraint, are generally believed to be better behaved, because they are unique ground states of spatially local Hamil…

Random Party Distillation on a Superconducting Processor
Alexander C. B. Greenwood, Jackson Russett, Hoi-Kwong Lo, Li Qian
https://arxiv.org/abs/2508.09110 https://

Random Party Distillation on a Superconducting Processor
Random party distillation refers to the process by which Einstein-Podolsky-Rosen pairs are randomly extracted from a single copy of a multipartite entangled state after multiple rounds of performing positive operator value measure operations. In this work, we propose a qubit-based implementation of a random party distillation protocol and demonstrate its efficacy on the superconducting hardware device, ibm_quebec. We demonstrate a 4-round implementation of the protocol, showing distillation rat…

Symmetric Localizable Multipartite Quantum Measurements from Pauli Orbits
Jef Pauwels, Cyril Branciard, Alejandro Pozas-Kerstjens, Nicolas Gisin
https://arxiv.org/abs/2509.01851

Symmetric Localizable Multipartite Quantum Measurements from Pauli Orbits
While the structure of entangled quantum states is relatively well understood, the characterization of entangled measurements, especially in multipartite and high-dimensional settings, remains far less developed. In this work, we introduce a general approach to construct highly symmetric, locally encodable orthonormal measurement bases, as orbits of a single fiducial state under tensor-product actions of Pauli subgroups. This framework recovers the Elegant Joint Measurement-a two-qubit measurem…

Structure of quantum measurements implementable with one round of classical communication
Arthur C. R. Dutra, Ties-A. Ohst, Hai-Chau Nguyen, Otfried G\"uhne
https://arxiv.org/abs/2510.09381

Structure of quantum measurements implementable with one round of classical communication
Measurements that can be implemented via local operations and classical communication (LOCC) constitute a class of operations that is available in future quantum networks in which parties share entangled resource states. We characterise the different classes of measurements implementable with LOCC, where communication is restricted to a single round with a fixed direction. In particular, using the framework of constrained separability problems, we provide a complete characterisation of the clas…

The Multiqubit Elegant Joint Measurement
Jef Pauwels, Nicolas Gisin
https://arxiv.org/abs/2509.01852 https://arxiv.org/pdf/2509.01852

The Multiqubit Elegant Joint Measurement
The Elegant Joint Measurement (EJM) is a highly symmetric, partially entangled two-qubit measurement whose local marginals form a regular tetrahedron on the Bloch sphere and which has a low entanglement cost for local implementation. It plays a central role in quantum networks exhibiting nonclassical correlations and serves as a paradigmatic example of an entangled measurement with local structure. Despite its significance, generalizing the EJM beyond two qubits has remained unresolved. Here, w…

Expanding a 4-qubit Dicke State a to 5-qubit Dicke State with Limited Qubit Access
Bibhuti Thapa, Oberon Moran, Duc-Kha Vu, Fatih Ozaydin
https://arxiv.org/abs/2508.07977 https:…

Expanding a 4-qubit Dicke State a to 5-qubit Dicke State with Limited Qubit Access
In scenarios where full access to all qubits of a multipartite quantum system is available and global operations can be implemented, the preparation of arbitrary entangled states - including multipartite Dicke states - is theoretically straightforward. However, practical constraints often limit direct control over all qubits. In this work, we first present an efficient method for preparing a four-qubit Dicke state, and then demonstrate how a four-qubit Dicke state can be expanded to a five-qubi…

Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory
Yu Guo, Anindya Banerji, Jia Boon Chin, Arya Chowdhury, Alexander Ling
https://arxiv.org/abs/2509.02096

Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory
We demonstrate a high-efficiency, free space optical delay line utilizing a nested multipass cell architecture. This design supports extended optical paths with low loss, aided by custom broadband dielectric coating that provides high reflectivity across a wide spectral bandwidth. The cell is characterized using polarization-entangled photon pairs, with signal photons routed through the delay line and idler photons used as timing reference. Quantum state tomography performed on the entangled pa…

Entanglement Assisted Non-local Optical Interferometry in a Quantum Network
P. -J. Stas, Y. -C. Wei, M. Sirotin, Y. Q. Huan, U. Yazlar, F. Abdo Arias, E. Knyazev, G. Baranes, B. Machielse, S. Grandi, D. Riedel, J. Borregaard, H. Park, M. Lon\v{c}ar, A. Suleymanzade, M. D. Lukin
https://arxiv.org/abs/2509.09464

Entanglement Assisted Non-local Optical Interferometry in a Quantum Network
The sensitivity of non-local optical measurements at low light intensities, such as those involved in long baseline telescope arrays, can be improved by using remote entanglement. Here, we demonstrate the use of entangled quantum memories in a quantum network of Silicon-vacancy centers in diamond nano-cavities to experimentally perform such non-local phase measurements. Specifically, we combine the generation of event-ready remote quantum entanglement, photon mode erasure that hides the "which-…

Equally entangled multiqubit states
Francisco Albarr\'an-Arriagada, Guillermo Romero, Juan Carlos Retamal
https://arxiv.org/abs/2508.20770 https://arxi…

Equally entangled multiqubit states
We present a protocol for generating multiqubit quantum states with translationally invariant pairwise entanglement. Our approach is tailored for digital quantum computers with restricted qubit connectivity, a common limitation in state-of-the-art hardware platforms. We examine two configurations: star connectivity, which enables rotationally invariant entanglement, and linear connectivity, which achieves translationally invariant entanglement. For the linear configuration, we use a variant of …

Dual-wavelength quantum skyrmions from liquid crystal topological defect
Mwezi Koni, Fazilah Nothlawala, Vagharshak Hakobyan, Isaac Nape, Etienne Brasselet, Andrew Forbes
https://arxiv.org/abs/2507.22815

Dual-wavelength quantum skyrmions from liquid crystal topological defect
We propose a spin-orbit strategy for generating dual-wavelength quantum skyrmions, realized either as entangled photon pairs at distinct wavelengths or as heralded single-photon states at a given wavelength -- regimes neither previously conceptualized nor demonstrated. By coupling a two-photon entangled state to an electrically tunable liquid crystal topological defect, we engineer both nonlocal and local skyrmionic topologies in a reconfigurable platform. These results open new directions for …

Carrier-Assisted Entanglement Purification
Jaemin Kim, Karthik Mohan, Sung Won Yun, Joonwoo Bae
https://arxiv.org/abs/2509.07514 https://arxiv.org/pdf/2509…

Carrier-Assisted Entanglement Purification
Entanglement distillation, a fundamental building block of quantum networks, enables the purification of noisy entangled states shared among distant nodes by local operations and classical communication. Its practical realization presents several technical challenges, including the storage of quantum states in quantum memory and the execution of coherent quantum operations on multiple copies of states within the quantum memory. In this work, we present an entanglement purification protocol via …

Decoherence-free interaction and maximally entangled state generation in double-giant-atom semi-infinite waveguide systems
Jie Liu, Yue Cai, Lei Tan
https://arxiv.org/abs/2508.17616

Decoherence-free interaction and maximally entangled state generation in double-giant-atom semi-infinite waveguide systems
Giant atoms are artificial atoms that can couple to a waveguide non-locally. Previous work has shown that two giant atoms in a braided configuration can interact through a one-dimensional infinite waveguide, with both individual and collective atomic relaxation being fully suppressed. In this paper, however, we show that the decoherence-free interaction (DFI) between two giant atoms can be realized in both braided and nested configurations when the waveguide is semi-infinite. This protected int…

Guess your neighbor's input: Quantum advantage in Feige's game
Simon Schmidt, Sigurd A. L. Storgaard, Michael Walter, Yuming Zhao
https://arxiv.org/abs/2510.08484 https:…

Guess your neighbor's input: Quantum advantage in Feige's game
In this article, we study a nonlocal game with two questions and three answers per player, which was first considered by Feige in 1991, and show that there is quantum advantage in this game. We prove that the game is a robust self-test for the $3$-dimensional maximally entangled state. Furthermore, we show that the game can be seen as the "or" of two games that each do not have quantum advantage. Lastly, we investigate the behavior of the game with respect to parallel repetition in the classica…

A Tensor Network Framework for Lindbladian Spectra and Steady States
Philipp Westhoff, Mattia Moroder, Ulrich Schollw\"ock, Sebastian Paeckel
https://arxiv.org/abs/2509.07709

A Tensor Network Framework for Lindbladian Spectra and Steady States
Quantum systems coupled to (non-)Markovian environments attract increasing attention due to their peculiar physical properties. Exciting prospects such as unconventional non-equilibrium phases beyond the Mermin-Wagner limit, or the environment-assisted, robust preparation of highly entangled states, demand a systematic analysis of quantum many-body phases out of equilibrium. Akin to the equilibrium case, this requires the computation of the low-lying eigenstates of Lindbladians, a problem chall…

Quantum-Kaniadakis entropy as a measure of quantum correlations through implicit bounds
Narayan S Iyer, Shraddha Sharma
https://arxiv.org/abs/2510.07241 https://

Quantum-Kaniadakis entropy as a measure of quantum correlations through implicit bounds
In the present article, we examine the relationship of negative conditional quantum Kaniadakis entropy ($α-$CQKE) with the fully entangled fraction (FEF) which is a substantial yardstick for quantum information processing protocols including teleportation, and quantum steerability, executed over four vital quantum states with maximally mixed marginals, the 2-qubit Werner state, the 2-qubit Weyl state, the 2-qudit Werner state and the isotropic state. We initiate our analysis in 2$\otimes$2 sys…

Reply to "Comment(s) to "Consequences of the single-pair measurement of the Bell parameter""
Marco Genovese, Fabrizio Piacentini
https://arxiv.org/abs/2509.07922

Reply to "Comment(s) to "Consequences of the single-pair measurement of the Bell parameter""
We reply to the comments made by M. Kupczynski and J. P. Lambare on our recent paper titled ''Consequences of the single-pair measurement of the Bell parameter'' [Phys. Rev. A 111, 022204 (2025)], questioning our claims on the implications on Quantum Mechanics interpretations (and alternative theories) generated by the results of a recent experiment [Quantum Sci. Technol. 9, 045027 (2024)] demonstrating the possibility of measuring the entire Bell parameter on a single entangled pair.

Geometric Discord of any arbitrary dimensional bipartite system and its application in quantum key distribution
Rashi Jain, Satyabrata Adhikari
https://arxiv.org/abs/2509.04927 …

Geometric Discord of any arbitrary dimensional bipartite system and its application in quantum key distribution
Entangled quantum states are regarded as a key resource in quantum key distribution (QKD) protocols. However, quantum correlations, other than entanglement can also play a significant role the QKD protocols. In this work, we will focus on one such measure of quantum correlation, known as geometric quantum discord (GQD). Firstly, we derive an analytical expression of GQD for two-qutrit quantum systems and further generalize it for $d_1\otimes d_2$ dimensional systems. Next, we apply the concept …

Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin
Marco Klotz, Andreas Tangemann, David Opferkuch, Alexander Kubanek
https://arxiv.org/abs/2508.05255

Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin
Quantum networks will rely on photons entangled to robust, local quantum registers for computation and error correction. We demonstrate control of and entanglement in a fully connected three-qubit $^{13}\mathrm{C}$ nuclear spin register in diamond. The register is coupled to a quasi-free electron spin-1/2 of a silicon-vacancy center (SiV). High strain decouples the SiVs electron spin from spin-orbit interaction reducing the susceptibility to phonons at liquid helium temperature. As a result, th…