Quantum Computing
Quantum Computing news — Friday 23 October 2026
135 stories from 3 sources, every one in English. Each links to its publisher.
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RhymeQ Joins NVIDIA Inception Program and Announces Technical Collaboration on NOOA Agentic AI Framework
Quantum Computing Report
RhymeQ Technologies has joined the NVIDIA Inception program, aligning its RHYME abstraction layer with NVIDIA's CUDA-Q platform. They are also collaborating on research to integrate agentic AI with quantum computing using NVIDIA's NOOA…
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Telefónica and IQM to Deploy Community of Madrid’s First On-Premises Quantum Computer at Universidad Politécnica de Madrid
Quantum Computing Report
Telefónica and IQM Quantum Computers are deploying the first quantum computer in the Community of Madrid, an IQM Spark system at Universidad Politécnica de Madrid (UPM) by late 2026. This is their third quantum processor in Spain, aiming…
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Governor Hochul Announces New Study Highlighting New York’s Position as a National Leader in Quantum Technology
The Quantum Insider
Insider Brief A state-commissioned study ranks New York second nationally in quantum-related businesses, research groups and patents, identifying greater coordination as an opportunity to accelerate commercialization. New York has…
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Guest Post: Quantum Computing’s Next Phase May Be Driven by Compounding Breakthroughs
The Quantum Insider
Guest Post by Liam Wang COO, Logical Qubit Technology. The World Economic Forum’s Quantum Economy Day 2026 was held in Geneva, Switzerland, on October 13–14. Logical Qubit Technology attended as the only quantum computing company…
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IQM and Telefónica Plan Quantum Computer for Madrid University
The Quantum Insider
Insider Brief Telefónica and IQM Quantum Computers plan to install the first quantum computer in Spain’s Community of Madrid at the Technical University of Madrid (UPM) before the end of 2026. The IQM Spark system is designed for research…
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Quandela And Quanova Partner to Deploy Vietnam’s First Quantum Computer
The Quantum Insider
Insider Brief Quanova has selected Quandela ’s MosaiQ photonic system for a program at Quang Trung University that the partners say will deploy Vietnam’s first quantum computer. Supported by Nam A Bank, the initiative includes faculty…
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Google Launches $150,000 AI Competition to Reduce Quantum Computing Demands
The Quantum Insider
Insider Brief Google Quantum AI launched a $150,000 Kaggle competition to develop smaller, more efficient quantum circuits for calculations related to fusion energy, optimization and chemistry. Participants will reduce qubit and gate…
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Brazil’s Inteli Becomes Accredited ICT and Partners with IBM Quantum to Research Decision-Making Under Uncertainty
Quantum Computing Report
Inteli, a Brazilian higher education institute, has become an accredited ICT and partnered with IBM Quantum. This collaboration grants Inteli researchers cloud access to IBM Quantum systems to explore quantum algorithms for decision-making…
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Google Quantum AI Launches $150K Kaggle Competition to Compress Fault-Tolerant Quantum Circuits Using AI Agents
Quantum Computing Report
Google Quantum AI has launched a $150,000 Kaggle competition running from October 22, 2026, to January 20, 2027. The competition challenges participants to use AI agents to compress fault-tolerant quantum circuits, focusing on "kickmix"…
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Florida Atlantic University Awarded $400,000 NSF Grant to Expand Post-Quantum Cryptographic Protocols
Quantum Computing Report
Florida Atlantic University received a nearly $400,000 NSF grant to advance post-quantum cryptographic protocols. Led by Dr. Edoardo Persichetti and Dr. Veronika Kuchta, the project will develop advanced functionalities beyond basic…
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Leiden University and Riverlane Research Reveals Distance-Losing Flaw in Correlated Decoding Below Threshold
Quantum Computing Report
Leiden University and Riverlane research uncovered a flaw in correlated decoding, causing a loss of effective code distance and higher logical failure rates in quantum error correction. They introduced a new regularization parameter to fix…
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Geometric characterization of non-Gaussian entanglement for finite stellar rank states
arXiv quant-ph
arXiv:2511.02076v3 Announce Type: replace Abstract: We introduce a general framework for the analysis of non-Gaussian entanglement in bosonic states of finite stellar rank. The central result is the full characterization of their…
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High-fidelity and robust controlled-Z gates for superconducting transmon qubits. II. System-parameter uncertainties and overall errors
arXiv quant-ph
arXiv:2610.30681v1 Announce Type: new Abstract: In the companion paper (Part I), we developed an optimal-control framework to suppress intrinsic and decoherence-induced errors in controlled-Z (CZ) gates between directly coupled…
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Reducing QPU Calls in Variational Quantum Algorithms via Classical Offloading of Gradient Computation
arXiv quant-ph
arXiv:2503.16361v3 Announce Type: replace Abstract: Variational quantum algorithms (VQAs) are a promising approach for leveraging near-term quantum computers, but trainability and quantum-resource costs remain major challenges. Here we…
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FVQKD: A Formal Verification of Quantum Key Distribution Security in Rocq
arXiv quant-ph
arXiv:2610.30645v1 Announce Type: new Abstract: Quantum key distribution (QKD), whose security is derived from quantum mechanics rather than computational assumptions, is moving into standardization and commercial deployment. Yet its…
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Optimal Average Success Probabilities of Binary $(n,n-1)$ and $(n,n-2)$ Quantum Random Access Codes
arXiv quant-ph
arXiv:2607.10414v2 Announce Type: replace Abstract: A binary $(n,m)$ quantum random access code (QRAC) compresses an $n$-bit classical string into an $m$-qubit quantum state, from which a decoder attempts to recover a randomly selected…
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Scale-free localization in pseudo-Hermitian quantum walk
arXiv quant-ph
arXiv:2610.31067v1 Announce Type: new Abstract: Scale-free localization is a distinctive phenomenon in non-Hermitian systems, where specific eigenstates, known as scale-free localized states (LSs), possess localization lengths that scale…
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Engineering Quantum-Enhanced Transport by Supertransfer
arXiv quant-ph
arXiv:2506.05045v2 Announce Type: replace Abstract: Collective behaviour of the components of a quantum system can significantly alter the rates of dynamical processes within the system. A paradigmatic collective effect is superradiance…
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Quantum Reversibility Meets Classical Reverse Diffusion
arXiv quant-ph
arXiv:2510.18512v3 Announce Type: replace Abstract: Bayes' rule connects forward and reverse processes in classical probability theory, and its quantum analogue has been discussed in terms of the Petz (transpose) map. For quantum dynamics…
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A unified framework for data-driven Bell inequalities
arXiv quant-ph
arXiv:2601.07686v2 Announce Type: replace Abstract: Although the original EPR paradox was formulated in terms of position and momentum, most studies of these phenomena have focused on measurement scenarios with only a discrete number of…
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Diffusive Stochastic Master Equation (SME) with dispersive qubit/cavity coupling
arXiv quant-ph
arXiv:2509.18925v3 Announce Type: replace Abstract: We provide a detailed analysis of the quantum diffusive Stochastic Master Equation~(SME) for qubit/cavity systems with dispersive coupling, incorporating classical input signals and…
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Impossible to conjugate or reflect an unknown quantum state via a unitary evolution
arXiv quant-ph
arXiv:2609.11536v2 Announce Type: replace Abstract: The no-cloning theorem, the no-deleting theorem, and other no-go theorems play a crucial role in quantum mechanics and quantum information. In this paper, we show that it is impossible to…
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Time-reversal-based quantum metrology in a central-spin architecture: from SATIN to butterfly echo
arXiv quant-ph
arXiv:2610.30686v1 Announce Type: new Abstract: We investigate quantum-enhanced time-reversal-based metrology using the central spin model, in which a single ancilla spin of magnitude $S_{\rm cen}$ mediates interactions between $N$ bath…
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Quantum Constrained Hamiltonian Descent
arXiv quant-ph
arXiv:2610.31170v1 Announce Type: new Abstract: We propose Quantum Constrained Hamiltonian Descent (QCHD), a continuous-time quantum framework for optimization under smooth equality constraints. The unconstrained counterpart, Quantum…
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Corrections induced by the GUP to the Lamb shift of an accelerated atom interacting with a quantum scalar field
arXiv quant-ph
arXiv:2608.26914v2 Announce Type: replace Abstract: We investigate the effect of the GUP on the Lamb shift of a two-level atom interacting with a real massless scalar quantum field, within the DDC formalism. For an atom undergoing inertial…
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Orbital-coherence memory in electrical transport and its self-consistent Maxwell response
arXiv quant-ph
arXiv:2610.31390v1 Announce Type: cross Abstract: An internal electronic coherence changes electrical transport only when it feeds back on the physical current. We develop a reduced description of this feedback and distinguish its exact…
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Exact Resource Laws for Passive Wavelength Routing in Entanglement Networks
arXiv quant-ph
arXiv:2608.29911v2 Announce Type: replace Abstract: Entanglement-based networks provide a scalable framework for multiuser quantum communication by passively routing spectrally correlated photon pairs across interconnected nodes. Several…
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The strengthened quantum Hamming bound of Yu, Lai, and Oh
arXiv quant-ph
arXiv:2610.30088v2 Announce Type: replace Abstract: We prove a conjecture of Yu, Lai, and Oh: their strengthened quantum Hamming bounds, a family that interpolates between Hamming-type bounds and the Singleton bound, hold for all quantum…
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Scalable Neural Wave Functions via Information Mixing and Hierarchical Network Architectures
arXiv quant-ph
arXiv:2610.30257v1 Announce Type: new Abstract: Numerically simulating quantum many-body systems is one of the central challenges in modern physics, as the exponential growth of the Hilbert space with system size renders large-scale exact…
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Reset-Enhanced Dissipative Quantum Metrology
arXiv quant-ph
arXiv:2610.31249v1 Announce Type: new Abstract: Quantum metrology is ultimately shaped not only by measurements, but also by the dissipative dynamics that prepare and maintain the probe. Nevertheless, a general mechanism for enhancing both…
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The Impact of Markovian Errors on Random Circuits
arXiv quant-ph
arXiv:2610.31500v1 Announce Type: new Abstract: Randomized benchmarking (RB) returns a single decay parameter or gate error rate, but when the noise is gate-dependent that parameter is notoriously difficult to interpret. We study RB and…
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Non-adiabatic Optimisation via Localisation-Delocalisation Transitions
arXiv quant-ph
arXiv:2610.30301v1 Announce Type: cross Abstract: The promise of efficiently solving classical optimisation problems on quantum computers is tantalizing. As many such problems can be mapped to approximating the ground state of…
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Screening strongly correlated materials in solid oxide cells with quantum simulation
arXiv quant-ph
arXiv:2610.31591v1 Announce Type: new Abstract: We develop an end-to-end framework for assessing a quantum-computing application in industrial materials science: the screening of strongly correlated oxygen-electrode materials for SOFCs and…
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Structured Unitary Tensor Network Representations for Circuit-Efficient Quantum Data Encoding
arXiv quant-ph
arXiv:2602.16266v2 Announce Type: replace Abstract: Encoding classical data into quantum states is a central bottleneck in quantum machine learning: many widely used encodings are circuit-inefficient, requiring deep circuits and…
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The General Quantum Limit for and the Optimization of the Minimum Measurable Frequency Shift in a Laser
arXiv quant-ph
arXiv:2607.10518v3 Announce Type: replace Abstract: We show that, contrary to conventional understanding, the minimum measurable frequency shift (MMFS) for a single-mode ideal laser is determined by a combination of phase diffusion caused…
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Pure states are optimal for total energy-constrained quantum channel discrimination
arXiv quant-ph
arXiv:2610.30295v1 Announce Type: new Abstract: We consider the discrimination of two quantum channels acting on bosonic modes, with a probe state of fixed mean photon number and no ancilla. We prove that pure probes are optimal: for every…
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Dealing with low-weight errors that lead BP OSD to fail
arXiv quant-ph
arXiv:2610.30305v1 Announce Type: new Abstract: Belief Propagation combined with Ordered Statistics Decoding (BP OSD) is an open-source decoding tool used widely within the community due to its versatility and ease of application to…
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On the Structure of Quantum Finite-Level Systems: Decoherence-Free Subsystems, Quantum Nondemolition Variables, and Back-Action-Evading Measurements
arXiv quant-ph
arXiv:2610.30616v1 Announce Type: new Abstract: The purpose of this paper is to conduct a comprehensive structural analysis of quantum finite-level systems in the Heisenberg picture, where the evolution of system observables is modeled by…
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Fluctuation-free Quantum Battery Charging Enabled by Bell-like Entangled and Separable Charger States
arXiv quant-ph
arXiv:2610.31242v1 Announce Type: new Abstract: The implication of entanglement in quantum battery charging remains poorly understood. In addition, intrinsic quantum randomness poses a fundamental challenge to charging uniformity across…
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High-fidelity entanglement of two spectrally-distinct solid state emitters
arXiv quant-ph
arXiv:2610.31283v1 Announce Type: new Abstract: Solid state quantum emitters with electronic spin properties can be entangled using optical interferometric which-path erasure techniques that rely on identical frequencies and linewidths of…
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Finite Systems in the Space of Projective Measurements
arXiv quant-ph
arXiv:2610.31359v1 Announce Type: new Abstract: We investigate the dynamics of two-level systems using the quasidistribution $Q$ function projected onto the space of collective measurements. Particular attention is given to evolution under…
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Qubits Are Not Enough: Deflation and Measurement Limits in Variational Quantum Modal Analysis
arXiv quant-ph
arXiv:2610.31393v1 Announce Type: new Abstract: Amplitude encoding stores an N-degree-of-freedom structural mode using ceiling(log2 N) qubits. This article develops an evaluation framework for variational quantum eigensolvers in…
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Size-independent Logarithmic Sobolev Inequalities for Quantum Gibbs Samplers
arXiv quant-ph
arXiv:2610.31571v1 Announce Type: new Abstract: We propose a new method for proving $L^2$ and modified logarithmic Sobolev inequalities with constants independent of system size for quantum Gibbs samplers whose Lindblad generators satisfy…
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Strongly Regular Graph Construction via Quadratic Binary Optimization
arXiv quant-ph
arXiv:2610.30142v1 Announce Type: cross Abstract: Strongly regular graphs, hereafter SRGs, are highly structured combinatorial objects of central interest in algebraic graph theory and quantum information, whose explicit construction…
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Enhanced Whispering Gallery Mode Phase Shift using Indistinguishable Photon Pairs
arXiv quant-ph
arXiv:2404.17409v2 Announce Type: replace Abstract: We present a theoretical investigation of a whispering gallery mode (WGM) resonator coupled to a Mach-Zehnder interferometer (MZI) and show a bimodal coincidence transmission spectrum…
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Macroscopic quantum coherence and entanglement in mechanical systems
arXiv quant-ph
arXiv:2503.08324v3 Announce Type: replace Abstract: The notion of a macroscopic quantum state must be pinned down in order to assess how well experiments probe the large-scale limits of quantum mechanics. However, the issue of quantifying…
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Sparse SYK quantum batteries: Boosting quantum efficiency by reducing complexity
arXiv quant-ph
arXiv:2505.17679v3 Announce Type: replace Abstract: In the context of energy storage at the nanoscale, exploring the notion of quantum advantage implies walking on the thin line at the boundary between quantum mechanics and thermodynamics…
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Rigorous error bounds for dissipative thermal state preparation from weak system-bath coupling
arXiv quant-ph
arXiv:2605.03011v2 Announce Type: replace Abstract: Thermal state preparation is a central challenge in the simulation of quantum many-body systems. Yet, provably efficient algorithms for this task were only introduced recently [Chen et…
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Finite-Shot Operating Windows for Virtual Distillation and Symmetry Verification
arXiv quant-ph
arXiv:2606.15464v3 Announce Type: replace Abstract: Quantum error mitigation methods are usually compared by their infinite-shot bias, yet in an experiment the comparison is decided by a finite shot budget, by the instability of the…
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Worst-Case Quantum Algorithm for Optimal Polynomial Intersection Beyond Decoded Quantum Interferometry
arXiv quant-ph
arXiv:2607.14650v2 Announce Type: replace Abstract: The Optimal Polynomial Intersection (OPI) problem asks us to find a low-degree polynomial over a finite field whose values lie in prescribed subsets on as many given inputs as possible…
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Minimal Scenarios Witnessing Genuine Multipartite Nonlocality Possibilistically
arXiv quant-ph
arXiv:2610.11377v2 Announce Type: replace Abstract: We study a strong form of genuine multipartite nonlocality (GMNL), where an $n$-partite scenario admits a quantum strategy generating outcomes belonging to a restricted set with…
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Transversal syndrome extraction: A unifying construction for measuring the error syndromes of any stabilizer code
arXiv quant-ph
arXiv:2610.30279v1 Announce Type: new Abstract: Fault-tolerant syndrome extraction is fundamental to stabilizer-code-based quantum error correction, yet existing general protocols incur substantial costs in either circuit depth or width…
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A simple proof of unitary parallelization via port-based teleportation
arXiv quant-ph
arXiv:2610.30761v1 Announce Type: new Abstract: Port-based teleportation (PBT) is a variant of quantum teleportation that does not require corrections on the teleported state: starting with $N$ shared EPR states, Alice can teleport a qudit…
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Molecular analogue for scalar dynamics in an AII metric
arXiv quant-ph
arXiv:2511.11379v2 Announce Type: replace-cross Abstract: Tachyons are hypothetical particles that propagate faster than light, yet they have never been observed in nature or in the laboratory. In this work, we introduce the $H_2^+$…
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Automating quantum circuit optimization with AI agents
arXiv quant-ph
arXiv:2610.31352v1 Announce Type: new Abstract: Compiling quantum algorithms for real devices involves hard optimization problems that can decide whether an algorithm runs at scale. We present a general method for solving such problems…
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In-Situ Differential-Light-Shift Cancellation for Trapped-Atom Clocks
arXiv quant-ph
arXiv:2603.26398v2 Announce Type: replace-cross Abstract: Differential light shifts (DLS) induced by optical trapping fields fundamentally limit the stability and accuracy of trapped-atom microwave clocks. We demonstrate an in-situ method…
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Realization of a Superleak in a Quantum Gas
arXiv quant-ph
arXiv:2610.31185v1 Announce Type: cross Abstract: Ultracold quantum gases offer a controllable and microscopically accessible platform for understanding and engineering superfluidity. Yet, realizing a superleak that selectively transports…
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On the Role of Problem Structure in Single-Layer QAOA
arXiv quant-ph
arXiv:2610.30511v1 Announce Type: new Abstract: Problem structure is regarded as a key factor influencing the performance of the Quantum Approximate Optimization Algorithm (QAOA), yet it remains an informal notion without a precise…
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Extreme competition between stripes and superconductivity in the hole-doped Hubbard model
arXiv quant-ph
arXiv:2610.30321v1 Announce Type: cross Abstract: The two-dimensional Hubbard model was originally proposed as the minimal model of uniform $d$-wave superconductivity in the cuprate high-temperature superconductors, but recent calculations…
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Noncontextuality inequalities for prepare-transform-measure scenarios
arXiv quant-ph
arXiv:2407.09624v3 Announce Type: replace Abstract: We provide the first systematic technique for deriving witnesses of contextuality in prepare-transform-measure scenarios. More specifically, we show how linear quantifier elimination can…
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Bounds on Attainable Rate Modulation in Fermi's Golden Rule
arXiv quant-ph
arXiv:2610.29404v2 Announce Type: replace Abstract: Controlling transition rates is a central objective across quantum optics, condensed-matter physics, and chemical physics, encompassing processes such as spontaneous emission, energy and…
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Exact WKB analysis of inverted triple-well: resonance, PT-symmetry breaking, and resurgence
arXiv quant-ph
arXiv:2604.05878v3 Announce Type: replace-cross Abstract: We study non-Hermitian quantum mechanics of an inverted triple-well potential within the exact WKB framework. For a single classical potential, different Siegert boundary conditions…
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Problem-aware sampling for bias and variance reduction in randomised Hamiltonian simulation
arXiv quant-ph
arXiv:2610.31515v1 Announce Type: new Abstract: Randomised quantum simulation algorithms such as qDRIFT reduce circuit depth by replacing deterministic product formulas with stochastic compilations, but achieving high accuracy can require…
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The often overlooked role of sound in liquid thermal transport
arXiv quant-ph
arXiv:2610.31127v1 Announce Type: cross Abstract: Formulated a hundred years ago, the Bridgman formula for thermal conductivity of liquids postulates a proportionality between sound velocity and thermal conductivity. This designates…
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Mode-Selective Micromotion Compensation via Coherent Excitation of a Ground-State-Cooled Motional Mode
arXiv quant-ph
arXiv:2610.30614v1 Announce Type: new Abstract: Excess micromotion induced by stray DC electric fields limits the control fidelity of trapped-ion experiments. Various techniques have been developed to detect and compensate ion…
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Nonlinear quantum noise polarization in macroscopic nonlinear QED
arXiv quant-ph
arXiv:2610.31406v1 Announce Type: new Abstract: We construct a quantum theory of light in nonlinearly responding materials with dispersion and absorption and, in particular, show the emergence of non-Gaussian noise associated with…
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Predictive electronic feedback control for narrow-linewidth lasers
arXiv quant-ph
arXiv:2610.31396v1 Announce Type: cross Abstract: Narrow-linewidth lasers are essential for various key atom-laser interaction processes and optical setups in quantum coherent control, quantum precision measurement, and quantum information…
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Hall's Exact Uncertainty Relation and the Geometry of Krylov-Space Operator Dynamics
arXiv quant-ph
arXiv:2512.20359v3 Announce Type: replace Abstract: Krylov representations of operator dynamics encode two inequivalent motions: probability transport along the discrete Krylov chain and motion of the normalized amplitude vector on the…
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Rank-One Loss Maximizes the Spectral Response Strength of Passive Full-Order Exceptional Points
arXiv quant-ph
arXiv:2610.31268v1 Announce Type: new Abstract: We consider finite-dimensional non-Hermitian systems in which all modes coalesce at a single exceptional point. For a rank-one anti-Hermitian contribution, the spectral response strength is…
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Continuous Measurement of Quantum Axion Dark Matter
arXiv quant-ph
arXiv:2610.30250v1 Announce Type: cross Abstract: We provide a fully quantum-mechanical description of the continuous measurement of wavelike dark matter. Our focus is cavity haloscopes, although our results inform a broad range of axion…
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Nanopillar metasurfaces uniting high optical reflectivity with ultracoherent nanomechanics
arXiv quant-ph
arXiv:2610.31452v1 Announce Type: cross Abstract: Mechanically compliant mirrors are key components in cavity optomechanics. However, the requirements to achieve the best optical and mechanical performance are usually in direct…
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Multi-FPGA Synchronization and Data Communication for Quantum Control and Measurement
arXiv quant-ph
arXiv:2506.09856v2 Announce Type: replace Abstract: Quantum computing has grown from novel physics experiments with a few qubits controlled by a single controller to systems with qubit counts that require multiple controllers working in…
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Imaginary-time-enhanced feedback-based quantum algorithms for universal ground-state preparation
arXiv quant-ph
arXiv:2512.13044v2 Announce Type: replace Abstract: Preparing ground states of strongly correlated quantum systems is a central goal in quantum simulation and optimization. The feedback-based quantum algorithm (FALQON) provides an…
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Hamiltonian and double-bracket flow formulations of quantum measurements
arXiv quant-ph
arXiv:2512.15412v3 Announce Type: replace Abstract: We introduce a framework that unifies quantum measurement dynamics, Hamiltonian dynamics, and double-bracket gradient flows. We do so by providing explicit expressions for stochastic…
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Integral representations of quantum R\'enyi divergences on von Neumann algebras
arXiv quant-ph
arXiv:2608.21214v2 Announce Type: replace Abstract: We prove an integral representation of the $\alpha$-$z$ R\'enyi divergences for normal states on arbitrary von Neumann algebras. Along each ray $z=c\alpha$, the divergence is a positive…
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Exact few-magnon Bethe scars of the non-integrable alternating Heisenberg chain
arXiv quant-ph
arXiv:2501.14017v2 Announce Type: replace-cross Abstract: Exact solutions of quantum lattice models serve as useful guides for interpreting physical phenomena in condensed matter systems. Prominent examples of integrability appear in one…
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A Personal History in Quantum Foundations: an Oral History Interview
arXiv quant-ph
arXiv:2610.30998v1 Announce Type: cross Abstract: This oral history interview provides Yakir Aharonov's personal and conceptual recollections from the 1950s to the 2000s, focusing on his academic trajectory, some of his major contributions…
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Probing quasiperiodic spectral accessibility with a finite-rate quantum Otto cycle
arXiv quant-ph
arXiv:2610.30555v1 Announce Type: new Abstract: Quasiperiodic systems combine sharply different spectral and localisation regimes with a dense hierarchy of dynamical time scales. We show that a finite-rate quantum Otto cycle can use this…
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Space-Time Optimisations for Early Fault-Tolerant Quantum Computation
arXiv quant-ph
arXiv:2511.08848v2 Announce Type: replace Abstract: Fault-tolerance is the future of quantum computing, ensuring error-corrected quantum computation that can be used for practical applications. Resource requirements for fault-tolerant…
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Many-body localization
arXiv quant-ph
arXiv:2604.12464v2 Announce Type: replace Abstract: We present an introductory review of nonergodic dynamics in interacting many-body quantum systems, focusing on the phenomenon of many-body localization (MBL). We describe aspects of MBL…
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Lean-QuantumAlg: A Framework for AI Agents to Produce Quantum Algorithms that Humans Can Trust
arXiv quant-ph
arXiv:2610.30216v1 Announce Type: new Abstract: AI agents are increasingly capable of constructing quantum algorithms and proofs, yet machine-checked proofs alone cannot guarantee that the intended problem is solved or that resource claims…
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Distributed dual-comb spectroscopy
arXiv quant-ph
arXiv:2610.30462v1 Announce Type: new Abstract: We propose distributed dual-comb spectroscopy, a quantum-enhanced sensing architecture that simultaneously exploits spatial- and spectral-domain entanglement to improve the extraction of…
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Computational reach of machine learning models is independent of untrained quantum resources
arXiv quant-ph
arXiv:2309.13967v4 Announce Type: replace Abstract: This paper proves that if an untrained quantum circuit is used as a resource in a machine learning model, then on average no resource quantum circuit is better than any other that can…
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Quantum f-divergences from retrodictive tests: a unifying classical variational principle
arXiv quant-ph
arXiv:2610.29696v2 Announce Type: replace Abstract: The same classical f-divergence admits inequivalent extensions to quantum states. The question is whether these extensions can be obtained from a common classical variational principle…
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Norm-Aware Product Formulas for Hamiltonian Simulations
arXiv quant-ph
arXiv:2610.31070v1 Announce Type: new Abstract: With the target of efficiently solving the quantum-mechanical Schr\"odinger equation on future quantum computers, first- and second-order product formulas for the time-evolution operator are…
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What does quantum parameter estimation estimate? A no-go result for true quantity values
arXiv quant-ph
arXiv:2610.31632v1 Announce Type: new Abstract: We examine the conditions under which quantum parameter estimation is compatible with the concept of a ``true'' quantity value: a unique value of the estimated quantity that exists prior to…
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Searching for Ultralight Dark Matter with MOLeQuTE: a Massive Optically Levitated Quantum Tabletop Experiment
arXiv quant-ph
arXiv:2512.00166v3 Announce Type: replace-cross Abstract: Many well theoretically motivated models of ultralight dark matter are expected to give rise to feeble oscillatory forces on macroscopic objects. Optically trapped sensors have high…
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Roto-Reflection Geometry of Pure Two-Qubit Entanglement
arXiv quant-ph
arXiv:2606.12637v2 Announce Type: replace Abstract: Pure two-qubit entanglement is usually characterized by scalar quantities such as concurrence. Here we show that it also has a natural geometric form. In the Pauli correlation tensor…
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Delta-Doped GeV$^-$ in diamond with isotope resolvable optical spectra
arXiv quant-ph
arXiv:2610.30375v1 Announce Type: new Abstract: Group IV color centers in diamond -- silicon, germanium, tin, and lead-vacancy centers -- are a promising platform for quantum networking. Typical Group-IV creation utilizes ion implantation…
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Mixed State Deep Thermalization under Generic Quantum Errors
arXiv quant-ph
arXiv:2610.31580v1 Announce Type: new Abstract: Pure-state deep thermalization predicts that, after sufficient scrambling, projected ensembles approach universal distributions that contain information beyond the reduced density matrix. In…
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Cluster property and entanglement in the superconducting state
arXiv quant-ph
arXiv:2610.30581v1 Announce Type: cross Abstract: We present the conditions for satisfying the cluster property in the superconducting state. Using these conditions, we show that the cluster property employed when deriving the order…
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Quantum theory of molecular orientation
arXiv quant-ph
arXiv:2403.04572v5 Announce Type: replace Abstract: We formulate a quantum phase space for rotational and nuclear-spin states of rigid molecules. For each nuclear spin isomer, we re-derive the isomer's admissible angular momentum states…
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Thermodynamic Uncertainty Relation with Quantum Feedback
arXiv quant-ph
arXiv:2602.22651v2 Announce Type: replace Abstract: Fluctuations are intrinsic to microscopic systems and impose fundamental limits on nonequilibrium precision, as captured by the thermodynamic uncertainty relation (TUR), which links…
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ConQEC: Concolic Testing for Quantum Error-Correcting Code Implementations
arXiv quant-ph
arXiv:2610.31443v1 Announce Type: new Abstract: Quantum error-correcting code (QECC) implementations are hybrid software-control systems: measured syndromes drive decoder dispatch, recovery actions, and logical checks. Existing QECC…
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Exceptional point structure and chiral state transfer in a rate-operator-engineered $\mathcal{PT}$-symmetric Bose-Hubbard dimer
arXiv quant-ph
arXiv:2610.30836v1 Announce Type: new Abstract: The rate operator quantum jumps (ROQJ) is a general method to unravel a master equation describing the dynamics of an open quantum system into stochastic pure state trajectories. By…
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Noise redistribution by stabilizer codes: an organizing view of concatenated three-qubit codes
arXiv quant-ph
arXiv:2610.31007v1 Announce Type: new Abstract: We present an organizing framework for concatenated quantum error correction based on the observation that the syndrome projection of a stabilizer code reshapes the noise channel in a…
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ArcTN: Efficient Tensor-Network Contraction Planning for Quantum Circuit Simulation
arXiv quant-ph
arXiv:2610.31554v1 Announce Type: new Abstract: Tensor-network simulation of quantum circuits depends on contraction orders with low computational cost and small intermediate tensors, found without excessive planning time. We present…
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The exact price of local realism in CHSH experiments: a measurement-dependence-detection trade-off surface, a moir\'e phase-locking mechanism that saturates it, and an unmeasured fringe in the fourfold coincidence sum
arXiv quant-ph
arXiv:2608.18886v5 Announce Type: replace Abstract: For local hidden-variable accounts of the CHSH experiment that are faithful -- reproducing the observed singles and coincidence rates and unbiased marginals of a polarization singlet with…
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Fast Hubbard-Thouless Pumping with Local Counterdiabatic Driving
arXiv quant-ph
arXiv:2610.26786v2 Announce Type: replace Abstract: Counterdiabatic (CD) driving suppresses the excitations of fast protocols by adding an auxiliary Hamiltonian, but in many-body and topological systems the exact CD term is generally…
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Quantum Fokker-Planck solvers as trainable generative models
arXiv quant-ph
arXiv:2610.31330v1 Announce Type: new Abstract: We develop and analyze generative models based on quantum solvers of stochastic differential equations. Unlike the common approach based on layered variational quantum circuits with…
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One-shot entanglement generation and distillation via Petz recovery and binary hypothesis testing
arXiv quant-ph
arXiv:2610.31501v1 Announce Type: new Abstract: How much entanglement can two distant laboratories share when their connection is noisy? We relate this question to deciding which of two quantum hypotheses is present. Our one-shot bounds…
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Spin-resolved microscopy of $^{87}$Sr SU($N$) Fermi-Hubbard systems
arXiv quant-ph
arXiv:2603.05478v3 Announce Type: replace-cross Abstract: Quantum-gas microscopes provide direct access to the phases of the Hubbard model, bringing microscopic insight into the complex competition between interactions, SU(2) magnetism…
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Quantum State Search with Classical Interactive Advice
arXiv quant-ph
arXiv:2610.25657v2 Announce Type: replace Abstract: We study whether a quantum verifier can find a hidden quantum state by exchanging classical messages with an unbounded prover who knows the state. The verifier has access to a reflection…
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Discrete time liquids
arXiv quant-ph
arXiv:2610.30266v1 Announce Type: cross Abstract: Discrete time crystals exhibit robust subharmonic oscillations, spontaneously breaking the discrete time-translation symmetry of a periodic drive. Since their emergence, the question of…
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Fault-Tolerant Logical Operations and Efficient State Preparation in Modular Quantum Architectures with Noisy Interfaces
arXiv quant-ph
arXiv:2607.27204v2 Announce Type: replace Abstract: Modular quantum computing is a leading paradigm for scaling quantum computation beyond the resource limitations of monolithic devices. In this architecture, multiple quantum processing…
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Can Entanglement-Induced Feature-Map Designs Improve Projected Quantum Kernels?
arXiv quant-ph
arXiv:2610.31260v1 Announce Type: new Abstract: Projected quantum kernels (PQKs) have emerged as a notable approach to circumvent the hardness of machine learning tasks arising from the exponential dimensionality of the quantum Hilbert…
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Noise-Robust Quantum-Inspired Synthetic Minority Oversampling for Condition Monitoring and Fault Classification in Industrial and Energy Systems
arXiv quant-ph
arXiv:2601.11423v3 Announce Type: replace Abstract: Class imbalance remains a major challenge in industrial condition monitoring and fault classification, where minority fault patterns can be poorly represented during machine learning…
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Dissipative Time Crystals as Passively Protected Oscillating Qubits
arXiv quant-ph
arXiv:2602.20269v2 Announce Type: replace Abstract: Passive error correction schemes have so far been limited to static memories rather than dynamical qubits. We demonstrate that a driven-dissipative bosonic system, the Bose-Hubbard dimer…
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Entanglement certification of attosecond light fields with photoelectron interferometry
arXiv quant-ph
arXiv:2610.31187v1 Announce Type: new Abstract: The emergence of entangled quantum optical states in high-harmonic generation raises a fundamental problem about its characterization, namely, \textit{how can entanglement of…
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Krylov Complexity and Entropy of Composite Quantum Systems
arXiv quant-ph
arXiv:2610.31394v1 Announce Type: cross Abstract: We investigate the behaviour of Krylov complexity as the number of degrees of freedom of a quantum system increases. Specifically, we show that for tensor products of commuting subsystems…
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Demand-Driven Routing Space for Lattice-Surgery Compilation
arXiv quant-ph
arXiv:2610.30747v1 Announce Type: new Abstract: Lattice-surgery compilation places logical qubits on a grid of surface-code tiles and routes their interactions. Sparse static layouts limit routing contention but reserve space that often…
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Unified Framework for Quantum Resource Recycling via Instrument-Dependent Back-action
arXiv quant-ph
arXiv:2605.03513v2 Announce Type: replace Abstract: Accurate characterization of measurement backaction is crucial for understanding the limits of reusing quantum correlations in sequential scenarios. Here, we develop a unified…
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Hierarchical Reduction of Invariant Subspaces: From Fragmentation to Many-Body Scars
arXiv quant-ph
arXiv:2610.30597v1 Announce Type: cross Abstract: We investigate a hierarchy of invariant Hilbert-space structures connecting Hilbert-space fragmentation, partial solvability, and quantum many-body scars. For spin chains with fragmented…
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Numerical security analysis for practical quantum key distribution
arXiv quant-ph
arXiv:2605.12984v2 Announce Type: replace Abstract: Quantum key distribution (QKD) promises information-theoretic security based on quantum mechanics and idealized device models. Practical implementations, however, deviate from these…
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The limits of magic-state distillation
arXiv quant-ph
arXiv:2610.31115v1 Announce Type: new Abstract: Magic-state factories are a major cost of fault-tolerant quantum computing, yet how few noisy inputs they need is known only for restricted protocols. We show that, for tolerating input…
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Exact and Asymptotically Complete Robust Verifications of Neural Networks via Ising Solvers
arXiv quant-ph
arXiv:2603.00408v5 Announce Type: replace-cross Abstract: We present an Ising-compatible framework for formal neural-network robustness verification under bounded input perturbations. For piecewise activations (both continuous…
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Critical timescales for chiral state conversion and irreversibility
arXiv quant-ph
arXiv:2604.01918v3 Announce Type: replace Abstract: Non-Hermitian systems driven along slow parametric loops undergo non-adiabatic transitions whose outcome depends sensitively on the driving speed, yet no explicit formula has been…
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Bounding Classical and Quantum Correlations in Bayesian Networks with Quasiprobabilities
arXiv quant-ph
arXiv:2606.23372v2 Announce Type: replace Abstract: Bell's theorem reveals that quantum theory is in tension with classical causal reasoning and, in particular, the notion of local causality. This is now understood as a particular example…
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Faster matrix product state preparation by exploiting symmetry-induced block-sparsity
arXiv quant-ph
arXiv:2605.28489v2 Announce Type: replace Abstract: Matrix product states (MPS) serve as a key tool for studying quantum systems from chemistry and condensed-matter physics, making their preparation on quantum computers an important task…
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All-photonic millimeter-wave and terahertz signal core at room and cryogenic temperatures
arXiv quant-ph
arXiv:2610.30857v1 Announce Type: cross Abstract: Millimeter-wave and terahertz technologies offer new opportunities for high-capacity communications, sensing, and quantum systems, but electronic signal chains above 100 GHz are limited by…
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Memory--Transport Competition in Physical Two-Bath Quantum Reset Dynamics
arXiv quant-ph
arXiv:2610.30457v1 Announce Type: new Abstract: Coherence preservation and environmental renewal offer competing ways of controlling quantum memory and transport. We show that a seemingly natural protocol which exactly replaces the bath…
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Distillation of supersinglet states
arXiv quant-ph
arXiv:2509.20962v3 Announce Type: replace Abstract: We introduce an entanglement distillation (purification) protocol for supersinglet states composed of N qubits. The supersinglet state we target is a total spin zero state with zero spin…
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Coherence and imaginarity of qubit states under vanishing Bargmann invariants
arXiv quant-ph
arXiv:2610.30618v1 Announce Type: new Abstract: Set coherence and set imaginarity are two important quantum resources defined by sets of states. We investigate tuples of qubit states under vanishing higher-order Bargmann invariants and…
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Normal-Form Characterization of Adaptivity and Entanglement in Pauli-Based Computation
arXiv quant-ph
arXiv:2610.30315v1 Announce Type: new Abstract: Pauli-based computation (PBC) is a measurement-based model of quantum computation that samples from output distributions of universal Clifford+$T$ circuits. Here, we provide a normal form…
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Operator quantum singular value transformation: Spectral mapping, design and topological invariants
arXiv quant-ph
arXiv:2401.09007v2 Announce Type: replace Abstract: Quantum singular value transformation (QSVT) provides a unifying framework for quantum algorithms by applying the polynomials of quantum signal processing (QSP) to block-encoded matrices…
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Meta-learning of Gibbs states for many-body Hamiltonians with applications to Quantum Boltzmann Machines
arXiv quant-ph
arXiv:2507.16373v3 Announce Type: replace Abstract: The preparation of quantum Gibbs states is a fundamental challenge in quantum computing, essential for applications ranging from modeling open quantum systems to quantum machine learning…
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Photon localization: Local measurements, localized states, and causality
arXiv quant-ph
arXiv:2610.30473v1 Announce Type: new Abstract: We review what it means for a relativistic particle to be localized and argue that the most useful approach is through local measurement. This perspective ties localization directly to…
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A sharp gradient-corrected Lieb--Thirring inequality in one dimension with applications to density functional theory
arXiv quant-ph
arXiv:2610.30887v1 Announce Type: cross Abstract: We first prove a sharp Lieb-Thirring inequality with semi-classical constant and gradient correction in one dimension. In the periodic setting, the corresponding inequality also includes a…
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Local Dephasing Sustains Continuous Time Crystals in a Spin-1/2 Ensemble
arXiv quant-ph
arXiv:2610.31230v1 Announce Type: new Abstract: Local pure dephasing suppresses single-spin coherence, yet we show that it sustains continuous time-crystalline order in a fully connected ferromagnetic spin-$1/2$ ensemble with local decay…
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Symmetry-Preserving and Scalable Variational Circuits for the Lattice Gross-Neveu Model
arXiv quant-ph
arXiv:2610.30270v1 Announce Type: cross Abstract: We study variational preparation of ground states and sector-resolved excited states in the $(1+1)$-dimensional lattice Gross-Neveu model. We construct fixed circuits preserving either…
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Finite-width altermagnetic quantum rings: angular-channel hybridization and Aharonov--Bohm physics
arXiv quant-ph
arXiv:2610.30536v1 Announce Type: cross Abstract: We study a finite-width two-dimensional quantum ring with a quadratic $d$-wave altermagnetic term, Tan--Inkson confinement, a perpendicular magnetic field, and independently tunable…
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NVIDIA Takes Strategic Stake in Riverlane to Accelerate Real-Time Quantum Error Correction and GPU Decoder Calibration
Quantum Computing Report
NVIDIA has invested in Riverlane to advance real-time quantum error correction (QEC) and GPU decoder calibration. This collaboration utilizes NVIDIA H100 GPUs to accelerate Riverlane's Local Clustering Decoder (LCD), significantly reducing…
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IQM and NVIDIA Automate 20-Qubit Chip Calibration via NVIDIA Ising Vision-Language Models and QCalEval Benchmark
Quantum Computing Report
IQM Quantum Computers and NVIDIA have successfully automated the calibration of a 20-qubit quantum processor using NVIDIA Ising Vision-Language Models (VLMs). This agentic AI system analyzes experimental data, autonomously adjusts…
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IBM Releases Qiskit SDK v2.6 with C API Pass-Manager Framework, Native QPY Serialization, and Custom Operations
Quantum Computing Report
IBM Quantum has released Qiskit SDK v2.6, significantly enhancing its C API layer with a new pass-manager framework and native QPY serialization. This update allows for custom compiler passes and hardware-native quantum operations in C…
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Chalmers University Demonstrates TRIO Pulses for Control-Error-Robust Single-Qubit Gates in Superconducting Processors
Quantum Computing Report
Chalmers University of Technology has developed TRIO pulses, a new quantum control framework for superconducting processors. These pulses enable single-qubit gates to maintain high fidelity even with significant control-amplitude…