Tootfinder

At Microsoft, we’re advancing quantum computing at every level. With our newly developed family of 4D geometric codes, and our co-designed quantum work with Atom Computing
, we’re getting closer to making large-scale quantum computing a reality. Learn more: https://aka.ms/AQBlogQEC

Microsoft advances quantum error correction with a family of novel four-dimensional codes - Microsoft Azure Quantum Blog
Learn how we're advancing quantum computing by developing 4D error-correction codes that are applicable to many types of qubits.

Upcoming GÉANT infoshare - Part 2 🚀
🔐 Quantum KMS Architectures and Services
This session will explore the key aspects of Key Management Systems (KMS) in enabling secure, scalable Quantum Key Distribution. Gain insights on architecture, standardisation, and integration—from both research and industry voices.
🔗 Sign up here: https://…

Infoshare: Quantum KMS Architectures and Services
The infoshare will focus on the aspects of Key Management Systems (KMS) for Quantum Key Distribution systems. KMS is a crucial component that allows to build, manage, scale QKD networks, define the interfaces for key delivery. The presentations will show KMS architectures, standardization, integration examples and strategies. KMS technologies are integral part of EuroQCI infrastructure and interconnectivity. The presentations will be provided by research institutions and also companies.The...

What is a good use case for quantum computers?
Michael Marthaler, Peter Pinski, Pascal Stadler, Vladimir Rybkin, Marina Walt
https://arxiv.org/abs/2506.15426

What is a good use case for quantum computers?
Identify, Transform, Benchmark, Show Quantum Advantage (ITBQ): Evaluating use cases for quantum computers. We introduce a four-step framework for assessing quantum computing applications -- from identifying relevant industry problems to demonstrating quantum advantage -- addressing steps often overlooked in the literature, such as rigorous benchmarking against classical solutions and the challenge of translating real-world tasks onto quantum hardware. Applying this framework to cases like NMR, …

"Fields" in classical and quantum field theories
Alberto Ibort, Arnau Mas, Luca Schiavone
https://arxiv.org/abs/2506.15327 https://

"Fields" in classical and quantum field theories
The challenges posed by the development of field theories, both classical and quantum, force us to question their most basic and foundational ideas like the role and origin of space-time, the meaning of physical states, etc. Among them the notion of ``field'' itself is notoriously difficult to address. These notes aim to analyze such notion from the perspective offered by the groupoid description of quantum mechanics inspired by Schwinger's picture of quantum mechanics. Then, a natural interpre…

Self-consciousness and personal identity in quantum panprotopsychism
Rodolfo Gambini, Jorge Pullin
https://arxiv.org/abs/2505.11530 https://

Self-consciousness and personal identity in quantum panprotopsychism
In previous papers, we demonstrated that an ontology of quantum mechanics, described in terms of states and events with internal phenomenal aspects (a form of panprotopsychism), is well suited to explain consciousness. We showed that the combination problems of qualities, structures and subjects in panpsychism and panprotopsychism stem from implicit hypotheses based on classical physics regarding supervenience, which are not applicable at the quantum level. Within this view, consciousness arise…

Quantum and Semi-Classical Signatures of Dissipative Chaos in the Steady State
Griffith Rufo, Sabrina Rufo, Pedro Ribeiro, Stefano Chesi
https://arxiv.org/abs/2506.14961

Quantum and Semi-Classical Signatures of Dissipative Chaos in the Steady State
We investigate the quantum-classical correspondence in open quantum many-body systems using the SU(3) Bose-Hubbard trimer as a minimal model. Combining exact diagonalization with semiclassical Langevin dynamics, we establish a direct connection between classical trajectories characterized by fixed-point attractors, limit cycles, or chaos and the spectral and structural properties of the quantum steady state. We show that classical dynamical behavior, as quantified by the sign of the Lyapunov ex…

Quantum-corrected black hole thermodynamics from the gravitational path integral
Yu-Qi Liu, Hao-Wei Yu, Peng Cheng
https://arxiv.org/abs/2506.15261 https:/…

Quantum-corrected black hole thermodynamics from the gravitational path integral
Exploring quantum effects from black hole thermodynamics has always been a pivotal topic. In recent years, the free energy landscape and ensemble-averaged theory based on the Euclidean path integral approach have provided further understanding of the statistical aspects of the black hole system. We investigate the quantum-corrected thermodynamics of the Reissner-Nordstrom-AdS black hole by including off-shell geometries in the path integral. We obtain a one-loop effective action by considering …

I was happy be involved in passing @… PhD in his viva yesterday! Check out his live coding environment for exploring quantum computer music: https://zen.cephasteom.co.uk/

Emergence of cosmic structure from Planckian discreteness
Gabriel R. Bengochea, Gabriel Leon, Alejandro Perez
https://arxiv.org/abs/2506.15413 https://

Emergence of cosmic structure from Planckian discreteness
In the standard inflationary paradigm the inhomogeneities observed in the CMB arise from quantum fluctuations of an initially homogeneous and isotropic vacuum state. This picture suffers from two well-known weaknesses. First, it assumes that quantum field theory remains valid at trans-Planckian scales, without modifications from quantum gravity. Second, it necessitates a quantum-to-classical transition in which fluctuations of a homogeneous quantum state become the classical inhomogeneities see…

Watermarking Quantum Neural Networks Based on Sample Grouped and Paired Training
Limengnan Zhou, Hanzhou Wu
https://arxiv.org/abs/2506.12675 https://

Watermarking Quantum Neural Networks Based on Sample Grouped and Paired Training
Quantum neural networks (QNNs) leverage quantum computing to create powerful and efficient artificial intelligence models capable of solving complex problems significantly faster than traditional computers. With the fast development of quantum hardware technology, such as superconducting qubits, trapped ions, and integrated photonics, quantum computers may become reality, accelerating the applications of QNNs. However, preparing quantum circuits and optimizing parameters for QNNs require quantu…

Replaced article(s) found for math.QA. https://arxiv.org/list/math.QA/new
[1/1]:
- A path description for $\varepsilon$-characters of representations of type $A$ restricted quantum...
Xiao-Juan An, Jian-Rong Li, Yan-Feng Luo, Wen-Ting Zhang

Quantum Parameter Estimation Uncertainty Relation
Bing-Shu Hu, Xiao-Ming Lu
https://arxiv.org/abs/2506.15352 https://arxiv.org/pdf/25…

Quantum Parameter Estimation Uncertainty Relation
Quantum multiparameter estimation aims to simultaneously estimate multiple parameters from observing quantum systems and data processing. The complexity of quantum multiparameter estimation arises primarily from measurement incompatibility and parameter correlations. By manipulating the multidimensional parameter space, we derive an estimation uncertainty relation that captures the impact of measurement incompatibility and parameter correlation on quantum two-parameter estimation. This uncertai…

Quantum metric and localization in a quasicrystal
Quentin Marsal, Patric Holmvall, Annica M. Black-Schaffer
https://arxiv.org/abs/2506.15575 https://

Quantum metric and localization in a quasicrystal
We use the quantum metric to understand the properties of quasicrystals, represented by the one-dimensional (1D) Fibonacci chain. We show that the quantum metric can relate the localization properties of the eigenstates to the scale-invariance of both the chain and its energy spectrum. In particular, the quantum metric incorporates information about distances between the local symmetry centers of each eigenstate, making it much more sensitive to the localization properties of quasicrystals than…

Learning Best Paths in Quantum Networks
Xuchuang Wang, Maoli Liu, Xutong Liu, Zhuohua Li, Mohammad Hajiesmaili, John C. S. Lui, Don Towsley
https://arxiv.org/abs/2506.12462

Learning Best Paths in Quantum Networks
Quantum networks (QNs) transmit delicate quantum information across noisy quantum channels. Crucial applications, like quantum key distribution (QKD) and distributed quantum computation (DQC), rely on efficient quantum information transmission. Learning the best path between a pair of end nodes in a QN is key to enhancing such applications. This paper addresses learning the best path in a QN in the online learning setting. We explore two types of feedback: "link-level" and "path-level". Link-le…

Beyond Decoherence: Control the Collective Quantum Dynamics of Quasi Particles in Topological Interface
Fatemeh Davoodi
https://arxiv.org/abs/2506.12805 ht…

Beyond Decoherence: Control the Collective Quantum Dynamics of Quasi Particles in Topological Interface
Long lived coherent quasiparticles are a promising foundation for novel quantum technologies, where maintaining quantum coherence is crucial. Decoherence, driven by finite emitter lifetimes, remains a central challenge in quantum computing. Here, we control the dynamics of spatially separated quantum emitters via preserving their phase information by introducing a topological waveguide as a robust chiral reservoir. Incoherent quantum emitters randomly positioned near a perturbed honeycomb plasm…

Quantum-assisted tracer dispersion in turbulent shear flow
Julia Ingelmann, Fabian Schindler, J\"org Schumacher
https://arxiv.org/abs/2506.14586 https…

Quantum-assisted tracer dispersion in turbulent shear flow
We present a quantum-assisted generative algorithm for synthetic tracks of Lagrangian tracer particles in a turbulent shear flow. The parallelism and sampling properties of quantum algorithms are used to build and optimize a parametric quantum circuit, which generates a quantum state that corresponds to the joint probability density function of the classical turbulent velocity components, p(u_1^{\prime}, u_2^{\prime}, u_3^{\prime}). Velocity samples are drawn by one-shot measurements on the qua…

Replaced article(s) found for cond-mat.quant-gas. https://arxiv.org/list/cond-mat.quant-gas/new
[1/1]:
- Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions
Baumg\"artner, Hertlein, Schmit, Dreon, M\'aximo, L…

Graphon Quantum Filtering Systems
Hamed Amini, Nina H. Amini, Sofiane Chalal, Gaoyue Guo
https://arxiv.org/abs/2506.12249 https://arx…

Graphon Quantum Filtering Systems
We consider a non-exchangeable system of interacting quantum particles with mean-field type interactions, subject to continuous measurement on a class of dense graphs. In the mean-field limit, we derive a graphon-based quantum filtering system of equations, study its well-posedness, and establish a propagation of chaos result for multiple bosonic systems with blockwise interactions. We then discuss applications to quantum graphon games and quantum state preparation.

Thermalization from quantum entanglement: jet simulations in the massive Schwinger model
Adrien Florio, David Frenklakh, Sebastian Grieninger, Dmitri E. Kharzeev, Andrea Palermo, Shuzhe Shi
https://arxiv.org/abs/2506.14983

Thermalization from quantum entanglement: jet simulations in the massive Schwinger model
We investigate the emergence of thermalization in a quantum field-theoretic model mimicking the production of jets in QCD -- the massive Schwinger model coupled to external sources. Specifically, we compute the expectation values of local operators as functions of time and compare them to their thermal counterparts, quantify the overlap between the evolving density matrix and the thermal one, and compare the dynamics of the energy-momentum tensor to predictions from relativistic hydrodynamics. …

Characterizing asymmetric and bimodal long-term financial return distributions through quantum walks
Stijn De Backer, Luis E. C. Rocha, Jan Ryckebusch, Koen Schoors
https://arxiv.org/abs/2505.13019

Characterizing asymmetric and bimodal long-term financial return distributions through quantum walks
The analysis of logarithmic return distributions defined over large time scales is crucial for understanding the long-term dynamics of asset price movements. For large time scales of the order of two trading years, the anticipated Gaussian behavior of the returns often does not emerge, and their distributions often exhibit a high level of asymmetry and bimodality. These features are inadequately captured by the majority of classical models to address financial time series and return distributio…

POPQC: Parallel Optimization for Quantum Circuits (Extended Version)
Pengyu Liu, Jatin Arora, Mingkuan Xu, Umut A. Acar
https://arxiv.org/abs/2506.13720 ht…

POPQC: Parallel Optimization for Quantum Circuits (Extended Version)
Optimization of quantum programs or circuits is a fundamental problem in quantum computing and remains a major challenge. State-of-the-art quantum circuit optimizers rely on heuristics and typically require superlinear, and even exponential, time. Recent work proposed a new approach that pursues a weaker form of optimality called local optimality. Parameterized by a natural number $Ω$, local optimality insists that each and every $Ω$-segment of the circuit is optimal with respect to an extern…

Analog Quantum Phase Estimation with Single-Mode Readout
Wei-Chen Lin, Chiao-Hsuan Wang
https://arxiv.org/abs/2506.15668 https://arxi…

Analog Quantum Phase Estimation with Single-Mode Readout
Eigenvalue estimation is a central problem for demonstrating quantum advantage, yet its implementation on digital quantum computers remains limited by circuit depth and operational overhead. We present an analog quantum phase estimation (aQPE) protocol that extracts the eigenenergies of a target Hamiltonian via continuous time evolution and single-mode cavity measurement. By encoding eigenvalue information as conditional cavity phase-space rotations, the scheme avoids deep quantum circuits and …

A Quantum Annealing Approach for Solving Optimal Feature Selection and Next Release Problems
Shuchang Wang, Xiaopeng Qiu, Yingxing Xue, Yanfu Li, Wei Yang
https://arxiv.org/abs/2506.14129

A Quantum Annealing Approach for Solving Optimal Feature Selection and Next Release Problems
Search-based software engineering (SBSE) addresses critical optimization challenges in software engineering, including the next release problem (NRP) and feature selection problem (FSP). While traditional heuristic approaches and integer linear programming (ILP) methods have demonstrated efficacy for small to medium-scale problems, their scalability to large-scale instances remains unknown. Here, we introduce quantum annealing (QA) as a subroutine to tackling multi-objective SBSE problems, leve…

This https://arxiv.org/abs/2211.15412 has been replaced.
link: https://scholar.google.com/scholar?q=a

STE-QUEST -- Space Time Explorer and QUantum Equivalence principle Space Test: The 2022 medium-class mission concept
Space-borne quantum technologies, particularly those based on atom interferometry, are heralding a new era of strategic and robust space exploration. The unique conditions of space, characterized by low noise and low gravity environments, open up diverse possibilities for applications ranging from precise time and frequency transfer to Earth Observation and the search of new Physics. In this paper, we summarise the M-class mission proposal in response to the 2022 call in ESA's science program: …

On Quantum BSDE Solver for High-Dimensional Parabolic PDEs
Howard Su, Huan-Hsin Tseng
https://arxiv.org/abs/2506.14612 https://arxiv.…

On Quantum BSDE Solver for High-Dimensional Parabolic PDEs
We propose a quantum machine learning framework for approximating solutions to high-dimensional parabolic partial differential equations (PDEs) that can be reformulated as backward stochastic differential equations (BSDEs). In contrast to popular quantum-classical network hybrid approaches, this study employs the pure Variational Quantum Circuit (VQC) as the core solver without trainable classical neural networks. The quantum BSDE solver performs pathwise approximation via temporal discretizati…

Quantum Radar and Research Assessment
Gaspare Galati, Gabriele Pavan, Frederick Daum
https://arxiv.org/abs/2506.13797 https://arxiv.o…

Quantum Radar and Research Assessment
Quantum Radar was studied in many Nations for about fifteen years with the production of some hundred publications. In the post 2020 literature, it is shown that, due to the exceedingly low transmitted power, Quantum Radar cannot produce neither significant results nor real world applications. Regrettably, most of the scientific community ignored this negative outcome: a fact worth of exam. A detailed study of such an assessment failure depicts the main shortcomings of the present situation, ca…

IBM plans to build IBM Quantum Starling, a "fault-tolerant" quantum computer with 20,000x the power of today's quantum computers, in New York state by 2029 (Wall Street Journal)
https://www.wsj.com…

Ergodic Theory of Inhomogeneous Quantum Processes
Abdessatar Souissi
https://arxiv.org/abs/2506.12280 https://arxiv.org/pdf/2506.1228…

Ergodic Theory of Inhomogeneous Quantum Processes
This work presents a rigorous framework for understanding ergodicity and mixing in time-inhomogeneous quantum systems. By analyzing quantum processes driven by sequences of quantum channels, we distinguish between forward and backward dynamics and reveal their fundamental asymmetries. A key contribution is the development of a quantum Markov-Dobrushin approach to characterize mixing behavior, offering clear criteria for convergence and exponential stability. The framework not only generalizes c…

Few-grid-point simulations of Big Bang singularity in quantum cosmology
Miloslav Znojil
https://arxiv.org/abs/2506.14848 https://arxi…

Few-grid-point simulations of Big Bang singularity in quantum cosmology
In the context of the current lack of compatibility of the classical and quantum approaches to gravity, exactly solvable elementary pseudo-Hermitian quantum models are analyzed supporting the acceptability of a point-like form of Big Bang. The purpose is served by a hypothetical (non-covariant) identification of the ``time of Big Bang'' with the Kato's exceptional-point parameter $t=0$. Consequences (including the ambiguity of the patterns of unfolding of the singularity after Big Bang) are stu…

Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
Jipeng Wang, Joscha Hanel, Zenghui Jiang, Raphael Joos, Michael Jetter, Eddy Patrick Rugeramigabo, Simone Luca Portalupi, Peter Michler, Xiao-Yu Cao, Hua-Lei Yin, Shan Lei, Jingzhong Yang, Michael Zopf, Fei Ding
https://arxiv.org/abs/2506.155…

Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
Quantum key distribution (QKD) with deterministic single photon sources has been demonstrated over intercity fiber and free-space channels. The previous implementations relied mainly on polarization encoding schemes, which are susceptible to birefringence, polarization-mode dispersion and polarization-dependent loss in practical fiber networks. In contrast, time-bin encoding offers inherent robustness and has been widely adopted in mature QKD systems using weak coherent laser pulses. However, i…

Entanglement through high-energy scattering in noncommutative quantum electrodynamics
Carmelo P. Martin
https://arxiv.org/abs/2506.15350 https://

Entanglement through high-energy scattering in noncommutative quantum electrodynamics
We analyze the tree-level generation of entanglement through some key scattering processes in massless quantum electrodynamics on canonical noncomutative spacetime with space-space type of noncommutativity. The fermions in the noncommutative theory will be zero charge fermions. The scattering processes we shall study do not occur in ordinary Minkowski spacetime. We shall use the concurrence to characterize the amount of entanglement generated through a given scattering process. We shall show th…

High-fidelity collisional quantum gates with fermionic atoms
Petar Bojovi\'c, Timon Hilker, Si Wang, Johannes Obermeyer, Marnix Barendregt, Dorothee Tell, Thomas Chalopin, Philipp M. Preiss, Immanuel Bloch, Titus Franz
https://arxiv.org/abs/2506.14711

High-fidelity collisional quantum gates with fermionic atoms
Quantum simulations of electronic structure and strongly correlated quantum phases are widely regarded as among the most promising applications of quantum computing. These simulations require the accurate implementation of motion and entanglement of fermionic particles. Instead of the commonly applied costly mapping to qubits, fermionic quantum computers offer the prospect of directly implementing electronic structure problems. Ultracold neutral atoms have emerged as a powerful platform for spi…

Quantum Error Correction Exploiting Degeneracy to Approach the Hashing Bound
Kenta Kasai
https://arxiv.org/abs/2506.15636 https://arx…

Quantum Error Correction Exploiting Degeneracy to Approach the Hashing Bound
Quantum error correction is essential for realizing scalable quantum computation. Among various approaches, low-density parity-check codes over higher-order Galois fields have shown promising performance due to their structured sparsity and compatibility with iterative decoding algorithms whose computational complexity scales linearly with the number of physical qubits. In this work, we demonstrate that explicitly exploiting the degeneracy of quantum errors can significantly enhance the decodin…

The Cosmological Constant from a Quantum Gravitational $\theta$-Vacua and the Gravitational Hall Effect
Stephon Alexander, Heliudson Bernardo, Aaron Hui
https://arxiv.org/abs/2506.14886

The Cosmological Constant from a Quantum Gravitational $θ$-Vacua and the Gravitational Hall Effect
We provide a new perspective on the cosmological constant by exploring the background-independent Wheeler-DeWitt quantization of general relativity. The Chern-Simons-Kodama state of quantum gravity, a generalization of the Hartle-Hawking and Vilenkin states, has a striking structural similarity to the topological field theory of the quantum Hall effect. As a result, we study the gravitational topological $θ$-sectors in analogy to Yang-Mills theory. We find that the cosmological constant $Λ$ i…

The Journey from Planck Distribution to Bose Statistics From Classical to Quantum Mechanics and Beyond
Shreetam Dash, Prasanta K. Panigrahi
https://arxiv.org/abs/2505.11519

The Journey from Planck Distribution to Bose Statistics From Classical to Quantum Mechanics and Beyond
In 1924, Satyendra Nath Bose's pioneering work laid the foundation for Bose-Einstein statistics, which describes particles with integral spins. His derivation of Planck's law for blackbody radiation bypassed classical assumptions, relying instead on the statistical mechanics of light quanta. Bose's methodology addressed limitations in existing theories, such as Einstein's dependence on classical concepts like Wien's displacement law and Bohr's correspondence principle. Further, his work undersc…

Quasi-1D Coulomb drag between spin-polarized quantum wires
Mingyang Zheng, Rebika Makaju, Rasul Gazizulin, Alex Levchenko, Sadhvikas J. Addamane, Dominique Laroche
https://arxiv.org/abs/2506.14967

Quasi-1D Coulomb drag between spin-polarized quantum wires
One-dimensional (1D) quantum wires provide a versatile platform for studying strong electron-electron interactions and collective excitations under confinement. Coulomb drag between 1D systems offers a powerful probe of Tomonaga-Luttinger liquid (TLL) physics, with theoretical predictions suggesting distinct power-law in temperature dependencies between the spin-full and the spin-polarized regimes. However, experimental verification has thus far remained limited. Here, we report measurements of…

Nano-resolved sensing of 3D electromagnetic fields via single emitters' extreme variation of enhanced spontaneous emission
R. Margoth C\'ordova-Castro, Dirk Jonker, Cl\'ement Cabriel, Mario Zapata-Herrera, Bart van Dam, Yannick De Wilde, Robert W. Boyd, Arturo Susarrey-Arce, Ignacio Izeddin, Valentina Krachmalnicoff
https://

Nano-resolved sensing of 3D electromagnetic fields via single emitters' extreme variation of enhanced spontaneous emission
Controlling quantum light-matter interactions at scales smaller than the diffraction limit at the single quantum emitter level is a critical challenge to the goal of advancing quantum technologies. We introduce a novel material platform that enables precise engineering of spontaneous emission changes in molecular single emitters through 3D nanofields. This platform is based on a 3D hollow plasmonic nanomaterial arranged in a square lattice, uniformly scalable to the centimeter scale while maint…

High-Efficiency Quantum Memory of Full-Bandwidth Squeezed Light
Jinxian Guo, Meihong Wang, Zeliang Wu, Chenyu Qiao, Fengyi Xu, Xiaoran Zhang, Xiaolong Su, Liqing Chen, Weiping Zhang
https://arxiv.org/abs/2506.15399

High-Efficiency Quantum Memory of Full-Bandwidth Squeezed Light
In continuous-variable quantum information processing, it is crucial to develop high-efficiency and broadband quantum memory of squeezed light, which enables the storage of full-bandwidth information. Here, we present a quantum memory of squeezed light with up to 24 MHz bandwidth, which is at least 12 times that of previous narrowband resonant memory systems, via a far-off resonant Raman process. We achieve output squeezing of as high as 1.0 dB with fidelity above 92% and a memory efficiency of…

Randomised composite linear-combination-of-unitaries: its role in quantum simulation and observable estimation
Jinzhao Sun, Pei Zeng
https://arxiv.org/abs/2506.15658

Randomised composite linear-combination-of-unitaries: its role in quantum simulation and observable estimation
Randomisation is widely used in quantum algorithms to reduce the number of quantum gates and ancillary qubits required. A range of randomised algorithms, including eigenstate property estimation by spectral filters, Hamiltonian simulation, and perturbative quantum simulation, though motivated and designed for different applications, share common features in the use of unitary decomposition and Hadamard-test-based implementation. In this work, we start by analysing the role of randomised linear-…

Replaced article(s) found for quant-ph. https://arxiv.org/list/quant-ph/new
[3/3]:
- Norm Inequality for Perturbed Quantum Evolutions and Its Application to Grover's Algorithm
Kohei Kobayashi

Lower Bounds on Quantum Tunneling for Excited States
Charles L. Fefferman, Jacob Shapiro, Michael I. Weinstein
https://arxiv.org/abs/2506.12650 https://

Lower Bounds on Quantum Tunneling for Excited States
We revisit the problem of quantum tunneling for a particle moving in the continuum, and in the absence of a magnetic field. In all spatial dimensions, we extend previous results to the case where the single-well potential satisfies reflection-symmetry.

Classical analog of the T. D. Lee model for renormalization
K. Xu, C. P. Sun
https://arxiv.org/abs/2506.15161 https://arxiv.org/pdf/2…

Classical analog of the T. D. Lee model for renormalization
While divergence and renormalization of physical quantities are frequently encountered in quantum field theory (QFT), they are not necessarily quantum-specific characteristics. We show in this paper that there exists a classical counterpart of the Lee model which is the model of coupled harmonic oscillators (CHO). It is demonstrated that the frequency divergence in this classical model precisely replicates the phenomenon of mass divergence in the Lee model, as does the corresponding renormaliza…

Replaced article(s) found for quant-ph. https://arxiv.org/list/quant-ph/new
[2/3]:
- Hiding, Shuffling, and Cycle Finding: Quantum Algorithms on Edge Lists
Amin Shiraz Gilani, Daochen Wang, Pei Wu, Xingyu Zhou

Testing the Quantum Equivalence Principle with Gravitational Waves
Saurya Das, Mitja Fridman, Gaetano Lambiase
https://arxiv.org/abs/2506.14049 https://

Testing the Quantum Equivalence Principle with Gravitational Waves
We study modifications of gravitational wave observables, such as the wave amplitude and frequency, which follow from the quantum equivalence principle, and are expressed in terms of the inertial, gravitational and rest masses of the LIGO/Virgo mirrors. We provide bounds on the violations of the quantum equivalence principle by comparing the results with the most resolved gravitational wave events observed by the LIGO/Virgo collaboration. The formalism is equally applicable to other future grou…

High-expressibility Quantum Neural Networks using only classical resources
Marco Maronese, Francesco Ferrari, Matteo Vandelli, Daniele Dragoni
https://arxiv.org/abs/2506.13605

High-expressibility Quantum Neural Networks using only classical resources
Quantum neural networks (QNNs), as currently formulated, are near-term quantum machine learning architectures that leverage parameterized quantum circuits with the aim of improving upon the performance of their classical counterparts. In this work, we show that some desired properties attributed to these models can be efficiently reproduced without necessarily resorting to quantum hardware. We indeed study the expressibility of parametrized quantum circuit commonly used in QNN applications and …

Many-body Localization and Poisson statistics in the Quantum Sun model
Wojciech De Roeck, Amirali Hannani
https://arxiv.org/abs/2506.13511 https://

Many-body Localization and Poisson statistics in the Quantum Sun model
The Quantum Sun model is a many-body Hamiltonian model of interacting spins arranged on the half-line. Spins at distance $n$ from the origin are coupled to the rest of the system via a term of strength $α^n$, with $α\in (0,1)$. From theoretical and numerical considerations, it is believed that this model undergoes a localization-delocalization transition at the critical value $α=\frac{1}{\sqrt{2}}$. We prove that, for $α\ll \frac{1}{\sqrt{2}}$, the model is localized and that its spectral s…

Shadow and strong-field lensing effects of quantum-corrected RN blackhole
Nikko John Leo S. Lobos, Virginia C. Fernandez
https://arxiv.org/abs/2506.13091 h…

Shadow and strong-field lensing effects of quantum-corrected RN blackhole
We investigate the effects of a quantum-corrected RN black hole on the shadow using Perlick methodology and strong-field gravitational lensing using Tsukamoto's approach. Our analysis shows that even at extreme charge, the predicted shadow remains within the observational bounds set by the Event Horizon Telescope for both M87* and Sgr A*. The charge significantly influences the deflection angle near the photon sphere, while its effect diminishes at larger distances. In contrast, the quantum cor…

Learning to Maximize Quantum Neural Network Expressivity via Effective Rank
Juan Yao
https://arxiv.org/abs/2506.15375 https://arxiv.o…

Learning to Maximize Quantum Neural Network Expressivity via Effective Rank
Quantum neural networks (QNNs) are widely employed as ansätze for solving variational problems, where their expressivity directly impacts performance. Yet, accurately characterizing QNN expressivity remains an open challenge, impeding the optimal design of quantum circuits. In this work, we introduce the effective rank, denoted as $κ$, as a novel quantitative measure of expressivity. Specifically, $κ$ captures the number of effectively independent parameters among all the variational paramet…

Excitation Amplitude Sampling for Low Variance Electronic Structure on Quantum Computers
Connor Lenihan, Oliver J. Backhouse, Tom W. A. Montgomery, Phalgun Lolur, M. J. Bhaseen, George H. Booth
https://arxiv.org/abs/2506.15438

Excitation Amplitude Sampling for Low Variance Electronic Structure on Quantum Computers
We combine classical heuristics with partial shadow tomography to enable efficient protocols for extracting information from correlated ab initio electronic systems encoded on quantum devices. By proposing the use of a correlation energy functional and sampling of a polynomial set of excitation amplitudes of the quantum state, we can demonstrate an almost two order of magnitude reduction in required number of shots for a given statistical error in the energy estimate, as well as observing a lin…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Cosmic Censorship near FLRW spacetimes with negative spatial curvature
David Fajman, Liam Urban

Large effects from quantum reference frames
Martin Bojowald, Luis Martinez
https://arxiv.org/abs/2506.14721 https://arxiv.org/pdf/250…

Large effects from quantum reference frames
Reference frames are used to parameterize measurements of physical effects, but since their practical realization uses material objects, they may affect observations performed in a combined quantum state of the measured system together with the frame. Here, a procedure is used that makes it possible to describe non-monotonic reference scales in a quantum treatment, revealing large quantum effects in the measured system whenever a reference frame encounters a turning point. Subtle quantum correl…

Fidelity of entanglement and quantum entropies: unveiling their relationship in quantum states and channels
Komal Kumar, Bivas Mallick, Tapaswini Patro, Nirman Ganguly
https://arxiv.org/abs/2506.11506

Fidelity of entanglement and quantum entropies: unveiling their relationship in quantum states and channels
Entanglement serves as a fundamental resource for various quantum information processing tasks. Fidelity of entanglement (which measures the proximity to a maximally entangled state) and various quantum entropies are key indicators for certifying entanglement in a quantum state. Quantum states with high fidelity are particularly useful for numerous information-theoretic applications. Similarly, states possessing negative conditional entropy provide significant advantages in several quantum info…

Quantum algorithm for solving generalized eigenvalue problems with application to the Schr\"odinger equation
Grzegorz Rajchel-Mieldzio\'c, Szymon Pli\'s, Emil Zak
https://arxiv.org/abs/2506.13534

Quantum algorithm for solving generalized eigenvalue problems with application to the Schrödinger equation
Accurate computation of multiple eigenvalues of quantum Hamiltonians is essential in quantum chemistry, materials science, and molecular spectroscopy. Estimating excited-state energies is challenging for classical algorithms due to exponential scaling with system size, posing an even harder problem than ground-state calculations. We present a quantum algorithm for estimating eigenvalues and singular values of parameterized matrix families, including solving generalized eigenvalue problems that …

Entangled Unruh-DeWitt detectors amplify quantum coherence
Shu-Min Wu, Yu-Xuan Wang, Wentao Liu
https://arxiv.org/abs/2506.14115 https://

Entangled Unruh-DeWitt detectors amplify quantum coherence
We explore the quantum coherence between a pair of entangled Unruh-DeWitt detectors, interacting with a quantum field, using a nonperturbative approach in a (3+1)-dimensional Minkowski spacetime with instantaneous switching ($δ$-switching). It is intriguing to observe that for a maximally entangled state, increasing the coupling strength enhances the detectors' initial quantum coherence while simultaneously causing a monotonic decrease in their initial entanglement. This reveals a remarkable p…

Several types of quantum Wasserstein distance based on an optimization over separable states
G\'eza T\'oth, J\'ozsef Pitrik
https://arxiv.org/abs/2506.14523

Several types of quantum Wasserstein distance based on an optimization over separable states
We consider several definitions of the quantum Wasserstein distance based on an optimization over general bipartite quantum states with given marginals. Then, we examine the quantities obtained after the optimization is carried out over bipartite separable states instead. We prove that several of these quantities are equal to each other. Thus, we connect several approaches in the literature. As a byproduct, we show that the Uhlmann-Jozsa quantum fidelity can also be written as an optimization o…

Hamiltonian Formalism for Comparing Quantum and Classical Intelligence
Elija Perrier
https://arxiv.org/abs/2506.14456 https://arxiv.o…

Hamiltonian Formalism for Comparing Quantum and Classical Intelligence
The prospect of AGI instantiated on quantum substrates motivates the development of mathematical frameworks that enable direct comparison of their operation in classical and quantum environments. To this end, we introduce a Hamiltonian formalism for describing classical and quantum AGI tasks as a means of contrasting their interaction with the environment. We propose a decomposition of AGI dynamics into Hamiltonian generators for core functions such as induction, reasoning, recursion, learning,…

Norm Inequality for Perturbed Quantum Evolutions and Its Application to Grover's Algorithm
Kohei Kobayashi
https://arxiv.org/abs/2506.14230 https://

Norm Inequality for Perturbed Quantum Evolutions and Its Application to Grover's Algorithm
We investigate the impact of coherent control errors on quantum state evolution by deriving a general norm inequality based on Gronwall's lemma. This inequality provides an explicit upper bound on the deviation between an ideal quantum state and one subject to arbitrary coherent perturbations, including both time-dependent and time-independent cases. The framework is broadly applicable, requiring no assumptions about the detailed structure of the perturbation and full dynamics of the quantum sy…

Spin Correlations in Recirculating Multipass Alkali Cells for Advancing Quantum Magnetometry
Qian Ling Kee, Lingyi Zhao, Ruvi Lecamwasam, Biveen Shajilal, Xinan Liang, Joel K Jose, Yao Chen, Ping Koy Lam, Tao Wang
https://arxiv.org/abs/2506.14160

Spin Correlations in Recirculating Multipass Alkali Cells for Advancing Quantum Magnetometry
Multipass cells are critical components in a variety of quantum technologies, including atomic magnetometers and optical quantum memories, due to their ability to achieve long optical paths within compact volumes. In optical magnetometry, increasing the optical depth through multipass geometries enhances sensitivity by reducing photon shot noise and enabling quantum nondemolition (QND) detection. In this work, we present a novel recirculating multipass alkali cell that improves the active-to-ce…

Temperature dependent single- and double-quantum relaxation of negatively charged boron vacancies in hexagonal boron nitride
Lin-Ke Xie, Wei Liu, Kaiyu Huang, Nai-Jie Guo, Jun-You Liu, Yu-Hang Ma, Ya-Qi Wu, Yi-Tao Wang, Zhao-an Wang, Xiao-Dong Zeng, Jia-Ming Ren, Chun Ao, Shuo Deng, Haifei Lu, Jian-Shun Tang, Chuan-Feng Li, Guang-Can Guo
https://

Temperature dependent single- and double-quantum relaxation of negatively charged boron vacancies in hexagonal boron nitride
The negatively charged boron vacancy in two-dimensional hexagonal boron nitride has emerged as a promising candidate for quantum sensing. The coherence time of this defect spins which coherent quantum sensing resides in is limited spin-phonon interactions, while the underlying physical mechanism of the corresponding high-temperature behavior is still not fully understood. Here, we probe the single- and double-quantum relaxation rates on this center over the temperature range from 293 to 393 K. …

Blocklet concatenation: Low-overhead fault-tolerant protocols for fusion-based quantum computation
Daniel Litinski
https://arxiv.org/abs/2506.13619 https:/…

Blocklet concatenation: Low-overhead fault-tolerant protocols for fusion-based quantum computation
We introduce a construction for protocols for fault-tolerant quantum computing based on code concatenation and transversal gates. These protocols can be interpreted as families of quantum circuits of low-weight stabilizer measurements without strict locality constraints, effectively implementing concatenated codes. However, we primarily study these protocols in the context of photonic fusion-based quantum computing (FBQC), where they yield families of fusion networks with constant-sized resourc…

Pairing particles into holonomies
Vera Neef, Matthias Heinrich, Tom A. W. Wolterink, Alexander Szameit
https://arxiv.org/abs/2506.13442 https://

Pairing particles into holonomies
Holonomies are of great interest to quantum computation and simulation. The geometrical nature of these entities offers increased stability to quantum gates. Furthermore, symmetries of particle physics are naturally reflected in holonomies, making them ideally suited for quantum simulation of quantum chromodynamics and grand unified theories. Yet, practically designing quantum holonomies with the required properties and scale is challenging. Here, we construct a new class of holonomies by incre…

Quantum-inspired algorithm for simulating viral response
D. O. Konina, D. I. Korbashov, I. V. Kovalchuk, A. A. Nizamieva, D. A. Chermoshentsev, A. K. Fedorov
https://arxiv.org/abs/2506.15671

Quantum-inspired algorithm for simulating viral response
Understanding the properties of biological systems is an exciting avenue for applying advanced approaches to solving corresponding computational tasks. A specific class of problems that arises in the resolution of biological challenges is optimization. In this work, we present the results of a proof-of-concept study that applies a quantum-inspired optimization algorithm to simulate a viral response. We formulate an Ising-type model to describe the patterns of gene activity in host responses. Re…

Breaking even with magic: demonstration of a high-fidelity logical non-Clifford gate
Shival Dasu, Simon Burton, Karl Mayer, David Amaro, Justin A. Gerber, Kevin Gilmore, Dan Gresh, Davide DelVento, Andrew C. Potter, David Hayes
https://arxiv.org/abs/2506.14688

Breaking even with magic: demonstration of a high-fidelity logical non-Clifford gate
Encoding quantum information to protect it from errors is essential for performing large-scale quantum computations. Performing a universal set of quantum gates on encoded states demands a potentially large resource overhead and minimizing this overhead is key for the practical development of large-scale fault-tolerant quantum computers. We propose and experimentally implement a magic-state preparation protocol to fault-tolerantly prepare a pair of logical magic states in a [[6,2,2]] quantum er…

Fast, continuous and coherent atom replacement in a neutral atom qubit array
Yiyi Li, Yicheng Bao, Michael Peper, Chenyuan Li, Jeff D. Thompson
https://arxiv.org/abs/2506.15633

Fast, continuous and coherent atom replacement in a neutral atom qubit array
Neutral atom quantum processors are a promising platform for scalable quantum computing. An obstacle to implementing deep quantum circuits is managing atom loss, which constitutes a significant fraction of all errors. Current approaches are either not capable of replacing lost atoms in the middle of a circuit -- and therefore restricted to fixed, short circuit depths -- or require more than an order of magnitude longer time than gate and measurement operations to do so. In this work, we demonst…

Replaced article(s) found for quant-ph. https://arxiv.org/list/quant-ph/new
[1/3]:
- Experimental Realization of Genuine Three-copy Collective Measurements for Optimal Information Ex...
Zhou, Yi, Yan, Hou, Zhu, Xiang, Li, Guo

Topological Contextuality and Quantum Representations
Tzu-Miao Chou
https://arxiv.org/abs/2506.14537 https://arxiv.org/pdf/2506.14537…

Topological Contextuality and Quantum Representations
Quantum contextuality, a fundamental feature distinguishing quantum theory from classical models, is investigated via algebraic and topological structures inherent in modular tensor categories. This work rigorously demonstrates that braid group representations induced by modular categories, particularly those associated with SU(2) at level k and Fibonacci anyon models, exhibit state-dependent contextuality characterized by violations of noncontextuality inequalities. By explicitly constructing …

Purely quantum memory in closed systems observed via imperfect measurements
Jorge Tabanera-Bravo, Alja\v{z} Godec
https://arxiv.org/abs/2506.13689 https://…

Purely quantum memory in closed systems observed via imperfect measurements
The detection and quantification of non-Markovianity, a.k.a. memory, in quantum systems is a central problem in the theory of open quantum systems. There memory is as a result of the interaction between the system and its environment. Little is known, however, about memory effects induced by imperfect measurements on closed systems, where an entanglement with the environment is not possible. We investigate the emergence and characteristics of memory in closed systems observed via imperfect stro…

Mitigating sloppiness in joint estimation of successive squeezing parameters
Priyanka Sharma, Stefano Olivares, Devendra Kumar Mishra, Matteo G. A. Paris
https://arxiv.org/abs/2506.15638

Mitigating sloppiness in joint estimation of successive squeezing parameters
When two successive squeezing operations with the same phase are applied to a field mode, reliably estimating the amplitude of each is impossible because the output state depends solely on their sum. In this case, the quantum statistical model becomes sloppy, and the quantum Fisher information matrix turns singular. However, estimation of both parameters becomes feasible if the quantum state is subjected to an appropriate scrambling operation between the two squeezing operations. In this work, …

Certified randomness from quantum speed limits
Caroline L. Jones, Albert Aloy, Gerard Higgins, Markus P. Mueller
https://arxiv.org/abs/2506.14526 https://

Certified randomness from quantum speed limits
Quantum speed limits are usually regarded as fundamental restrictions, constraining the amount of computation that can be achieved within some given time and energy. Complementary to this intuition, here we show that these limitations are also of operational value: they enable the secure generation of certified randomness. We consider a prepare-and-measure scenario with some (experimentally determined or promised) upper bound on the energy uncertainty of the average prepared quantum state, but …

Macroscopicity of quantum superposition
Xiao-Fu Peng
https://arxiv.org/abs/2506.14458 https://arxiv.org/pdf/2506.14458

Macroscopicity of quantum superposition
In this paper, we define a universal measure of macroscopicity $β$ in the form of, ({\em experimentally observed coherence time})/({\em characteristic time required to repeatably distinguish the components of a quantum superposition state}), to divide the quantum/classical (Q-C) boundary. The analysis shows that, for a matter-wave interferometer, covering systems from electron to macromolecular, the measure of its macroscopicity is expressed by $β=pθd/8\hbar$, and it consistently yields $β<…

Adaptive Graph Shrinking for Quantum Optimization of Constrained Combinatorial Problems
Monit Sharma, Hoong Chuin Lau
https://arxiv.org/abs/2506.14250 http…

Adaptive Graph Shrinking for Quantum Optimization of Constrained Combinatorial Problems
A range of quantum algorithms, especially those leveraging variational parameterization and circuit-based optimization, are being studied as alternatives for solving classically intractable combinatorial optimization problems (COPs). However, their applicability is limited by hardware constraints, including shallow circuit depth, limited qubit counts, and noise. To mitigate these issues, we propose a hybrid classical--quantum framework based on graph shrinking to reduce the number of variables …

A Two-stage Optimization Method for Wide-range Single-electron Quantum Magnetic Sensing
Shiqian Guo, Jianqing Liu, Thinh Le, Huaiyu Dai
https://arxiv.org/abs/2506.13469

A Two-stage Optimization Method for Wide-range Single-electron Quantum Magnetic Sensing
Quantum magnetic sensing based on spin systems has emerged as a new paradigm for detecting ultra-weak magnetic fields with unprecedented sensitivity, revitalizing applications in navigation, geo-localization, biology, and beyond. At the heart of quantum magnetic sensing, from the protocol perspective, lies the design of optimal sensing parameters to manifest and then estimate the underlying signals of interest (SoI). Existing studies on this front mainly rely on adaptive algorithms based on bla…

One Polynomial Strategy for Computing Local Projections on Square-Lattice Cluster States
Nyau Fisn, Houren Fu
https://arxiv.org/abs/2506.14257 https://

One Polynomial Strategy for Computing Local Projections on Square-Lattice Cluster States
Quantum computing has attracted a lot of attention in recent years. It is one of the promising candidates for the next-generation computing paradigms. Basically, there are two technical lines to realize quantum computing. One is composing the unitary operators of a few qubits to achieve general unitary operators on an arbitrary number of qubits, known as the approach of quantum circuits. The other one focuses on preparing quantum cluster states and performing the computation by measuring the st…

Replaced article(s) found for quant-ph. https://arxiv.org/list/quant-ph/new
[2/2]:
Quantum Determinant Estimation
https://ar…

Einstein causality of quantum measurements in the Tomonaga-Schwinger picture
Samuel Fedida
https://arxiv.org/abs/2506.14693 https://a…

Einstein causality of quantum measurements in the Tomonaga-Schwinger picture
When quantum measurements are conducted over spacelike-separated regions of spacetime, a natural and commonly assumed physical postulate, called Einstein causality, asserts that they should commute. In this paper, we provide a generalisation to Lüders' rule à la Aharonov-Albert in those globally hyperbolic spacetimes which allow unitarily equivalent Hilbert spaces to be defined along Cauchy hypersurfaces, thus relying on the existence of an interaction picture à la Tomonaga-Schwinger. We sho…

Towards fault-tolerant quantum computation with universal continuous-variable gates
Sheron Blair, Francesco Arzani, Giulia Ferrini, Alessandro Ferraro
https://arxiv.org/abs/2506.13643

Towards fault-tolerant quantum computation with universal continuous-variable gates
Continuous-variable (CV) systems have shown remarkable potential for quantum computation, particularly excelling in scalability and error correction through bosonic encoding. Within this framework, the foundational notion of computational universality was introduced in [Phys. Rev. Lett. 82, 1784 (1999)], and has proven especially successful since it allows for the identification of finite sets of universal CV gates independent of the encoding scheme. However, achieving the critical objective of…

Quantum Entanglement with Geometric Measures
Xuanran Zhu
https://arxiv.org/abs/2506.11453 https://arxiv.org/pdf/2506.11453

Quantum Entanglement with Geometric Measures
Quantifying quantum entanglement is a pivotal challenge in quantum information science, particularly for high-dimensional systems, due to its computational complexity. This thesis extends the geometric measure of entanglement (GME) to introduce and investigate a suite of GME-based entanglement monotones tailored for diverse quantum contexts, including pure states, subspaces, and mixed states. These monotones are applicable to both bipartite and multipartite systems, offering a unified framework…

Dynamically Dressed States of a Quantum Four-Level System
Carolin Calcagno, Friedrich Sbresny, Thomas K. Bracht, Sang Kyu Kim, Eduardo Zubizarreta Casalengua, Katarina Boos, William Rauhaus, Hubert Riedl, Jonathan J. Finley, Doris E. Reiter, Kai M\"uller
https://arxiv.org/abs/2506.14643…

Dynamically Dressed States of a Quantum Four-Level System
In this work, we experimentally and theoretically study the dressed-state emission of the biexciton-exciton cascade in a semiconductor quantum dot under pulsed, resonant, two-photon excitation. Building on the well-characterized steady-state dressed emission of the four-level system, we examine its dynamic counterpart under pulsed, resonant excitation, addressing both experimental observations and theoretical modeling. Here we report several sidebands emerging from the biexciton-to-exciton tran…

Quantum Fisher information from tensor network integration of Lyapunov equation
Gabriela W\'ojtowicz, Susana F. Huelga, Marek M. Rams, Martin B. Plenio
https://arxiv.org/abs/2506.11330

Quantum Fisher information from tensor network integration of Lyapunov equation
The Quantum Fisher Information (QFI) is a geometric measure of state deformation calculated along the trajectory parameterizing an ensemble of quantum states. It serves as a key concept in quantum metrology, where it is linked to the fundamental limit on the precision of the parameter that we estimate. However, the QFI is notoriously difficult to calculate due to its non-linear mathematical form. For mixed states, standard numerical procedures based on eigendecomposition quickly become impracti…

Quantum Circuits for the Metropolis-Hastings Algorithm
Baptiste Claudon, Pablo Rodenas-Ruiz, Jean-Philip Piquemal, Pierre Monmarch\'e
https://arxiv.org/abs/2506.11576

Quantum Circuits for the Metropolis-Hastings Algorithm
Szegedy's quantization of a reversible Markov chain provides a quantum walk whose mixing time is quadratically smaller than that of the classical walk. Quantum computers are therefore expected to provide a speedup of Metropolis-Hastings (MH) simulations. Existing generic methods to implement the quantum walk require coherently computing the acceptance probabilities of the underlying Markov kernel. However, reversible computing methods require a number of qubits that scales with the complexity o…

${\sf QMA}={\sf QMA}_1$ with an infinite counter
Stacey Jeffery, Freek Witteveen
https://arxiv.org/abs/2506.15551 https://arxiv.org/p…

${\sf QMA}={\sf QMA}_1$ with an infinite counter
A long-standing open problem in quantum complexity theory is whether ${\sf QMA}$, the quantum analogue of ${\sf NP}$, is equal to ${\sf QMA}_1$, its one-sided error variant. We show that ${\sf QMA}={\sf QMA}^{\infty}= {\sf QMA}_1^{\infty}$, where ${\sf QMA}_1^\infty$ is like ${\sf QMA}_1$, but the verifier has an infinite register, as part of their witness system, in which they can efficiently perform a shift (increment) operation. We call this register an ``infinite counter'', and compare it t…

Fast and High Excitation Transport in Waveguide Quantum Electrodynamics
Ya-Tang Yu, I Gusti Ngurah Yudi Handayana, Wei Chen, H. H. Jen
https://arxiv.org/abs/2506.11885

Fast and High Excitation Transport in Waveguide Quantum Electrodynamics
Waveguide quantum electrodynamics (wQED) with underlying collective and long-range atom-atom interactions has led to many distinct dynamical phenomena, including modified collective radiations and intriguing quantum correlations. It stands out as a unique platform to illustrate correlated photon transport, as well as to promise applications in quantum information processing. Here we manifest a fast and high atomic excitation transport by employing two well-separated chirally-coupled atomic arra…

Learning Encodings by Maximizing State Distinguishability: Variational Quantum Error Correction
Nico Meyer, Christopher Mutschler, Andreas Maier, Daniel D. Scherer
https://arxiv.org/abs/2506.11552

Learning Encodings by Maximizing State Distinguishability: Variational Quantum Error Correction
Quantum error correction is crucial for protecting quantum information against decoherence. Traditional codes like the surface code require substantial overhead, making them impractical for near-term, early fault-tolerant devices. We propose a novel objective function for tailoring error correction codes to specific noise structures by maximizing the distinguishability between quantum states after a noise channel, ensuring efficient recovery operations. We formalize this concept with the distin…

Relativistic implications of entropy and purity
Joseph Balsells, Martin Bojowald
https://arxiv.org/abs/2506.14705 https://arxiv.org/p…

Relativistic implications of entropy and purity
A quantum object is extended by virtue of quantum uncertainty. Subjected to gravity, it therefore experiences tidal forces and other relativistic effects. As a result, entropy and purity affect geodesic motion and acquire weight, an observation that has broad implications from free-fall experiments to Hawking radiation. If the object's position is quantum correlated in at least two directions, a complete description of its geodesic motion requires non-Riemannian geometry of a form controlled by…

Error-detected coherence metrology of a dual-rail encoded fixed-frequency multimode superconducting qubit
James Wills, Mohammad Tasnimul Haque, Brian Vlastakis
https://arxiv.org/abs/2506.15420

Error-detected coherence metrology of a dual-rail encoded fixed-frequency multimode superconducting qubit
Amplitude damping is a dominant source of error in high performance quantum processors. A promising approach in quantum error correction is erasure error conversion, where errors are converted into detectable leakage states. Dual-rail encoding has been shown as a candidate for the conversion of amplitude-damping errors; with unique sensitivities to noise and decoherence sources. Here we present a dual-rail encoding within a single fixed-frequency superconducting multimode transmon qubit. The th…

Dynamical decoupling of interacting spins through group factorization
Colin Read, Eduardo Serrano-Ens\'astiga, John Martin
https://arxiv.org/abs/2506.15382

Dynamical decoupling of interacting spins through group factorization
Dynamical decoupling (DD) is a well-known open-loop protocol for suppressing unwanted interactions in a quantum system, thereby drastically extending the coherence time of useful quantum states. In the original framework of evolution symmetrization, a DD sequence was shown to enforce a symmetry on the unwanted Hamiltonian, thereby suppressing it if the symmetry was inaccessible. In this work, we show how symmetries already present in the undesired Hamiltonian can be harnessed to reduce the comp…

Leveraging erasure errors in logical qubits with metastable $^{171}$Yb atoms
Bichen Zhang, Genyue Liu, Guillaume Bornet, Sebastian P. Horvath, Pai Peng, Shuo Ma, Shilin Huang, Shruti Puri, Jeff D. Thompson
https://arxiv.org/abs/2506.13724

Leveraging erasure errors in logical qubits with metastable $^{171}$Yb atoms
Implementing large-scale quantum algorithms with practical advantage will require fault-tolerance achieved through quantum error correction, but the associated overhead is a significant cost. The overhead can be reduced by engineering physical qubits with fewer errors, and by shaping the residual errors to be more easily correctable. In this work, we demonstrate quantum error correcting codes and logical qubit circuits in a metastable ${}^{171}$Yb qubit with a noise bias towards erasure errors,…

SYK model based $\beta$ regime dependent two-qubit dynamical wormhole-inspired teleportation protocol simulation
Sudhanva Joshi, Sunil Kumar Mishra
https://arxiv.org/abs/2506.15373

SYK model based $β$ regime dependent two-qubit dynamical wormhole-inspired teleportation protocol simulation
This study aims to provide insights into various aspects of quantum chaos and teleportation by implementing the recently developed Wormhole-Inspired Teleportation Protocol (WITP). We commence by constructing an analog of a traversable wormhole utilizing the Sachdev-Ye-Kitaev (SYK) model in conjunction with the Thermofield Double (TFD) state framework, implemented within a quantum circuit. Subsequently, we manipulate various parameters, including temperature ($β$) and the location of the messag…

Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance
Jianwen Xu, Xiang Deng, Wen Zheng, Wenchang Yan, Tao Zhang, Zhenchuan Zhang, Wanli Huang, Xiaoyu Xia, Xudong Liao, Yu Zhang, Jie Zhao, Shaoxiong Li, Xinsheng Tan, Dong Lan, Yang Yu
https://arxiv.org/abs/2506.14128

Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance
The transmon, a fabrication-friendly superconducting qubit, remains a leading candidate for scalable quantum computing. Recent advances in tunable couplers have accelerated progress toward high-performance quantum processors. However, extending coherent interactions beyond millimeter scales to enhance quantum connectivity presents a critical challenge. Here, we introduce a hybrid-mode coupler exploiting resonator-transmon hybridization to simultaneously engineer the two lowest-frequency mode, e…

Variational quantum algorithms with invariant probabilistic error cancellation on noisy quantum processors
Yulin Chi, Hongyi Shi, Wen Zheng, Haoyang Cai, Yu Zhang, Xinsheng Tan, Shaoxiong Li, Jianwei Wang, Jiangyu Cui, Man-Hong Yung, Yang Yu
https://arxiv.org/abs/2506.07039

Variational quantum algorithms with invariant probabilistic error cancellation on noisy quantum processors
In the noisy intermediate-scale quantum era, emerging classical-quantum hybrid optimization algorithms, such as variational quantum algorithms (VQAs), can leverage the unique characteristics of quantum devices to accelerate computations tailored to specific problems with shallow circuits. However, these algorithms encounter biases and iteration difficulties due to significant noise in quantum processors. These difficulties can only be partially addressed without error correction by optimizing h…

Chiral Symmetries and Multiparticle Entanglement
Sophia Denker, Satoya Imai, Otfried G\"uhne
https://arxiv.org/abs/2506.15609 https://

Chiral Symmetries and Multiparticle Entanglement
Bosons and fermions are defined by their exchange properties and the underlying symmetries determine the structure of the corresponding state spaces. For two particles there are two possible exchange symmetries, resulting in symmetric or antisymmetric behaviour, but when exploring multiparticle systems also quantum states with chiral symmetries appear. In this work we demonstrate that chiral symmetries lead to extremal forms of quantum entanglement. More precisely, we show that subspaces with t…

Toward Scalable Quantum Compilation for Modular Architecture: Qubit Mapping and Reuse via Deep Reinforcement Learning
Sokea Sang, Leanghok Hour, Youngsun Han
https://arxiv.org/abs/2506.09323

Toward Scalable Quantum Compilation for Modular Architecture: Qubit Mapping and Reuse via Deep Reinforcement Learning
Modular quantum architectures have emerged as a promising approach for scaling quantum computing systems by connecting multiple Quantum Processing Units (QPUs). However, this approach introduces significant challenges due to costly inter-core operations between chips and quantum state transfers, which contribute to noise and quantum decoherence. This paper presents QARMA, a novel Qubit mapping using Attention-based deep Reinforcement learning (DRL) for Modular quantum Architectures, along with …

Quantum Resource Complementarity in Finite-Dimensional Systems
Justin K. Edmondson
https://arxiv.org/abs/2506.11741 https://arxiv.org…

Quantum Resource Complementarity in Finite-Dimensional Systems
Quantum resources such as entanglement, information redundancy, and coherence enable revolutionary advantages but obey fundamental tradeoffs. We present a unified geometric constraint governing three core operational tasks: teleportation ($q_1$), cloning ($q_2$), and coherence-based metrology ($q_3$). For any tripartite quantum state $ρ_{ABC}$, we show the tight inequality $q_1^2 + q_2^2 + q_3^2 \leq 1$ confines all physically achievable resources to the positive octant of the unit ball. This …

Completeness Stability of Quantum Measurements
Rakesh Saini, Jukka Kiukas, Daniel Burgarth, Alexei Gilchrist
https://arxiv.org/abs/2506.11539 https://

Completeness Stability of Quantum Measurements
We introduce a resource monotone, the completeness stability, to quantify the quality of quantum measurements within a resource-theoretic framework. By viewing a quantum measurement as a frame, the minimum eigenvalue of a frame operator emerges as a significant monotone. It captures bounds on estimation errors and the numerical stability of inverting the frame operator to calculate the optimal dual for state reconstruction. Maximizing this monotone identifies a well-characterized class of quant…

Entangled states from quantum algebra $\mathcal{U}_h (\mathfrak{sl}(2, \mathbb{R}))$
A. Ballesteros, J. J. Relancio, L. Santamar\'ia-Sanz
https://arxiv.org/abs/2506.11686

Entangled states from quantum algebra $\mathcal{U}_h (\mathfrak{sl}(2, \mathbb{R}))$
We discuss the application of the Jordanian quantum algebra $\mathcal{U}_h (\mathfrak{sl}(2, \mathbb{R}))$, as a Hopf algebra deformation of the Lie algebra $\mathfrak{sl}(2, \mathbb{R})$, in the context of entanglement properties of quantum states. For them, several kind of entanglement measures and fidelities are obtained, parametrized by the deformation parameter $h$. In particular, we construct the associated $h$-deformed Dicke states on $\mathfrak{sl}(2, \mathbb{R})$, comparing them to the…

Quantum correlations in molecular cavity optomechanics
E. Kongkui Berinyuy, D. R. Kenigoule Massembele, P. Djorwe, R. Altuijri, M. R. Eid, A. -H. Abdel-Aty, S. G. Nana Engo
https://arxiv.org/abs/2506.07277

Quantum correlations in molecular cavity optomechanics
In quantum information, quantum correlations--particularly entanglement, EPR steering, and quantum discord--stand as interesting resources, powering breakthroughs from secure communication and quantum teleportation to efficient quantum computation. Here, we unveil a theoretical framework for generating and controlling these vital quantum phenomena within a double-cavity molecular optomechanical (McOM) system. This innovative approach leverages strong interactions between confined optical fields…

Quantum transduction via generalized continuous-variable teleportation
Quntao Zhuang
https://arxiv.org/abs/2506.06899 https://arxiv.o…

Quantum transduction via generalized continuous-variable teleportation
Quantum transduction converts quantum states between different frequencies. Similarly, quantum teleportation transfers quantum states between different systems. While often appreciated for quantum communication between distant locations, teleportation can also operate between different frequencies. In terms of bosonic modes, quantum teleportation relies on two-mode squeezing -- squeezed on the balanced Einstein-Podolsky-Rosen (EPR) quadratures -- for entanglement and a balanced beamsplitter plu…

Physics-inspired neural networks as quasi inverse of quantum channels
Sameen Aziz, Muhammad Faryad
https://arxiv.org/abs/2506.11716 https://

Physics-inspired neural networks as quasi inverse of quantum channels
Quantum channels are not invertible in general. A quasi-inverse allows for a partial recovery of the input state, but its analytical results are found only in a restricted space of its parameters. This work explores the potential of neural networks to find the quasi-inverse of qubit channels for any values of the channel parameters while keeping the quasi-inverse as a physically realizable quantum operation. We introduce a physics-inspired loss function based on the mean of the square of the mo…

Quantum secret sharing in a triangular superconducting quantum network
Haoxiong Yan, Allen Zang, Joel Grebel, Xuntao Wu, Ming-Han Chou, Gustav Andersson, Christopher R. Conner, Yash J. Joshi, Shiheng Li, Jacob M. Miller, Rhys G. Povey, Hong Qiao, Eric Chitambar, Andrew N. Cleland
https://arxiv.org/abs/2506.10878

Quantum secret sharing in a triangular superconducting quantum network
We present a three-node quantum communication testbed with a triangular topology, each side of the triangle formed by a 1.3-meter-long transmission line. We demonstrate state transfer and entanglement generation between any two nodes, generate genuine multipartite entangled GHZ states, and implement quantum secret sharing (QSS) of classical information. Our experiments show that the QSS protocol can effectively detect eavesdropping, ensuring the secure sharing of secrets. This device forms a te…

Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems
Irene Ada Picatoste, Alessandra Colla, Heinz-Peter Breuer
https://arxiv.org/abs/2506.11633

Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems
We study the nonequilibrium thermodynamics of pure decoherence processes in open quantum systems coupled to a thermal reservoir. We review various definitions of central quantities, such as internal energy, work, heat and entropy production, developed within local and global approaches to quantum thermodynamics. Within local approaches thermodynamic quantities only refer to the open system's degrees of freedom, while in the global approaches certain quantities are defined by referring explicitl…