Quantum Computing
Quantum Computing news — Monday 28 September 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
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Podcast with Steve Gibson, President of Americas at JIJ
Quantum Computing Report
Yuval Boger's guest is Steve Gibson, President of Americas at JIJ, a Japan-based optimization company whose founders came from Professor Nishimori’s lab. Steve shared how JIJ spans the spectrum from classical to quantum-inspired to quantum…
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Donate ＆ Join Us! Trick, Treat, and Quantum Physics: Kai Brings Halloween to ETH Zürich
The Quantum Insider
Insider Brief The Quantum Kid brings quantum physics to wow² Space at ETH Zürich on October 31 — Halloween! — with 10-year-old Kai dressed as the Grim Reaper. Families and quantum-curious kids in the Zurich area are invited to come along…
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FSU Receives $2.1 Million for Quantum Communication Testbed
The Quantum Insider
Insider Brief Florida State University will establish a campus-scale quantum communication testbed with $2.1 million in federal Community Project Funding through NIST. The testbed will connect a central quantum communication hub with nodes…
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Quobly and CEA-Leti Strengthen Collaboration via FAMES Pilot Line to Scale 300 mm Silicon Spin-Qubit Platform
Quantum Computing Report
Quobly and CEA-Leti are strengthening their collaboration through the FAMES Pilot Line, providing Quobly access to advanced processing tools for prototyping 3D integration and RF control layers for next-generation quantum processing units…
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India’s Finance Minister Places Quantum Among Next Major Infrastructure Investment Priorities
The Quantum Insider
Insider Brief India’s next major infrastructure investments will include quantum technology, AI and semiconductor chips, Finance Minister Nirmala Sitharaman said, according to the Hindustan Times. Sitharaman called for academia and…
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Occam Foundry Gains Austin and UT Austin Support for Quantum Campus
The Quantum Insider
Insider Brief Occam Foundry has received a letter of support from Austin Mayor Kirk Watson and signed an MOU with UT Austin’s Texas Advanced Computing Center (TACC) for its planned quantum technology campus. The partnership will explore…
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KIST Connects Korean Quantum Startups With U.S. Partners at QWC 2026
The Quantum Insider
Insider Brief KIST led four South Korean quantum startups at Quantum World Congress 2026, facilitating discussions with U.S. companies, research institutions and investors. The delegation explored potential collaborations with D-Wave …
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CEA-Leti and Quobly Strengthen Their Collaboration to Accelerate the Development of Next-Generation Silicon Quantum Technologies
The Quantum Insider
Insider Brief Quobly is expanding its collaboration with CEA-Leti through access to the FAMES Pilot Line to develop technologies for future silicon quantum processors. FAMES provides semiconductor equipment to test manufacturing processes…
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Pasqal Shifts French Public Collaboration Toward Commercial Quantum Computing
The Quantum Insider
Insider Brief Pasqal is shifting its collaboration with French public authorities toward commercial applications and away from its participation in the LSQUARE/PROQCIMA defense program. The company completed the technological objectives of…
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UCL and Siloton Adapt Quantum-Enabled Eye Imaging for Children
The Quantum Insider
Insider Brief UCL researchers are partnering with Bristol-based Siloton to adapt its quantum-enabled OCT eye-imaging system for use by children with potentially sight-threatening conditions. The NIHR-funded project will modify Siloton’s…
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Quandela Seeks South Korean Partners for Photonic Quantum Computing
The Quantum Insider
Insider Brief Quandela plans to spend the next two years developing strategic partnerships in South Korea covering quantum manufacturing, system integration and operations. The company wants to work with Korean partners on photonic module…
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Researchers Identify Limits on Quantum Battery Energy And Power Stability
The Quantum Insider
Insider Brief Researchers identified fundamental limits on quantum-battery reliability, showing how charging strategies can balance high power with more stable energy delivery. The theoretical study found that quantum uncertainty prevents…
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When Can Quantum Extreme Learning Machines Replace Quantum Reservoirs?
arXiv quant-ph
arXiv:2609.31027v1 Announce Type: new Abstract: Quantum reservoir computers (QRCs) retain information from earlier inputs, whereas reset-window quantum extreme learning machines (QELMs) start afresh and receive only a recent input window…
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Single-shot coherent process tomography and mid-infrared polarimetry with undetected photons
arXiv quant-ph
arXiv:2609.31043v1 Announce Type: new Abstract: Measurements with undetected photons infer properties of a probe beam that is never detected, transferring mid-infrared information onto silicon-friendly wavelengths. Tomography in this…
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Modeling quantum neural network gradient with reinforcement learning
arXiv quant-ph
arXiv:2609.31066v1 Announce Type: new Abstract: Training quantum neural networks (QNNs) on near-term hardware remains hampered by two compounding difficulties: the exponential vanishing of gradient variance known as the barren plateau, and…
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Distinct Feedback-Strength Requirements for Quantum-State Ensemble Preparation under Channel-Equivalent Monitoring
arXiv quant-ph
arXiv:2609.31221v1 Announce Type: new Abstract: Different measurements of the same environment can preserve the average quantum channel yet change the feedback strength needed to prepare a state ensemble. We establish this distinction for…
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Excitation exchange between identical atoms having arbitrary angular momentum
arXiv quant-ph
arXiv:2609.31316v1 Announce Type: new Abstract: Equations of motion are derived for excitation exchange between two atoms having arbitrary angular momentum.
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Quantum-HPC Workflows Across Multiple Quantum Computing Platforms: Two Case Studies
arXiv quant-ph
arXiv:2609.31528v1 Announce Type: new Abstract: We describe the Quantum-HPC hybrid system comprising the supercomputer Fugaku, the QPUs Quantinuum Reimei and ibm_kobe, and the Tierkreis hybrid workflow software. We present two…
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Active-Space Quantum Simulation of N$_2$ Hydrogenation at a Ru Single-Atom Site on Ru(0001)
arXiv quant-ph
arXiv:2609.30958v1 Announce Type: cross Abstract: Selective activation of dinitrogen (N$_2$) under mild conditions is difficult: N$\equiv$N is one of the strongest bonds in chemistry, and most heterogeneous catalysts capable of breaking it…
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Measurement protocol for non-adiabatic geometric phases of Floquet states
arXiv quant-ph
arXiv:2609.31052v1 Announce Type: cross Abstract: Periodically time-dependent quantum systems have Floquet solutions. They consist of a phase factor and a Floquet mode which shares the periodicity of the driving. Consequently, any such…
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Feedback cooling of a levitated nanoparticle in a radially polarized vector beam trap
arXiv quant-ph
arXiv:2609.31068v1 Announce Type: cross Abstract: We demonstrate optical levitation and feedback cooling of a silica nanoparticle (radius = 78~nm) trapped within a radial vector beam (RVB) in high vacuum. Radial vector beams, when focused…
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Single-Spin Nitrogen-Vacancy Hybrid Magnetometer with Enhanced Static Field Sensitivity
arXiv quant-ph
arXiv:2510.03462v2 Announce Type: replace Abstract: Precision sensing and imaging of weak static magnetic fields are crucial for a variety of emerging nanoscale applications. While nitrogen-vacancy (NV) centers in diamond provide…
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The marginal is pretty good
arXiv quant-ph
arXiv:2609.05225v2 Announce Type: replace Abstract: One-shot information theory measures often require an optimization over states, but the form of these optimizers can be complicated or depend on the initial problem in nonlinear ways. In…
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Compiling the 2D Fermi-Hubbard ground-state energy estimation algorithm for active volume quantum architectures
arXiv quant-ph
arXiv:2609.05316v2 Announce Type: replace Abstract: As quantum computing enters the early fault-tolerant era, circuit compilation choices will increasingly depend on details of the underlying architecture rather than solely optimizing for…
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Refuting the QAOA fixed-angle conjecture
arXiv quant-ph
arXiv:2609.27703v2 Announce Type: replace Abstract: The fixed-angle conjecture for the quantum approximate optimisation algorithm (QAOA) is shown to be false for depth-2 QAOA on 9-regular graphs, and proven to be correct for depth-1 on any…
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QASM-Eval: A Dataset to Train and Evaluate LLMs on OpenQASM-3 Beyond Quantum Circuits
arXiv quant-ph
arXiv:2605.30358v2 Announce Type: replace-cross Abstract: Quantum computing remains in the Noisy Intermediate-Scale Quantum (NISQ) era, with performance constrained by noise. Addressing this limitation requires hardware-facing capabilities…
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Duality between the level statistics of Hermitian and non-Hermitian random matrices
arXiv quant-ph
arXiv:2609.00162v2 Announce Type: replace-cross Abstract: The complex spectral statistics of non-Hermitian random matrices provide a standard diagnostic of dissipative quantum chaos. Yet an analytical understanding of how symmetry enriches…
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Exact joint eigenvalue densities of non-Hermitian random matrices are Calogero scattering states
arXiv quant-ph
arXiv:2609.00164v2 Announce Type: replace-cross Abstract: Determining exact joint eigenvalue densities is central to random matrix theory. We solve this long-standing problem for non-Hermitian matrices with transposition symmetry (complex…
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Generation of Photonic Graph States with minimal number of quantum emitters
arXiv quant-ph
arXiv:2609.30400v1 Announce Type: new Abstract: Graph states are a fundamental resource for measurement and fusion-based quantum computing, quantum networks, and sensing. Preparing them in a photonic system deterministically is, in…
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Exact series formulas for the capacities of the amplitude damping channel
arXiv quant-ph
arXiv:2609.31609v1 Announce Type: new Abstract: We derive explicit, absolutely convergent series formulas for the quantum, unassisted classical, and entanglement-assisted classical capacities of the qubit amplitude damping channel…
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Quantum-circuit simulation of three-flavor neutrino oscillations: vacuum, matter, and CP diagnostics
arXiv quant-ph
arXiv:2609.30875v1 Announce Type: new Abstract: We simulate three-flavor neutrino oscillations on two-qubit quantum circuits. The flavor space is embedded as $\ket{00}=\nu_e$, $\ket{01}=\nu_\mu$, $\ket{10}=\nu_\tau$ with the $\ket{11}$…
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Preparation Changes the Cost of Calibration for Quantum Control
arXiv quant-ph
arXiv:2609.30910v1 Announce Type: new Abstract: Error-correction records can reveal noise yet supply the information needed for control too slowly. In a surface code under Gaussian dephasing, encoded calibration learns a correlation that…
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Quantum Approximate Optimisation Algorithm for Protein Sidechain Packing
arXiv quant-ph
arXiv:2609.31077v1 Announce Type: new Abstract: Sidechain packing is a critical stage in protein folding, with direct implications for structure-based drug discovery. Google DeepMind's tool, AlphaFold2, predicts protein backbone reliably…
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Nonstabilizerness of quantum tensor network states is intractable in two dimensions
arXiv quant-ph
arXiv:2609.31459v1 Announce Type: new Abstract: Nonstabilizerness is a necessary resource for quantum systems to lie beyond the classically simulable regime. With the advent of stabilizer $\alpha$-R\'enyi entropies, nonstabilizerness has…
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Polarization, Maximal Concurrence, and Pure States in High-Energy Collisions
arXiv quant-ph
arXiv:2604.17756v4 Announce Type: replace-cross Abstract: We establish a quantitative relation between local spin polarization and quantum entanglement in two-qubit systems by mathematically proving a closed-form upper bound on the…
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Quantum algorithms for the exponentiation of Toeplitz matrices and applications in partial differential equations
arXiv quant-ph
arXiv:2609.31372v1 Announce Type: new Abstract: We present quantum algorithms to approximate the exponential of banded Toeplitz matrices. These matrices have central importance in many PDE related problems, but their quantum implementation…
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Colored Weingarten Calculus for Block-Unitary Ensemble
arXiv quant-ph
arXiv:2609.30385v1 Announce Type: new Abstract: Haar randomness is the standard null model for quantum typicality, scrambling, and random-matrix formulations of thermalization. In many physical settings, however, randomness is naturally…
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Entanglement transitions in holographic conformal interfaces
arXiv quant-ph
arXiv:2609.30369v1 Announce Type: cross Abstract: We study entanglement transitions for pairs of disjoint intervals in two-dimensional holographic interface conformal field theories. We consider several holographic models with equal…
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Nearly optimal algorithms to learn sparse quantum Hamiltonians in physically motivated distances
arXiv quant-ph
arXiv:2509.09813v2 Announce Type: replace Abstract: We study the problem of learning Hamiltonians $H$ that are $s$-sparse in the Pauli basis, given access to their time evolution. Although Hamiltonian learning has been extensively…
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Geometric quantum discord in the black hole quantum atmosphere
arXiv quant-ph
arXiv:2607.16641v2 Announce Type: replace Abstract: We investigate the geometric quantum discord of bipartite Werner states influenced by Hawking radiation in the quantum atmosphere of a Schwarzschild black hole. We find that the geometric…
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Coherent advantage in the computational expressivity of excitonic networks
arXiv quant-ph
arXiv:2609.10448v2 Announce Type: replace Abstract: The rising energy consumption of AI has generated interest in physical systems as alternative substrates for trainable computation. Recent experimental advances have enabled precise…
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Exponential Quantum Advantage in Testing Fourier Dimensionality
arXiv quant-ph
arXiv:2609.25816v2 Announce Type: replace Abstract: A boolean function $f$ has Fourier dimension $k$ if its nonzero Fourier coefficients span a subspace of dimension $k$. We consider the property testing task of determining whether a…
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Oracle Distillation
arXiv quant-ph
arXiv:2609.31596v1 Announce Type: new Abstract: Learning and sensing are among the most promising applications of quantum technology, often with provable quantum advantages. In any realistic experiment, however, noise threatens to erase…
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Vertex-transitive quantum graphs
arXiv quant-ph
arXiv:2605.30730v3 Announce Type: replace-cross Abstract: We define a quantum graph to be vertex-transitive if the join of its automorphism group is the maximum quantum relation on its quantum vertex set, in direct analogy with the…
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Exact Characterization of the Holevo Bound by a Quantum Fisher Information Family
arXiv quant-ph
arXiv:2609.31601v1 Announce Type: new Abstract: The quantum Cram\'er-Rao bound constrains the precision of parameter estimation through the symmetric logarithmic derivative quantum Fisher information (SLD QFI). It is asymptotically…
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Generators of stability-preserving semigroups, spectral gaps, and classical ground-state computation
arXiv quant-ph
arXiv:2609.26802v2 Announce Type: cross Abstract: We classify the generators of stability-preserving semigroups on polynomial spaces with bounded coordinate degrees. The generators have differential order at most two, with principal…
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Attosecond topological interference beyond Floquet-Volkov paths
arXiv quant-ph
arXiv:2609.30282v1 Announce Type: new Abstract: Combining attosecond science with semiconductor physics provides a promising interdisciplinary platform for the attosecond control of semiconducting properties. In each field, the…
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Quantum advantage in learning single mode bosonic channels
arXiv quant-ph
arXiv:2609.30374v1 Announce Type: new Abstract: Quantum resources can dramatically reduce the data required to learn physical systems, with exponential improvements in sample complexity demonstrated in several quantum learning tasks…
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Exact Solutions of the Dunkl--Pauli Equation in the Presence of a Magnetic Field from an su(1,1) Algebraic Approach
arXiv quant-ph
arXiv:2609.31554v1 Announce Type: new Abstract: We investigate the two-dimensional Dunkl--Pauli equation for a spin--$1/2$ particle in the presence of an external magnetic field within an algebraic framework. While previous studies have…
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Von Neumann's Two Quantum Entropies
arXiv quant-ph
arXiv:2609.30284v1 Announce Type: cross Abstract: Von Neumann proposed two quantum entropies, one in 1927 and the other in 1929. He intended to define thermodynamic entropy for quantum states in both cases. The 1927 entropy is the…
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Regularization of Riemannian optimization: Application to process tomography and quantum machine learning
arXiv quant-ph
arXiv:2404.19659v2 Announce Type: replace Abstract: Gradient descent algorithms on Riemannian manifolds have recently been proposed as a practical tool for optimizing quantum channels. We add rank-penalizing regularization terms to the…
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An end-to-end quantum algorithm for nonlinear fluid dynamics with bounded quantum advantage
arXiv quant-ph
arXiv:2512.03758v2 Announce Type: replace Abstract: Computational fluid dynamics (CFD) is a cornerstone of classical scientific computing, and there is growing interest in whether quantum computers can accelerate such simulations. The…
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Amplification of bosonic interactions through squeezing in the presence of decoherence
arXiv quant-ph
arXiv:2602.16655v2 Announce Type: replace Abstract: We consider the amplification of bosonic interactions through parametric control that implements squeezing along orthogonal quadratures. We show that bosonic interactions described by…
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Unlocking photodetection for quantum sensing with Bayesian likelihood-free methods and deep learning
arXiv quant-ph
arXiv:2602.19792v2 Announce Type: replace Abstract: To operate quantum sensors at their quantum limit in real time, it is crucial to identify efficient data inference tools for rapid parameter estimation. In photodetection, the key…
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Identifying the Sign of Coherent Over-Rotations with Logarithmically Many Pauli Settings
arXiv quant-ph
arXiv:2607.21663v2 Announce Type: replace Abstract: Calibrating a quantum processor means estimating gate-error parameters from data, and a hard-to-estimate parameter is usually assumed to leave a weak signature more repetitions will…
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Captured weight and boundary leakage bound the error of sample-based spectral functions
arXiv quant-ph
arXiv:2608.16436v3 Announce Type: replace Abstract: Sample-based quantum diagonalization builds a subspace from a device's measured bitstrings. From one protocol -- computational-basis samples of a real-time evolved probe, no Hadamard test…
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Provable Quantum-Classical Separation for Continuous Gibbs Sampling
arXiv quant-ph
arXiv:2608.24527v2 Announce Type: replace Abstract: We prove the first quantum-classical separation for a sampling problem over a continuous domain. For a class of Gibbs states $p\propto e^{-\beta E}$ on the torus $\mathbb{T}^d$ with…
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Symmetry-resolved Krylov Complexity and the Uncoloured Tensor Model
arXiv quant-ph
arXiv:2604.05630v2 Announce Type: replace-cross Abstract: The symmetry-resolved Krylov complexity is a useful tool for studying the chaotic properties of systems endowed with symmetries. We investigate the conditions under which an…
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Quantum Thermodynamics of Electron Transport along Chains of Redox Centers
arXiv quant-ph
arXiv:2607.09728v2 Announce Type: replace-cross Abstract: Intramolecular electron transport in biological systems is typically described as a diffusive hopping process, according to the semi-classical rate theories of Marcus and Hopfield…
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Ramp, Plateau, and Wormholes without Averaging, and Hyper-non-perturbative Structures in Gravity
arXiv quant-ph
arXiv:2608.02743v2 Announce Type: replace-cross Abstract: Universal hallmarks of quantum chaos---such as the ramp and plateau in the spectral form factor---and the ramp's gravitational duals involving wormholes are widely interpreted as…
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Design of a Lamb-Shift Polarimeter for $^3$He Ions and Atoms
arXiv quant-ph
arXiv:2609.22186v2 Announce Type: replace-cross Abstract: In high energy physics experiments $^3$He$^{2+}$ nucleons are suitable to test the internal structure of neutrons, which makes them the perfect substitute. Moreover, it is one of…
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A Novel $q$-Derivative Framework with Applications to $q$-Deformed Thermodynamics and Leakage Suppression in Superconducting Qubits
arXiv quant-ph
arXiv:2609.30632v1 Announce Type: new Abstract: We propose a new $q$-derivative operator built directly from Jackson's $q$-number formulation, designed to preserve the structural properties of standard differential calculus while…
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Residual Fisher Information in Measurement-Error Uncertainty
arXiv quant-ph
arXiv:2609.31311v1 Announce Type: new Abstract: Measurement error in the Watanabe-Sagawa-Ueda formulation is the excess estimation error of a classical record over the quantum statistical limit. We show that, at the quantum-instrument…
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Connes Distance in Discrete-Time Quantum Walks
arXiv quant-ph
arXiv:2609.31488v1 Announce Type: new Abstract: We study the geometric spread of discrete-time quantum walks using Connes' distance formula. We introduce its discrete analogue by adapting the continuous spectral metric to the lattice, with…
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Quantum Memory and Autonomous Computation in Two Dimensions
arXiv quant-ph
arXiv:2601.20818v3 Announce Type: replace Abstract: Quantum error correction (QEC) normally requires active maintenance using measurements, classical processing and externally controlled correction schedules. Passive QEC, by contrast, was…
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Quantum memory precludes mixed-unitary dynamics
arXiv quant-ph
arXiv:2603.17010v2 Announce Type: replace Abstract: Unital quantum channels, defined by their property of leaving the maximally mixed state invariant, form an important class of quantum operations. A distinguished subset of these channels…
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Reducibility of native weighted graphs on Rydberg Arrays
arXiv quant-ph
arXiv:2605.07952v2 Announce Type: replace Abstract: We investigate the classical reducibility of random unit-disk graph (UDG) instances of the maximum independent set (MIS) and maximum weighted independent set (MWIS) problems, which can be…
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Breaking the Curse of Dimensionality in Quantum PDE Solvers via Gevrey Regularity
arXiv quant-ph
arXiv:2608.07893v3 Announce Type: replace Abstract: We connect different degrees of smoothness of real-valued periodic functions to the number of qubits required for their high-precision Fourier-basis amplitude encodings. Our central…
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Engineering multi-photon dissipation with a dc-voltage-biased Josephson junction
arXiv quant-ph
arXiv:2608.31154v2 Announce Type: replace Abstract: Multi-photon dissipation -- a key resource for bosonic qubits -- is usually realized by parametrically pumping a Josephson coupler at the cost of spurious nonlinear terms. Here we instead…
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Adaptive detection of Rabi signals under composite hypotheses
arXiv quant-ph
arXiv:2609.16119v2 Announce Type: replace Abstract: Motivated by searches for weak coherent drives, we formulate repeated quantum sensing with a fixed shot budget as an asymmetric composite hypothesis test. Taking Rabi sensing as a…
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Query-optimal quantum simulation of Lindblad evolution
arXiv quant-ph
arXiv:2609.17490v2 Announce Type: replace Abstract: For the problem of simulating Lindblad evolution for time $t$ to precision $\epsilon$, Hamiltonian simulation provides an additive query lower bound, informally, $\Omega(t +…
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Post-Selection-Based Stochastic Quantum Battery
arXiv quant-ph
arXiv:2609.25699v2 Announce Type: replace Abstract: Quantum batteries are quantum systems that store useful energy, which can be subsequently extracted to perform work. In this paper, we investigate the charging dynamics of the quantum…
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Criticality enabled long-range order in a U(1)-symmetric spin-1 Heisenberg chain with biquadratic interactions
arXiv quant-ph
arXiv:2609.31319v1 Announce Type: cross Abstract: In a recent paper Nahum argued on the basis of a renormalization-group analysis that, contrary to standard lore, ground states of 1D spin chains with short-range interactions can…
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Parallel and Distributed Fermionic Simulation via Dynamic Encoding
arXiv quant-ph
arXiv:2609.31502v1 Announce Type: new Abstract: We demonstrate a simple and efficient method to parallelize and distribute Trotterized Hamiltonian simulation of fermionic systems across multiple QPUs. Using combinatorial covering designs…
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Computational aberration-retrieval with entangled photons
arXiv quant-ph
arXiv:2609.31049v1 Announce Type: new Abstract: Adaptive optics (AO) is central to high-resolution microscopy, yet conventional implementations often require repeated correction-and-measurement cycles whose number increases with aberration…
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R\'enyi Phase Transitions and Analytic Continuation to the von Neumann Entropy
arXiv quant-ph
arXiv:2609.30386v1 Announce Type: new Abstract: Extracting operationally meaningful quantities such as von Neumann entropy and mutual information is central to characterizing many-body quantum systems, yet experiments and numerics often…
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A Generalized Stein Lemma for Quantum Channels
arXiv quant-ph
arXiv:2609.30762v1 Announce Type: new Abstract: We prove a generalized quantum Stein lemma for parallel discrimination of an arbitrary finite-dimensional channel against families of alternative channels. The alternatives are compact and…
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Classification of Generalised Triorthogonal Codes through Length 54
arXiv quant-ph
arXiv:2609.30860v1 Announce Type: new Abstract: Magic state distillation is a widely considered primitive in fault-tolerant quantum computation for the preparation of high-fidelity non-Clifford resources. The most commonly considered class…
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Bypassing no-go theorems on mixed classical-quantum systems: the (counter)example of hybrid van Hove theory
arXiv quant-ph
arXiv:2609.31209v1 Announce Type: new Abstract: Motivated by models of mixed quantum-classical hybrid theories, we consider the representation of classical observables as Hilbert-space operators based on van Hove's unitary representation…
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Adaptive Dissipative State Preparation through Reinforcement Learning
arXiv quant-ph
arXiv:2609.31370v1 Announce Type: new Abstract: Dissipative algorithms approach the problem of ground state preparation by mimicking the natural thermalization of a quantum system in contact with a large, low-temperature thermal…
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Onset of random-matrix statistics in the Yukawa-Sachdev-Ye-Kitaev model: Spectral correlations and Krylov complexity
arXiv quant-ph
arXiv:2609.30333v1 Announce Type: cross Abstract: The Yukawa-Sachdev-Ye-Kitaev (YSYK) model, a solvable model of non-Fermi liquids with a proposed cavity-QED realization, couples $N$ complex fermions to $M$ bosons of frequency $\omega_0$…
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On the applicability of Kolmogorov's theory of probability to the description of quantum phenomena. Part II: Bell inequalities
arXiv quant-ph
arXiv:2609.31075v1 Announce Type: new Abstract: Among the various "no-go theorems" in the foundations of quantum mechanics, Bell inequalities are among the few, which do not implicitly rely on the mathematical structure of quantum…
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Supporting functionals and singular boundary geometry of two-qubit entanglement of formation
arXiv quant-ph
arXiv:2609.31097v1 Announce Type: new Abstract: We give a criterion for the existence of a global supporting affine functional for the entanglement of formation at an entangled two-qubit state. It exists if and only if the spin-flip…
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Optical characterization of excited-state spin Hamiltonians and clock transitions at telecommunication wavelength in Tm3+:YAlO3
arXiv quant-ph
arXiv:2609.31194v1 Announce Type: new Abstract: The zero-phonon line (ZPL) between the two excited-state manifolds 3F4 and 3H4 of the trivalent thulium ion in yttrium aluminum perovskite (Tm3+:YAlO3) lies within the telecom E-band at…
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Steady--State Current Signatures of Strong Light--Matter Coupling in Single--Molecule Junctions
arXiv quant-ph
arXiv:2609.31265v1 Announce Type: new Abstract: Strong light-matter coupling offers exciting opportunities for controlling molecular properties, yet resolving single-molecule behavior from collective effects remains a challenge. Recent…
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Confinement, String Breaking, and Hadronization in the Compact Abelian Higgs Model
arXiv quant-ph
arXiv:2607.27550v2 Announce Type: replace-cross Abstract: While real-time simulation of Quantum Chromodynamics remains technologically out of reach, many simplified models for studying elements of QCD phenomenology are being investigated…
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Sipser-Spielman meets Dijkgraaf-Witten: non-Abelian qLDPC codes via twisted sheaf gauge theory and almost-constant-overhead magic state fountain
arXiv quant-ph
arXiv:2609.31541v1 Announce Type: new Abstract: Sipser-Spielman codes and Dijkgraaf-Witten twisted gauge theories are among the most profound ideas in the last few decades in the areas of computer science and mathematical physics…
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Chiral Transfer and Entanglement Generation of Even-Parity Bell States with Engineered Two-Photon Loss
arXiv quant-ph
arXiv:2609.31239v1 Announce Type: new Abstract: We investigate chiral transfer and dissipative generation of even-parity Bell states in a two-qubit system with coherent two-photon driving and engineered two-photon loss. We find that…
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Quantum environment afterglow from broadband excitation spectroscopy in superconducting qubits
arXiv quant-ph
arXiv:2609.31280v1 Announce Type: new Abstract: Understanding the qubit environment is central to fault-tolerant superconducting quantum computation. Characterization typically relies on relaxation, leaving excitation largely…
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Gottesman-Kitaev-Preskill error-correction with decohered resources
arXiv quant-ph
arXiv:2609.31462v1 Announce Type: new Abstract: Teleportation-based Gottesman-Kitaev-Preskill (GKP) error correction typically assumes a decoherence-free GKP ancilla Bell pair, an idealization that is difficult to reconcile with the…
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Seasonal and Quantum-inspired Models for Neutron Monitor Time Series Forecasting
arXiv quant-ph
arXiv:2609.30281v1 Announce Type: cross Abstract: We present a focused and reproducible study of multi-horizon forecasting on the Lomnicky Stit neutron monitor (LMKS) time series. Our evaluation suite covers simple seasonal baselines…
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High-gain vortex transfer via activated forbidden transitions in molecular magnets
arXiv quant-ph
arXiv:2609.31134v1 Announce Type: cross Abstract: Vortex light has garnered considerable interest in recent years owing to its distinctive properties and broad application potential. In this paper, we employ a conventional three-level…
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Fermionic many-body topology in cavity-coupled Su-Schrieffer-Heeger chains
arXiv quant-ph
arXiv:2604.13936v2 Announce Type: replace-cross Abstract: We study the effects of cavity-mediated interactions on the symmetries and topological properties of a Su-Schrieffer-Heeger chain coupled to a single mode photonic cavity…
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Phase-accumulating hyperfine strain sensing with rare-earth-ion phase memories
arXiv quant-ph
arXiv:2609.31151v1 Announce Type: new Abstract: Long-lived hyperfine coherences in rare-earth-ion crystals provide controlled phase evolution windows for metrology. We use this resource to propose an experimental protocol for accessing…
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Quantum Diffusion Models for Medical Image Analysis
arXiv quant-ph
arXiv:2609.31070v1 Announce Type: cross Abstract: Quantum Machine Learning is a novel field of research aimed at devising machine learning approaches exploiting principles of quantum mechanics, such as superposition, entanglement and…
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Highly elastic collisions of ultracold asymmetric top molecules in a static electric field
arXiv quant-ph
arXiv:2609.31317v1 Announce Type: cross Abstract: We propose that the application of static electric fields to reactive CaNH$_2$ molecules can result in large ratios of elastic to lossy collisions at ultracold temperatures. In the first…
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Efficient Quantum Simulations of Yang-Mills theory with Maximal-tree Gauge
arXiv quant-ph
arXiv:2608.27267v2 Announce Type: replace-cross Abstract: We develop a quantum algorithmic framework for the efficient simulation of Yang--Mills theories, including the $\mathrm{SU}(3)$ gauge theory in Quantum Chromodynamics (QCD). The…
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From Received Power to Certified Secret Keys: A General Method for Bridging Classical FSO Link Budgets and Decoy-State QKD
arXiv quant-ph
arXiv:2609.30874v1 Announce Type: new Abstract: Received optical power determines photon arrival flux, but photon arrival flux does not certify a quantum key. This paper gives a deployment-independent interface from a classical free-space…
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Electron beam driven collective self hybridized exciton polaritons
arXiv quant-ph
arXiv:2609.07164v2 Announce Type: replace Abstract: Self-hybridized exciton polaritons in layered semiconductors emerge from the hybridization of excitonic resonances with confined photonic modes in films and provide a versatile platform…
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Collective-State Preparation in a Subwavelength Triangular Trimer Using SUPER Excitation
arXiv quant-ph
arXiv:2607.12665v2 Announce Type: replace-cross Abstract: The Swing-UP of quantum EmitteR population (SUPER) scheme has recently been proposed as a deterministic method for the preparation of collective radiative states in two strongly…
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Optimal noisy sequential multiparameter quantum sensing
arXiv quant-ph
arXiv:2609.30398v1 Announce Type: new Abstract: The most general strategy for estimating parameters of a quantum channel is to probe the channel many times sequentially with the help of coherent ancillary systems. However, finding the…
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Shaping of the finite-size chaos crossover in Floquet circuits by coherent-mismatch architecture
arXiv quant-ph
arXiv:2609.31391v1 Announce Type: new Abstract: We study how the spatial profile of a deterministic coherent gate perturbation affects finite-size quasienergy statistics and operator dynamics in U(1)-symmetric XXZ Floquet circuits. Using a…
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Complexity Barriers to State Preparation in Quantum Approximate Optimization
arXiv quant-ph
arXiv:2609.31520v1 Announce Type: new Abstract: For many important optimization problems we are restricted to approximate solutions in practice due to computational complexity. Distinct from the exact optimization setting, approximate…
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Scalable Hybrid Device Architecture on Thin-Film Lithium Tantalate for Long Distance Quantum Network Nodes with Atomic Frequency Comb Quantum Memories
arXiv quant-ph
arXiv:2609.31598v1 Announce Type: new Abstract: Scalable photonic circuits are essential for realizing practical quantum networks beyond proof-of-principle demonstrations. Although diamond-based integrated photonics has been extensively…
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Quantum many-body operator cascade as a route to chaos
arXiv quant-ph
arXiv:2604.16720v2 Announce Type: replace-cross Abstract: We describe a chaos scenario valid for chaotic many-body quantum systems, the simulation of which is one of the prime candidates for demonstrating quantum advantage, and clarify its…
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Sharp Data-Processing Region for Quantum Conditional R\'enyi Entropies
arXiv quant-ph
arXiv:2609.31350v1 Announce Type: new Abstract: We study the three-parameter family of quantum conditional R\'enyi entropies $H_{\alpha,z}^\lambda$ introduced in \textit{Commun. Math. Phys.} 407, 180 (2026). We prove that the previously…
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Quantum interaction can superactivate cheating under parallel repetition
arXiv quant-ph
arXiv:2609.31223v1 Announce Type: new Abstract: We study interactive multiprover games and many-round protocols in which the communication between the verifier and the provers is quantum. Parallel repetition is known to suppress soundness…
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Causal Query Compression for Lindblad Dynamics: Optimal Queries and Nearly Linear Local Simulation
arXiv quant-ph
arXiv:2609.31312v1 Announce Type: new Abstract: We construct a causal query compiler for time-dependent Lindblad dynamics and establish query and gate bounds under distinct input models. With coherent block encodings of the Hamiltonian and…
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Synchronizing Spectral and Interference Criticalities at an Exceptional Point
arXiv quant-ph
arXiv:2609.30311v1 Announce Type: cross Abstract: Exceptional points (EPs) are spectral singularities, but whether they can be used to control a distinct criticality of coherent interference remains largely unexplored. Here we show in…
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Disentangling the Toric Code
arXiv quant-ph
arXiv:2609.30363v1 Announce Type: cross Abstract: Commuting-projector Hamiltonians with integer spectrum such as the 1+1d Ising ferromagnet and the 2+1d toric code may be regarded as the generators of non-on-site $U(1)$ symmetries. In this…
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Genuine Multi-Entropy of Fully Symmetric Gaussian States
arXiv quant-ph
arXiv:2609.30754v1 Announce Type: cross Abstract: We study the tri-partite genuine R\'enyi multi-entropy of fully symmetric Gaussian states as a function of the squeezing parameter for different total number of bosonic modes under…
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Electron lattice potentials for ultracold atoms using circular Rydberg orbitals
arXiv quant-ph
arXiv:2609.31267v1 Announce Type: cross Abstract: Recent advances in experiments using individually trapped atoms have enabled precise control over circular Rydberg electrons with exceptionally long lifetimes. We show that these giant and…
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A Scalable, Optimized Scheduler for the Active Volume Architecture
arXiv quant-ph
arXiv:2603.06376v2 Announce Type: replace Abstract: We improve the accuracy of Active Volume resource estimates by explicitly scheduling when Active Volume blocks execute and when their reactions complete. We present a cycle-accurate…
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Variational quantum state preparation within an entangle-rotate circuit framework for quantum-enhanced metrology in noisy systems
arXiv quant-ph
arXiv:2604.15209v2 Announce Type: replace Abstract: We investigate the generation of quantum states for precision metrology in noisy two-level systems. These states are obtained by optimizing a variational quantum circuit to maximize the…
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Fermion lattices can be simulated by same-size qubit lattices with $\mathcal{O}(1)$ interaction overhead
arXiv quant-ph
arXiv:2605.12600v2 Announce Type: replace Abstract: Local interactions among electrons underlie many complex properties of correlated materials. While the Jordan-Wigner transformation can preserve this locality along one spatial dimension…
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Selection rules for pinned and quasipinned occupation numbers with degeneracy
arXiv quant-ph
arXiv:2609.22010v3 Announce Type: replace Abstract: When the natural occupation numbers of a fermionic state saturate a generalized Pauli constraint, the state obeys a selection rule: only those configurations of natural orbitals that…
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Gaussian quantum reservoir computing with a hybrid cavity magnomechanical system
arXiv quant-ph
arXiv:2609.22791v2 Announce Type: replace Abstract: We propose a quantum reservoir computing framework based on a hybrid cavity magnomechanical system in the linearized Gaussian regime. The reservoir combines microwave-cavity, magnon, and…
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Dynamical, thermal, and ground-state multiparameter quantum metrology: Fundamental limits and their attainability in magnetometry
arXiv quant-ph
arXiv:2609.25977v2 Announce Type: replace Abstract: We consider the simultaneous estimation of multiple parameters in Hamiltonians of the form $H_{\vec{\theta}}= H_{\vec{\theta}}^P + H^C$, where $H_{\vec{\theta}}^P$ encodes the unknown…
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Universal classical and quantum fluctuations in the large deviations of current of noisy quantum systems: Quantum symmetric simple exclusion and inclusion processes
arXiv quant-ph
arXiv:2601.16883v2 Announce Type: replace-cross Abstract: We study the fluctuation statistics of integrated currents in noisy quantum diffusive systems, focusing on the Quantum Symmetric Simple Exclusion and Inclusion Processes…
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The Schrodinger Equation as a Gauge Theory
arXiv quant-ph
arXiv:2604.26016v3 Announce Type: replace-cross Abstract: The conserved probability current of the Schrodinger field admits a dimension-dependent gauge representation that provides a convenient setting for comparing hydrodynamic…
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Construction of Partial Join Graphs with Perfect State Transfer in Shunt Decomposition-Based Quantum Walks
arXiv quant-ph
arXiv:2609.30490v1 Announce Type: new Abstract: In this paper, we define directed partial join graphs with signed couplings and construct discrete-time quantum-walk transition operators for these graphs using the shunt-decomposition…
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Room-temperature quantum-sensing molecular crystals grown in minutes
arXiv quant-ph
arXiv:2609.30899v1 Announce Type: new Abstract: Quantum sensing increasingly demands materials combining room-temperature optical spin addressability and coherent control with rapid, accessible fabrication. Yet semiconductor platforms…
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COFI-DQI: Curve-based Optimal Function Intersection via Decoded Quantum Interferometry
arXiv quant-ph
arXiv:2609.31484v1 Announce Type: cross Abstract: In 2025, Jordan et al. introduced Decoded Quantum Interferometry (DQI), a quantum algorithm for combinatorial optimization based on decoding. They considered Reed-Solomon decoding and its…
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Dissipative Effects in Transmission Line Analogues of Hawking Radiation
arXiv quant-ph
arXiv:2606.28505v2 Announce Type: replace Abstract: Hawking radiation is a fundamental result of quantum field theory in curved spacetime, yet its direct observation remains beyond current experimental capabilities. Circuit quantum…
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The Prepare and Broadcast Scenario
arXiv quant-ph
arXiv:2606.28632v2 Announce Type: replace Abstract: We introduce the dimension-restricted prepare and broadcast (PAB) scenario, which generalizes standard prepare-and-measure frameworks. Here, the system prepared by a sender undergoes a…
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When Complementary Measurements Count the Same Classical Bit Twice: Counterexamples to CQC, ECQC, and Complementarity-Based Certification
arXiv quant-ph
arXiv:2608.03828v3 Announce Type: replace Abstract: Mutually unbiased measurements are commonly expected to expose independent facets of a quantum state: a correlation that is classical in one basis should disappear in a complementary…
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Non-abelian quantum cellular automata: $1{+}1$-dimensional $SU(2)$ Yang--Mills with fermions
arXiv quant-ph
arXiv:2609.30285v1 Announce Type: new Abstract: This work provides a digital quantum simulation scheme for $1{+}1$-dimensional $SU(2)$ Yang--Mills theory with Dirac fermions. It takes the form of a quantum circuit, infinitely repeating…
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Magnetic long-range order at finite temperature in two-dimensional hyperbolic lattices
arXiv quant-ph
arXiv:2606.27422v2 Announce Type: replace-cross Abstract: Infrared singularities of gapless Goldstone modes preclude magnetic long-range order at finite temperature in conventional two-dimensional systems. By studying the spin-$S$…
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A Three-Party W-State Quantum Secret Sharing Protocol with X-Gate Encoding and Forbidden-Outcome Detection
arXiv quant-ph
arXiv:2609.31472v1 Announce Type: new Abstract: We develop a new three-party quantum secret-sharing (QSS) protocol based on a three-qubit W state. This protocol encodes the secret-sequence bits using X gates and employs randomly selected…
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Factorisation conditions and causality for local measurements in QFT
arXiv quant-ph
arXiv:2511.21644v3 Announce Type: replace Abstract: Quantum operations that are perfectly admissible in non-relativistic quantum theory can enable signalling between spacelike separated regions when naively imported into quantum field…
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Three-uniform edge-ordered hypergraph quantum states: entanglement and its relation to hypergraph properties
arXiv quant-ph
arXiv:2609.30399v1 Announce Type: new Abstract: The encoding of 3-uniform edge-ordered weighted hypergraphs into multiqubit quantum states is proposed. We derive an analytical expression for the geometric measure of entanglement of…
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Frequency- and Power-Dependent Optical Response of a Cesium Rydberg Microwave Receiver
arXiv quant-ph
arXiv:2609.31241v1 Announce Type: new Abstract: We show experimentally obtained frequency- and power-dependent optical response of a room-temperature cesium vapor cell used as a Rydberg microwave receiver based on electromagnetically…
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Locality and filter design for dissipative ground-state preparation
arXiv quant-ph
arXiv:2609.31266v1 Announce Type: new Abstract: Ground-state preparation is a fundamental challenge in quantum many-body physics, chemistry and materials science. Dissipative state-preparation techniques engineer a Lindbladian coupling to…
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Informational and algebraic renormalization group
arXiv quant-ph
arXiv:2609.30362v1 Announce Type: cross Abstract: Renormalization group (RG) is a core concept in physics from statistical mechanics to quantum field theory, yet its schemes differ widely between field theory and many-body physics. We…
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Angular momentum conservation in two-atom superradiance
arXiv quant-ph
arXiv:2609.31433v1 Announce Type: new Abstract: Two-atom superradiance is studied for atoms having a J=0 ground state and a J=1 excited state. The atoms lie on the x-axis and are excited by a \sigma_{+}-polarized laser pulse propagating in…
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Planar Contact Structures with Calabi-Yau Fillings and Topological Quantum Computation
arXiv quant-ph
arXiv:2609.30406v1 Announce Type: cross Abstract: We study planar open books obtained by lifting braids through branched covers of the disk D^2, together with the quantum operations in the Ising representation. We note a criterion for the…
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Bounded information as a foundation for quantum theory
arXiv quant-ph
arXiv:2506.18549v3 Announce Type: replace Abstract: The purpose of this paper is to formalize the concept that best synthesizes our intuitive understanding of quantum mechanics - that the information carried by a system is limited - and…
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Removing nodal and support-mismatch pathologies in Variational Monte Carlo via blurred sampling
arXiv quant-ph
arXiv:2603.18148v2 Announce Type: replace-cross Abstract: Variational Monte Carlo (VMC) is a powerful and fast-growing method for optimizing and evolving parameterized many-body wave functions, especially with modern neural-network quantum…
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Discovery of an intrinsic non-Hermitian phase transition in a bulk condensed-matter system
arXiv quant-ph
arXiv:2412.16012v2 Announce Type: replace-cross Abstract: Across regular phase transitions, systems remain in thermal equilibrium. However, when a system is driven far from equilibrium, non-Hermitian phase transitions may arise where the…
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Problem-informed Graphical Quantum Generative Learning
arXiv quant-ph
arXiv:2405.14072v3 Announce Type: replace Abstract: Leveraging the intrinsic probabilistic nature of quantum systems, generative quantum machine learning (QML) offers the potential to outperform classical learning models. Current…
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Solving Graph Coloring Problems Using Feedback-Based Algorithm for Quantum Optimization
arXiv quant-ph
arXiv:2609.30991v1 Announce Type: new Abstract: The feedback-based algorithm for quantum optimization (FALQON), which is an extension of the quantum approximate optimization algorithm (QAOA), is a promising approach for finding approximate…
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Counterdiabatic quantum optimization for efficient state preparation in the Schwinger model
arXiv quant-ph
arXiv:2609.31400v1 Announce Type: cross Abstract: The Quantum Approximate Optimization Algorithm (QAOA), whose design is underpinned by the adiabatic theorem, is one of the leading variational quantum algorithms for preparing the ground…
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Spatiotemporal Non-Hermitian Skin Effect with Floquet-Engineered Ultracold Atoms
arXiv quant-ph
arXiv:2609.31474v1 Announce Type: cross Abstract: Non-Hermitian skin effect, the accumulation of bulk eigenstates at edges under open boundary conditions, has been observed across classical, quantum, and synthetic platforms. Whether it can…
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Measurement-Based Uncomputation from an Error Correction Perspective
arXiv quant-ph
arXiv:2609.31605v1 Announce Type: new Abstract: Coherent uncomputation can be as costly as the computation itself, creating substantial spacetime overheads that can be prohibitive on early fault-tolerant quantum computers. We develop an…
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Fully passive monolithic silicon quantum photonic circuit for entangled photon-pair generation
arXiv quant-ph
arXiv:2609.29420v1 Announce Type: cross Abstract: Integrated quantum photonic circuits are a key enabling technology for the scalability of quantum information systems. Among the available platforms, silicon photonics offers an unrivalled…
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Restricting Trainable Lie-Algebra Growth in Equivariant Quantum Networks via Hierarchical Ancilla-Controlled Subspace Projections
arXiv quant-ph
arXiv:2609.30283v1 Announce Type: new Abstract: Equivariant quantum networks encode symmetry as an inductive bias, which can improve generalization and may also favor optimization convergence. Equivariance alone, however, does not…
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A Mechanism for the R\'enyi Hierarchy of Decoherence-Induced Phase Transitions
arXiv quant-ph
arXiv:2609.30377v1 Announce Type: new Abstract: Decoherence-induced phase transitions (DIPTs) are associated with singular changes in a quantum system's entanglement structure as the decoherence strength varies. In many cases, their…
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Disentangling Expressibility, Symmetry Protection, and Hardware Noise in Variational Quantum Simulation of the Two-Flavor Schwinger Model
arXiv quant-ph
arXiv:2609.30496v1 Announce Type: new Abstract: Existing quantum simulations of the two-flavor Schwinger model have run at a single lattice size, and it is not known how far the variational approach can be pushed or which weakness stops it…
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Encryptability As a Coordinate Choice: Depth-One Homomorphic Federated Learning of Quantum Neural Networks
arXiv quant-ph
arXiv:2609.30581v1 Announce Type: new Abstract: Encrypted training relies on keeping server-side updates low-degree. This constraint traditionally excludes models whose weights inhabit a compact Lie group (notably variational quantum…
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Non-factor quantum dynamics and relativity
arXiv quant-ph
arXiv:2609.30942v1 Announce Type: new Abstract: We consider the effect of relativistic principles on the structure of the local evolutions of non-factor quantum systems such as those which naturally arise in quantum spacetimes and causal…