Quantum Computing
Quantum Computing news — Friday 02 October 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
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Quantum in Business Conference Highlights Commercial Quantum Applications
The Quantum Insider
Insider Brief EPB Quantum’s Quantum in Business conference in Chattanooga brought together more than 450 business leaders, researchers, technology innovators and public officials to discuss commercial quantum applications. IonQ and EPB…
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QEst Hack Invites Participants to Test Quantum Algorithms on Real Business Problems
The Quantum Insider
Insider Brief Metrosert is inviting companies, students, researchers and other participants from the Nordic and Baltic countries to apply for QEst Hack 2026 in Tallinn from November 11–13. Five companies will bring real business problems…
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New Method Generates Photons That Are Virtually Indistinguishable
The Quantum Insider
Insider Brief Researchers improved the similarity of photons generated by semiconductor quantum dots, advancing light sources for quantum communication and information processing. An optical cavity controlled and accelerated photon…
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US Department of Energy Releases National Quantum Roadmap Establishing 2028 Fault-Tolerance Milestones
Quantum Computing Report
The U.S. Department of Energy (DOE) has released its National Quantum Roadmap, aiming for error-corrected quantum computing by 2028. This strategy shifts focus from qubit counts to demonstrated scientific utility, with a three-phphased…
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Fermilab SQMS Center Identifies Microscopic Origins of Qubit Performance Variance Across Superconducting Transmons
Quantum Computing Report
Researchers at Fermilab's SQMS Center and collaborators identified microscopic material defects causing performance variations in superconducting qubits. Their study found that nanoscale fabrication geometries, surface oxides, and energy…
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SQC and Schneider Electric Advance Quantum-Enhanced Energy Forecasting
The Quantum Insider
Insider Brief Silicon Quantum Computing and Schneider Electric advanced to Stage 2 of Australia’s Critical Technologies Challenge Program with A$3.6 million in funding to expand their quantum-enhanced energy forecasting work with UNSW…
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Quantum Computing Could Cut Industrial Emissions Without an AI-Sized Footprint, BCG Finds
The Quantum Insider
Insider Brief Quantum computing could support cleaner energy and industrial processes with a relatively small emissions footprint, according to a BCG study. BCG estimates that fully deployed quantum-enabled technologies could prevent 3…
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ORNL Develops LuGo Algorithm on Frontier Supercomputer, Reducing Quantum Circuit Gate Counts by 95% for Computational Fluid Dynamics
Quantum Computing Report
Scientists at Oak Ridge National Laboratory (ORNL) developed LuGo, an algorithm that significantly reduces the number of quantum gate operations needed for computational fluid dynamics (CFD) by over 95%. This was achieved by using…
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The Conversation: 100 Years Ago, Schrödinger’s Equation Shed Light on Quantum Physics – Scientists Use it Today to Fine‑Tune Chemical Reactions
The Quantum Insider
By Sophya Garashchuk , Professor of Chemistry and Biochemistry, University of South Carolina For The Conversation The objects you interact with every day are predictable – you can pick up a box, sit down in a chair without falling to the…
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Sharp Target-Domain Certificates for Quantum-Kernel Advantage under Distribution Shift
arXiv quant-ph
arXiv:2610.00080v1 Announce Type: new Abstract: Quantum predictive advantage under shift usually requires known target labels. We derive the assumption-free sharp identified interval for the finite-batch advantage of a fixed candidate over…
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Predicting electric-field noise in ion traps using fluctuation electrodynamics
arXiv quant-ph
arXiv:2610.01693v1 Announce Type: new Abstract: Electric-field noise in microfabricated surface ion traps contributes to gate errors in trapped-ion quantum computers, but this noise has been challenging to predict. Here, we present a…
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UNIQ: Communication-Efficient Distributed Quantum Computing via Unified Nonlinear Integer Programming
arXiv quant-ph
arXiv:2512.00401v2 Announce Type: replace Abstract: Distributed quantum computing (DQC) is widely regarded as a promising approach to overcome quantum hardware limitations. A major challenge in DQC lies in reducing the communication cost…
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Random Quantum Circuits Beyond Moment Matching
arXiv quant-ph
arXiv:2610.02135v1 Announce Type: new Abstract: Random quantum circuits aim to efficiently reproduce the statistical properties of ideal random quantum evolution. One approach is to construct approximate unitary designs, which match the…
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Graph Neural Post-selection for Quantum Error Correction
arXiv quant-ph
arXiv:2610.00504v1 Announce Type: new Abstract: Post-selection improves the logical reliability of quantum computation by rejecting shots which are likely to result in logical failure. We introduce graph neural networks that predict…
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Learning Many-Body Hamiltonians Using a Local Probe
arXiv quant-ph
arXiv:2610.02157v1 Announce Type: new Abstract: Hamiltonian learning provides a systematic framework for reconstructing unknown quantum dynamics. However, existing protocols typically assume direct measurement access to the entire system…
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Attosecond current control and timing in a scanning tunnelling microscope
arXiv quant-ph
arXiv:2507.10252v5 Announce Type: replace Abstract: Quantum tunnelling of electrons can be confined to the sub-cycle time scale of strong light fields, contributing decisively to the extreme time resolution of attosecond science. Because…
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Circuit-Level Loss Performance of RHG and Foliated Floquet Color Codes in a Compound Photon--Atom Quantum Architecture
arXiv quant-ph
arXiv:2609.02428v2 Announce Type: replace Abstract: A central question for fault-tolerant quantum computing is which quantum error-correcting codes are best suited to a given hardware architecture. Here we compare the…
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Theory of Out-of-Time-Ordered Transport
arXiv quant-ph
arXiv:2512.11198v3 Announce Type: replace-cross Abstract: We construct an effective field theory (EFT) that captures the universal behavior of out-of-time-order correlators (OTOCs) at late times in generic quantum many-body systems with…
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Noisy Quantum Query Complexity via Fractional Block Sensitivity
arXiv quant-ph
arXiv:2610.00506v1 Announce Type: new Abstract: We study quantum query complexity under several models of imperfect oracle access, and develop lower bounds through a common framework based on fractional block sensitivity (\(\fbs\)). For a…
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(A Variant of) Clifford Circuit Synthesis is NP-Complete
arXiv quant-ph
arXiv:2610.02029v1 Announce Type: new Abstract: Optimal circuit synthesis is the problem of finding the shortest-depth circuit representation of a given functionality with respect to a pre-specified elementary gate set. This is a central…
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Simultaneous Perturbation as a Spectral Filter
arXiv quant-ph
arXiv:2610.00201v1 Announce Type: new Abstract: Parameterized quantum circuits require repeated measurements to estimate objective gradients, making the number of circuit evaluations a central resource. Simultaneous perturbation stochastic…
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Zero- Versus Infinite-Temperature Damping in Variational Quantum Circuits: Feature Scale, Sampling Cost, and Frame Gauge
arXiv quant-ph
arXiv:2610.01466v1 Announce Type: new Abstract: The Pauli twirl of amplitude damping (AD) is generalized amplitude damping at infinite temperature: it keeps the contraction of AD and removes its non-unital term, so comparing the two in…
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Nonlinear collective-spin dynamics for quantum-enhanced sensing in solid-state platforms
arXiv quant-ph
arXiv:2610.00286v1 Announce Type: new Abstract: Collective spin systems in solid-state materials are promising platforms for quantum-enhanced sensing. In systems such as nitrogen-vacancy centers in diamond, donor spins in silicon, and…
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Inverse Problem of Alchemical Resource Theory: Replication and Universal Simulation Single Out Imaginarity and Parity Asymmetry
arXiv quant-ph
arXiv:2609.12988v2 Announce Type: replace Abstract: Quantum resource theories usually begin with a prescribed free structure and ask what tasks become possible when a resource is supplied. We study the inverse problem of alchemical…
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Coherence Rather Than Error Rate Governs Privacy in Multi-Tenant Quantum Computing
arXiv quant-ph
arXiv:2609.34411v2 Announce Type: replace Abstract: Multi-tenant computing enables providers of commercial cloud quantum processors to rent disjoint sectors of a device to independent users. Average gate error, which cloud quantum…
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Robust exponential lower bounds for fermionic and bosonic Gaussian ranks
arXiv quant-ph
arXiv:2610.02172v1 Announce Type: new Abstract: The power and limitations of classical simulation are central to understanding quantum computational advantages. A leading simulation paradigm is based on coherent decomposition into…
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Hierarchy of discriminative power and complexity in learning quantum ensembles
arXiv quant-ph
arXiv:2601.22005v2 Announce Type: replace Abstract: Distance metrics are central to machine learning, yet distances between ensembles of quantum states remain poorly understood due to fundamental quantum measurement constraints. We…
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Experimentally realized local-global tradeoff in quantum resources
arXiv quant-ph
arXiv:2609.40033v2 Announce Type: replace Abstract: The interconversion among different quantum resources has attracted considerable attention, exemplified by the tradeoff between coherence and entanglement. However, the relationship…
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Variance reduction for forces and pressure in variational Monte Carlo
arXiv quant-ph
arXiv:2603.14521v2 Announce Type: replace-cross Abstract: We present simple and practical strategies to reduce the variance of Monte Carlo estimators. Our focus is on variational Monte Carlo calculations of atomic forces and pressure in…
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Adaptivity is all you need: Optimal stabilizer learning using just single-copy measurements
arXiv quant-ph
arXiv:2610.02031v1 Announce Type: new Abstract: Stabilizer states are central to quantum computing, underlying quantum error correction, benchmarking, and efficient classical simulation. Yet their learnability exhibits a striking gap: an…
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Universal Bound and Phase Transition in Many-Body Fermionic Non-Gaussianity
arXiv quant-ph
arXiv:2610.02075v1 Announce Type: new Abstract: Fermionic non-Gaussianity is a resource for universal quantum computation that can be generated by interactions in quantum many-body systems. Using the magic R\'enyi entropy (MRE) as a…
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Algebraic Relaxation of Strong-to-Weak Symmetry-Breaking Order via Charge-Sector Broadening
arXiv quant-ph
arXiv:2610.00474v1 Announce Type: cross Abstract: Strong-to-weak spontaneous symmetry breaking (SW-SSB) is a distinctive phenomenon of mixed quantum states, characterized by nonlinear long-range order associated with strong symmetry. In…
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Certifying quantum states without independence assumptions
arXiv quant-ph
arXiv:2606.31913v2 Announce Type: replace Abstract: Standard quantum verification and certification protocols often assume that experimental sources emit independent and identically distributed (i.i.d.) states. In realistic scenarios…
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A Gate-Based Quantum Computing Framework for Codon Optimization
arXiv quant-ph
arXiv:2610.00887v1 Announce Type: new Abstract: Codon optimization is a challenging combinatorial optimization problem with important applications in synthetic biology, protein expression, and biotechnology. While quantum annealing has…
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Sparse Hamiltonian simulation with optimal dependence on the maximum column Euclidean norm
arXiv quant-ph
arXiv:2610.02030v1 Announce Type: new Abstract: We give a quantum algorithm for simulating a $d$-sparse Hermitian Hamiltonian $H$, assuming a known upper bound $\Lambda$ on its maximum column Euclidean norm $\|H\|_{1\to2}$. For…
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Spiking neural networks for streaming qubit readout
arXiv quant-ph
arXiv:2610.02129v1 Announce Type: new Abstract: Fast and accurate qubit-state assignment is essential for feedback, calibration, and error correction in quantum processors. In superconducting platforms, frequency-multiplexed readout makes…
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Quantum algorithms for general nonlinear dynamics based on the Carleman embedding
arXiv quant-ph
arXiv:2509.07155v2 Announce Type: replace Abstract: Important nonlinear dynamics, such as those found in plasma and fluid systems, are typically hard to simulate on classical computers. Thus, if fault-tolerant quantum computers could…
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Exact entanglement trade-offs in qutrit and composite-dimensional stabilizer states
arXiv quant-ph
arXiv:2605.05167v3 Announce Type: replace Abstract: When absolute maximal entanglement is unavailable in a state family, different objectives can select different distributions of residual entanglement. We determine exact trade-offs for…
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Dissipation-Enabled Operator-Norm Locality Bounds for Bose-Hubbard Hamiltonians
arXiv quant-ph
arXiv:2610.01669v1 Announce Type: new Abstract: Closed bosonic lattice systems do not generally admit operator norm Lieb--Robinson bounds uniformly in the initial state. The reason is that the information propagation velocity can grow with…
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Efficiently Optimizing the Quantum Value of Bell Inequalities using Batched Gradient Descent
arXiv quant-ph
arXiv:2610.01699v1 Announce Type: new Abstract: Exploring the world of Bell inequalities requires numerical methods that scale effectively with the number of parties, inputs, and outputs. Such methods can be used to study large-scale Bell…
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A computational phase diagram for the transverse field Ising model
arXiv quant-ph
arXiv:2610.02079v1 Announce Type: new Abstract: We study the transverse field Ising model, defined by the Hamiltonian $H =\frac{1}{2}\sum_{i, j\in [n]} J_{ij} Z_i Z_j +\sum_{i=1}^n h_i^z Z_i + \eta\sum_{i} X_i$ where $J $ is the symmetric…
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Quantum key distribution using generalized contextuality against post-quantum eavesdroppers
arXiv quant-ph
arXiv:2610.00595v1 Announce Type: new Abstract: Bell nonlocality allows secret key to be certified without trusting the internal operation of the devices, and even against eavesdroppers constrained only by the no-signaling principle. We…
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Stark effect of hydrogenic ions as a test of the indefinite-metric formalism of the eight-component relativistic wave equation for spin-$\frac{1}{2}$ particles
arXiv quant-ph
arXiv:2610.02060v1 Announce Type: cross Abstract: The eight-component relativistic wave equation for spin-$\frac{1}{2}$ particles of Robson and Staudte (FV$\frac{1}{2}$), a Feshbach--Villars linearization of the Feynman--Gell-Mann…
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Verifiable quantum advantage in extremely low depth
arXiv quant-ph
arXiv:2609.01448v2 Announce Type: replace Abstract: We give a sampling problem that is solvable by shallow quantum circuits, hard for polynomial-time classical algorithms under lattice-based assumptions, and efficiently verifiable by a…
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All-Microwave Multiqubit Gates
arXiv quant-ph
arXiv:2609.39834v2 Announce Type: replace Abstract: Implementing high-fidelity multiqubit gates is critical for reducing circuit depth in near-term quantum processors and fault-tolerant architectures. However, realizing multiqubit…
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Horizons and Soft Quantum Information
arXiv quant-ph
arXiv:2512.20754v2 Announce Type: replace-cross Abstract: It was recently shown that black holes decohere any quantum superpositions in their vicinity. This decoherence is mediated by soft radiation through the horizon, and can be…
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Strong Simulation of 1D Quantum Circuits via Reduced Transition Matrices
arXiv quant-ph
arXiv:2610.02082v1 Announce Type: new Abstract: Tensor networks are powerful tools for simulating quantum many-body systems, but the growth of spatial entanglement severely limits the direct evolution of pure states under chaotic unitary…
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Clifford-hierarchy stabilizer formalism with applications to twisted quantum doubles
arXiv quant-ph
arXiv:2610.00464v1 Announce Type: new Abstract: Recent work has shown that quantum double models can be used to circumvent the Bravyi-Koenig bound. In particular, this is achieved through code-switching protocols in which non-Pauli…
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Electromagnetic Side-Channel Vulnerability in QKD Equipment
arXiv quant-ph
arXiv:2610.01609v1 Announce Type: new Abstract: Actual quantum key distribution network nodes may be vulnerable to side-channel attacks such as electromagnetic leakage. In this study, we measured electromagnetic emissions from a prototype…
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Thin-capping layer epitaxial quantum dots for near-field quantum photonics
arXiv quant-ph
arXiv:2610.02080v1 Announce Type: cross Abstract: Epitaxial quantum dots (QDs) are widely recognised as one of the best quantum light sources, given their good stability, brightness, quantum efficiency and coherence. To reach such…
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Loss-tolerant distributed lattice surgery using fusion networks
arXiv quant-ph
arXiv:2610.01923v1 Announce Type: new Abstract: Networking matter-based quantum processing units (QPUs) offers a promising route to scaling fault-tolerant quantum computers. This requires distributed logical operations to be performed…
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Entanglement of quantum systems via a classical mediator in hybrid van Hove theory
arXiv quant-ph
arXiv:2601.21555v2 Announce Type: replace Abstract: It is a matter of ongoing discussion whether quantum states can become entangled while only interacting via a classical mediator. This lively debate is deeply interwoven with the question…
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Smooth perturbation theory and generic Cantor spectrum for multi-dimensional monotone quasiperiodic operators
arXiv quant-ph
arXiv:2610.00733v1 Announce Type: cross Abstract: We consider multi-dimensional quasiperiodic Schr\"odinger operators with monotone sawtooth-type potentials in the perturbative localization regime. We prove that a given gap is closed iff a…
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Algebraic structure in holographic tensor networks
arXiv quant-ph
arXiv:2610.00478v1 Announce Type: cross Abstract: In a previous work 2511.21852, we explored the hypothesis that in general theories of quantum gravity, spacetime regions known as generalized entanglement wedges (introduced by Bousso and…
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Ballistic Speed and Potential-Theoretic Recurrence for Homogeneous Open Quantum Random Walks
arXiv quant-ph
arXiv:2610.01844v1 Announce Type: cross Abstract: Our study connects root-mean-square ballistic transport to potential-theoretic recurrence for finite-range open quantum random walks. In homogeneous walks with primitive local channels…
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A Noise Operator Approach to Quantum Query Complexity and Time-Space Tradeoff Lower Bounds
arXiv quant-ph
arXiv:2609.40334v2 Announce Type: replace-cross Abstract: Time and space (memory) are two of the most important measures of cost in computation, even more so for quantum computation. Yet, our tools for proving unconditional quantum…
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The Markov Marginal Problem for Density Operators
arXiv quant-ph
arXiv:2605.19453v3 Announce Type: replace Abstract: We study when local reduced density operators, viewed as quantum marginals, can be assembled into a global quantum state with a prescribed Markov structure. The starting point is a…
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Planted Cliques and Quantum Symmetry-Adapted Measurements
arXiv quant-ph
arXiv:2609.40310v2 Announce Type: replace Abstract: The planted clique problem is a promising candidate for quantum advantage with a wide computational-statistical gap and substantial evidence for classical hardness. We study two quantum…
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A low-energy effective Hamiltonian for Landau quasiparticles: I. A unified theory of transport and superfluidity in Fermi liquids
arXiv quant-ph
arXiv:2511.15938v3 Announce Type: replace-cross Abstract: We introduce a new renormalisation scheme to construct the Landau quasiparticles of Fermi fluids. The scheme introduces an energy cutoff $\Lambda$ to remove the resonant couplings…
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Symmetry Discovery in Quantum Learning: Observable-Level and Task-Level Inference from Finite Measurements
arXiv quant-ph
arXiv:2610.00157v1 Announce Type: new Abstract: Symmetry reduces the capacity of a quantum learning model, but the imposed group must match both the measured information and the label transformation. We establish a finite-measurement…
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Projector Form of the Quantum Brachistochrone and Its Relation to Two-Boundary Quantum Algorithm Design
arXiv quant-ph
arXiv:2610.00169v1 Announce Type: new Abstract: We clarify the relation between the time-optimal quantum evolution of Carlini et al. and the coherent two-boundary optimal-control formulation recently proposed for quantum algorithm design.
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Finite-blocklength classical communication over the quantum erasure channel with and without classical feedback
arXiv quant-ph
arXiv:2610.00440v1 Announce Type: new Abstract: We determine the optimal success probability for transmitting a fixed number of classical messages through a finite number of uses of the quantum erasure channel, assisted by noiseless…
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Quantum gates from the middle convolution of twisted Burau representations
arXiv quant-ph
arXiv:2610.00293v1 Announce Type: new Abstract: We study braid representations obtained from character-twisted Burau inputs by the Katz-Long-Moody (KLM) construction, which corresponds to multiplicative middle convolution for KZ-type…
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Quantum Secret Sharing and Error Correction vs No-Cloning
arXiv quant-ph
arXiv:2610.00441v1 Announce Type: new Abstract: Secret sharing is ubiquitous throughout cryptography. All possible access structures are classically feasible, and in the case of threshold access structures, the protocols are even very…
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Factor Code Networks
arXiv quant-ph
arXiv:2610.00469v1 Announce Type: new Abstract: For a quantum code defined by an isometry $T:H_{\rm code} \to H_{\rm phys}$, an operator map is a *-homomorphism $\varphi: B(H_{\rm code}) \to B(H_{\rm phys})$ from the space of operators on…
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Causal Trade-Offs in Superluminal Extensions of Relativity. A no-go theorem
arXiv quant-ph
arXiv:2610.00494v1 Announce Type: new Abstract: Extensions of relativity that include superluminal reference frames have recently been proposed by Dragan and Ekert as a way to reconcile relativistic symmetry with quantum uncertainty. In…
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Blind Unforgeability implies Plus-One Unforgeability
arXiv quant-ph
arXiv:2610.00517v1 Announce Type: new Abstract: We prove that quantum blind-unforgeability implies quantum plus-one unforgeability, settling an open question in the literature. Since plus-one unforgeability is known not to imply…
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Polynomial-time local-unitary equivalence of graph states
arXiv quant-ph
arXiv:2610.00527v1 Announce Type: new Abstract: Local-unitary (LU) equivalence asks whether two quantum states differ only by independent changes of basis on their qubits. For graph states, whether this relation can be decided in…
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Quantum Krylov Learning
arXiv quant-ph
arXiv:2610.00537v1 Announce Type: new Abstract: The Hamiltonian of a natural quantum system is usually determined indirectly, by proposing microscopic models and comparing their predicted observables with experiment. A more direct approach…
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Negative quasiprobabilities redistribute (and complex ones reduce) the information in unabsorbed photons
arXiv quant-ph
arXiv:2610.00740v1 Announce Type: new Abstract: Negative Kirkwood--Dirac quasiprobabilities are credited with the quantum advantage of interaction-free measurement and postselected metrology. We test that claim on the task interaction-free…
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esQueranto: Differentiable Structured Quantum Light for Automated Scientific Discovery
arXiv quant-ph
arXiv:2610.00750v1 Announce Type: new Abstract: Uncovering new phenomena in nature requires experiments. For centuries, their design has been exclusively a human endeavor. Today, a new paradigm is emerging in which artificial intelligence…
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Neural Fourier Surrogates for Data Reuploading Quantum Neural Networks
arXiv quant-ph
arXiv:2610.00841v1 Announce Type: new Abstract: For quantum machine learning, the exact boundary between classical and quantum advantage is still poorly understood. Direct comparison between quantum neural networks (QNNs) and existing…
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Beyond IP = PSPACE and QIP = PSPACE: Interactive Proofs in Arbitrary Physical Theories
arXiv quant-ph
arXiv:2610.00847v1 Announce Type: new Abstract: The equalities IP = PSPACE and QIP = PSPACE, the latter achievable with three messages, raise a basic question: how much of an interactive proof's power comes from the underlying physical…
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Sublinear-depth Quantum Simulation of Electrons with Atomic Orbitals
arXiv quant-ph
arXiv:2610.00950v1 Announce Type: new Abstract: Discretizing electronic degrees of freedom into atomic orbitals is the default choice to accurately model electrons in molecules in a compact and flexible way. We consider the task of…
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Exact $T$-counts of Toffoli layers from an isotropy bound
arXiv quant-ph
arXiv:2610.01024v1 Announce Type: new Abstract: The $T$-count is the dominant cost of fault-tolerant Clifford+$T$ computation. We prove that a layer of $m$ disjoint CCZ gates, the diagonal core of a parallel Toffoli layer, needs exactly…
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Learned Parallel Bit-Flipping Sequential Belief Propagation Decoding of Quantum LDPC Codes
arXiv quant-ph
arXiv:2610.01068v1 Announce Type: new Abstract: Quantum low-density parity-check (QLDPC) codes are promising candidates for low-overhead fault-tolerant quantum computation, but their practical use requires fast, low-complexity, and…
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The stationarity test: a framework for learning quantum many-body systems from their thermal states
arXiv quant-ph
arXiv:2610.01074v1 Announce Type: new Abstract: The task of learning the Hamiltonian interactions governing a quantum system, given samples of its thermal (or 'Gibbs') states, is a foundational question at the intersection of quantum…
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Function-like pseudorandom unitaries generate pseudorandom quantum processes
arXiv quant-ph
arXiv:2610.01038v1 Announce Type: new Abstract: Haar-random unitaries provide a canonical model of generic random quantum evolution, but they typically have exponential description and circuit complexity. Although pseudorandom unitaries…
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Classical Hardness of Learning Functions of Hamiltonians
arXiv quant-ph
arXiv:2610.01141v1 Announce Type: new Abstract: Morohoshi, Nakayama, Manabe, and Mitarai proposed a physically motivated quantum machine learning problem in which the goal is to predict quantities of the form $\operatorname{Tr}[f(H)\rho]$…
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Robustness hierarchy of bipartite quantum correlations under noisy dynamics
arXiv quant-ph
arXiv:2610.01163v1 Announce Type: new Abstract: Quantum correlations are fragile under noise, motivating quantitative measures that track not only their presence but also their degradation during physical evolution. We develop a robustness…
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Rapid mixing of quantum spin chains at any finite temperature
arXiv quant-ph
arXiv:2610.01190v1 Announce Type: new Abstract: We prove that a quasi-local quantum Gibbs sampler rapidly mixes to the Gibbs state of any 1D finite-range Hamiltonian at all finite temperatures in $\mathcal{O}\left(\log…
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Vector chiral order and dynamical quantum phase transitions in an Ising chain with dimerized anisotropic Gamma interaction
arXiv quant-ph
arXiv:2610.01167v1 Announce Type: new Abstract: We investigate a transverse-field Ising chain with dimerized anisotropic Gamma interactions and demonstrate that, both in the absence and presence of Ising interactions, the competition…
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Experimental quantification of quantum coherence for a set of quantum states
arXiv quant-ph
arXiv:2610.01227v1 Announce Type: new Abstract: We present a direct experimental verification of quantum coherence for a set of quantum states in a basis-independent manner. We find that the theory of quantum coherence for a set of quantum…
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Linear-Time Encodable Quantum Codes near the CSS GV Bound
arXiv quant-ph
arXiv:2610.01277v1 Announce Type: new Abstract: We construct quantum CSS codes with rate-distance tradeoff approaching the CSS GV bound, which can be encoded by a quantum circuit of logarithmic depth and a linear number of gates. Our…
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Preservability of Measurement Incompatibility: Purification, Activation, and a No-Go Theorem
arXiv quant-ph
arXiv:2610.01327v1 Announce Type: new Abstract: Measurement incompatibility is a fundamental quantum resource that enables advantages in many quantum information tasks, including cryptography and communication. However, unavoidable…
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Efficient certification of time-reversal symmetry requires entanglement
arXiv quant-ph
arXiv:2610.01555v1 Announce Type: new Abstract: Time-reversal symmetry is a fundamental principle of physics describing the invariance of physical laws under reversal of the direction of time. We formulate a Bell-inequality-like test of…
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QUFIG: GNN-Based Prediction of Quantum Fault Injection Vulnerabilities with Gate-Level Precision
arXiv quant-ph
arXiv:2610.01777v1 Announce Type: new Abstract: The growing scale and accessibility of quantum hardware exposed new reliability and security challenges in the quantum computing workflow, such as the run-time fault injection attacks in…
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Non-Markovian effects on informational steady states
arXiv quant-ph
arXiv:2610.01782v1 Announce Type: new Abstract: Informational steady states (ISSs) arise when the rate at which information is gained from continuous measurements is exactly balanced by the rate at which information from earlier…
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Learnt Attacks on Quantum Key Distribution under Channel Noise and Device Drift
arXiv quant-ph
arXiv:2610.01792v1 Announce Type: new Abstract: Quantum key distribution (QKD) links are provisioned from security analyses of stationary channels, whereas the devices that determine the channel drift between recalibrations. Whether an…
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Efficient quantum phase estimation with adaptive entanglement-assisted Hadamard test
arXiv quant-ph
arXiv:2610.01772v1 Announce Type: new Abstract: The entanglement-assisted Hadamard test (EHT) is a practical method for estimating a quantum phase by amplifying the phase signal. However, the feasible amplification is fundamentally limited…
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Collision models: Markovian and Non-Markovian impurity models
arXiv quant-ph
arXiv:2610.01814v1 Announce Type: new Abstract: Collision models provide a flexible framework for studying open quantum systems and introducing non-Markovianity. We present a novel class of collision models, which we term Markovian…
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Toward Optimal Circuit Depth for Geometrically Local Hamiltonian Simulation
arXiv quant-ph
arXiv:2610.01839v1 Announce Type: new Abstract: Understanding the dynamics of interacting quantum systems is a central goal of quantum simulation. For geometrically local Hamiltonians, locality suggests that digital simulation should…
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Trapdoored Clifford Operators and Applications
arXiv quant-ph
arXiv:2610.01848v1 Announce Type: new Abstract: Random Clifford operators have numerous applications in quantum computing, including randomized benchmarking, classical shadows, and quantum authentication. However, sampling and implementing…
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Quantum Optimal Transport Barycenters: Existence, Duality, and Gaussian Rigidity
arXiv quant-ph
arXiv:2610.01855v1 Announce Type: new Abstract: We develop a Quantum Optimal Transport (QOT) barycenter framework for quantum states, as an analog of Wasserstein barycenters~\cite{AguCar}, and establish existence and duality results for a…
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Experimental realization of Wheeler's delayed-choice experiment with dual selections
arXiv quant-ph
arXiv:2610.01832v1 Announce Type: new Abstract: Wheeler's delayed-choice experiment demonstrates wave-particle duality of particles using different experimental configurations of a Mach-Zehnder interferometer. In a quantum version of this…
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Floquet-Universal Hamiltonian Simulation
arXiv quant-ph
arXiv:2610.01878v1 Announce Type: new Abstract: Analogue and digital Hamiltonian simulation represent two distinct approaches to making one quantum system replicate the physical properties of another, with consequences ranging from…
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Exponential quantum advantages for decoded quantum interferometry in the streaming setting
arXiv quant-ph
arXiv:2610.01902v1 Announce Type: new Abstract: Decoded quantum interferometry (DQI) is a polynomial-time quantum algorithm introduced by Jordan et al. (Nature 2025). For a natural optimization problem, known as optimal polynomial…
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Fourier Symmetrization for Geometric Quantum Machine Learning
arXiv quant-ph
arXiv:2610.01874v1 Announce Type: new Abstract: Geometric quantum machine learning incorporates symmetry into quantum models, but how symmetry shapes their expressivity and guides effective model design remains insufficiently understood…
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Optimal query complexity for fractional quantum evolution
arXiv quant-ph
arXiv:2610.01940v1 Announce Type: new Abstract: Given oracle access to an unknown unitary $U=e^{iH}$ , the fractional query problem asks how many queries are required to implement a noninteger power $U^t=e^{itH}$, $0
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One-Way Quantum Symmetric Private Information Retrieval Protocol From A Single Database Server Using NISQ Devices
arXiv quant-ph
arXiv:2610.02093v1 Announce Type: new Abstract: Symmetric private information retrieval (SPIR) lets an inquirer obtain one specific bit only, without leaking any information about its index to the database owner. With a single server, this…
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Quantum state preparation for weighted d-DNNF
arXiv quant-ph
arXiv:2610.02094v1 Announce Type: new Abstract: The quantum state preparation problem is to, given a description of a quantum state, efficiently generate a quantum circuit computing the state. We show that for quantum states described by…
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Stationarity as a One-Mode Constraint on Quantum Correlation
arXiv quant-ph
arXiv:2610.02090v1 Announce Type: new Abstract: A stationary quantum state has one dynamical phase factor and one scalar energy even when its internal response spans a large Hilbert space. Our argument concerns not the value or…
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A No-Go Theorem for Order-Two Clifford Electric-Magnetic Duality
arXiv quant-ph
arXiv:2610.02097v1 Announce Type: new Abstract: Electromagnetic duality in the toric code has order two at the level of anyon types and acts as a Hadamard-type logical transformation on the encoded quantum information. Here, we ask whether…
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An exponential separation between entanglement-assisted and unassisted one-way quantum communication
arXiv quant-ph
arXiv:2610.02099v1 Announce Type: new Abstract: A longstanding question in quantum communication complexity is whether some task can be accomplished with a small amount of communication in the presence of entanglement, yet require much…
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Unitary Schur Sampling of Qudits via Random SWAP Tests: Hunt for Antisymmetry
arXiv quant-ph
arXiv:2610.02103v1 Announce Type: new Abstract: Schur sampling is a fundamental primitive for extracting permutation-invariant information from many-body quantum systems and has broad applications in quantum information science…
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A Generalized quantum Stein lemma on von Neumann algebras
arXiv quant-ph
arXiv:2610.02134v1 Announce Type: new Abstract: We prove a generalized quantum Stein lemma for i.i.d. normal states against convex, tensor-stable families on arbitrary von Neumann algebras. Assuming the existence of an alternative state…
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One-Shot any Code
arXiv quant-ph
arXiv:2610.02137v1 Announce Type: new Abstract: We first provide a simple proof showing that any single-shot code is self-correcting. We then show that any $[[n,k]]$ CSS quantum low-density parity-check (QLDPC) code can be transformed into…
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Polynomial-time additive-error estimation of output probabilities for shallow quantum circuits
arXiv quant-ph
arXiv:2610.02146v1 Announce Type: new Abstract: We give a deterministic classical algorithm that estimates $|\langle x|U|0^n\rangle|^2$ to additive error $\varepsilon$ in $\mathrm{poly}(n, 1/\varepsilon)$ time, where $U$ is a…
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The Robustness of QAC0
arXiv quant-ph
arXiv:2610.02154v1 Announce Type: new Abstract: In this work we study the robustness of $\mathsf{QAC}^0$ with respect to error tolerance and modifications to its gate-set. First, we investigate whether the non-zero error typically allowed…
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A Hilbert-Space Analogy for Sexual Orientation and Gender Identity
arXiv quant-ph
arXiv:2610.00646v1 Announce Type: cross Abstract: We introduce a finite-dimensional state-space representation of bisexuality in Dirac notation, specify normalized amplitude weights, and analyze the limits of inference from one single…
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How Superradiance Survives Molecular Noise inside Virus Capsids
arXiv quant-ph
arXiv:2610.00739v1 Announce Type: cross Abstract: Excited organic dyes chemically bound to an icosahedral virus shell can spontaneously synchronize and emit a superradiant burst of light. The mechanism that allows it to occur at room…
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Thermal entanglement transitions from strong $\textrm{SU}(2)$ symmetry
arXiv quant-ph
arXiv:2610.00826v1 Announce Type: cross Abstract: We study mixed-state entanglement in Gibbs states with strong $\mathrm{SU}(2)$ symmetry, focusing on locally interacting spin systems with ferromagnetic interactions. Our main result is to…
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Correlation Imaging via Hybrid Entanglement between Microwave Photons and Surface Acoustic Wave Phonons
arXiv quant-ph
arXiv:2610.01252v1 Announce Type: cross Abstract: Establishing effective spatial correlations between distinct quantum fields is essential for multi-physics quantum sensing.~We here propose a correlation imaging approach based on the…
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Limits to black-box amplification in QMA
arXiv quant-ph
arXiv:2509.21131v4 Announce Type: replace Abstract: We study the limitations of black-box amplification in the quantum complexity class QMA. Amplification is known to boost any inverse-polynomial gap between completeness and soundness to…
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Quantum Hamiltonian-Based Generative Modeling of Single-Cell Transcriptomics for Gene Regulatory Network Inference
arXiv quant-ph
arXiv:2602.19496v2 Announce Type: replace Abstract: We introduce a novel quantum Hamiltonian-based gene expression model (QHGM), a generative framework for modeling pseudotime-ordered single-cell gene expression data. In QHGM, gene…
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Predicting properties of quantum thermal states from a single trajectory
arXiv quant-ph
arXiv:2602.12539v2 Announce Type: replace Abstract: Estimating thermal expectation values of observables is a fundamental task in quantum physics, quantum chemistry, and materials science. While recent quantum algorithms have enabled…
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Achieving Sub-Zeptonewton Force Sensitivity and Spin-Motion Entanglement in Levitated Diamond via Pulsed Backaction Evasion
arXiv quant-ph
arXiv:2603.16487v3 Announce Type: replace Abstract: We propose a system to achieve sub-zeptonewton force sensing and robust spin-mechanical entanglement in a levitated diamond system. By coupling a nitrogen-vacancy (NV) center spin to the…
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Quantum dynamics of few-photon pulsed waveguide-QED with a single artificial atom: frequency-dependent scattering theory and time-dependent matrix product states
arXiv quant-ph
arXiv:2603.16628v2 Announce Type: replace Abstract: We present a quantum dynamical study of pulsed few-photon scattering from a single artificial atom, consisting of a two-level system (TLS) or qubit, in a waveguide QED system, directly…
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Exponential quantum advantage in processing massive classical data
arXiv quant-ph
arXiv:2604.07639v2 Announce Type: replace Abstract: Broadly applicable quantum advantage, particularly in classical data processing and machine learning, has been a fundamental open problem. In this work, we prove that a small quantum…
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4D and 5D Layer Codes through Color Routing
arXiv quant-ph
arXiv:2605.18961v2 Announce Type: replace Abstract: We introduce and explicit Calderbank-Shor-Steane (CSS) code construction that generalizes the Layer codes to $D=4,5$ dimensions. Much like its predecessor, the present construction is…
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Symmetry-resolved parent Hamiltonians for entangled bosonic cat resources
arXiv quant-ph
arXiv:2607.02997v2 Announce Type: replace Abstract: Schr\"odinger cat states, formed from superpositions of well-separated coherent states, are promising resources for bosonic quantum information. We construct parent Hamiltonians for…
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Action on the Sphere: An Interfering Mean-Field Propagator for the Bose-Hubbard Dimer
arXiv quant-ph
arXiv:2606.30276v2 Announce Type: replace Abstract: The Bose-Hubbard system has been studied extensively both theoretically and experimentally, in particular in the context of ultracold atomic gases in optical lattices. Even in the…
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Communication Advantages from Quantum Dense Network Coding
arXiv quant-ph
arXiv:2607.08133v2 Announce Type: replace Abstract: A central problem in quantum information theory is understanding how quantum resources can be used to communicate information more efficiently than classical resources. We introduce…
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Improved convergence radius of the Fer expansion for Hermitian generators
arXiv quant-ph
arXiv:2609.28302v2 Announce Type: replace Abstract: The Dyson series expands the propagator of a time-dependent Hamiltonian in powers of the Hamiltonian, but its truncations are in general not unitary. The Fer expansion writes the same…
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Impossibility of One-Way One-Round Quantum 4-Coloring via Matrix-Space Stability
arXiv quant-ph
arXiv:2609.09091v2 Announce Type: replace Abstract: We show that one-way one-round quantum-LOCAL algorithms cannot $4$-color directed cycles with high probability. This is the first lower bound in the high-probability quantum LOCAL setting…
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Continuity of Regularized Channel R\'enyi Divergences
arXiv quant-ph
arXiv:2609.28635v2 Announce Type: replace Abstract: We prove that the regularized, stabilized sandwiched R\'enyi divergence of finite-dimensional quantum channels converges to their regularized relative entropy as the R\'enyi order tends…
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Metachecks in Bivariate Bicycle Codes: Syndrome Distance, Measurement Faults, and Repair Limits
arXiv quant-ph
arXiv:2609.39121v2 Announce Type: replace Abstract: Faulty syndrome measurements can corrupt an otherwise correct quantum-error correction step. Bivariate bicycle (BB) codes contain dependent stabilizer checks, so every valid syndrome…
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Quantum Circuit Pruning: From NISQ Architectures to Fault-Tolerant Operations
arXiv quant-ph
arXiv:2610.00669v1 Announce Type: new Abstract: We present a routing-aware pruning strategy for quantum circuits that selectively removes parametric two-qubit gates whose computational contribution is outweighed by the fidelity cost of…
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Conditioning on Subalgebras - Entropy Duality and Generalized Quantum Stein's Lemma in von Neumann Algebras
arXiv quant-ph
arXiv:2610.00772v1 Announce Type: new Abstract: We establish duality relations for conditional entropies relative to subalgebras of arbitrary von Neumann algebras, including the Umegaki relative entropy as well as the sandwiched- and…
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Improving Feasibility in Quantum Approximate Optimization Algorithm for Vehicle Routing via Constraint-Aware Initialization and Hybrid XY-X Mixing
arXiv quant-ph
arXiv:2604.07218v2 Announce Type: replace-cross Abstract: The Quantum Approximate Optimization Algorithm (QAOA) is a leading framework for quantum combinatorial optimization. The Vehicle Routing Problem (VRP), a core problem in logistics…
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Geometric characterization of non-Gaussian entanglement for finite stellar rank states
arXiv quant-ph
arXiv:2511.02076v2 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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On Quasiparticles within the Refined Gribov-Zwanziger Model
arXiv quant-ph
arXiv:2609.04423v2 Announce Type: replace-cross Abstract: The problem of the effective excitations of a gauge theory in the nonperturbative regime remains not completely understood. Using the Refined Gribov-Zwanziger (RGZ) theory as…
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Exact fermionic dual of the Bose-Hubbard model
arXiv quant-ph
arXiv:2609.07830v2 Announce Type: replace-cross Abstract: Recent developments have established exact bosonization and fermionization with a $\mathbb{Z}_2$ symmetry as dualities through gauging. In this work, we apply fermionic gauging…
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On the growth of operator entanglement in brickwork circuits with Yang--Baxter gates
arXiv quant-ph
arXiv:2609.05121v2 Announce Type: replace-cross Abstract: We study the operator entanglement of local operators in one-dimensional brickwork circuits whose two-site gate satisfies the braid relation; throughout this work, we call such a…
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Fidelity Estimation to a Known Quantum State Is Nearly Quadratic in the Smaller Rank
arXiv quant-ph
arXiv:2608.01770v2 Announce Type: replace Abstract: We study the number of copies needed to estimate the root Uhlmann fidelity between an unknown quantum state and a classically known reference, under collective measurements. If the…
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Tight Post-Quantum Parallel Repetition for Private-Coin Arguments
arXiv quant-ph
arXiv:2609.38941v2 Announce Type: replace Abstract: We show that assuming the existence of homomorphic encryption, parallel repetition of all interactive arguments (after being run under homomorphic encryption) reduces the soundness error…
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Beyond Feasibility: Finite-Depth Accessibility in Constrained QAOA
arXiv quant-ph
arXiv:2610.00736v1 Announce Type: new Abstract: Constraint-preserving mixers keep QAOA within a feasible subspace, but feasibility and global mixer connectivity do not determine which feasible configurations are available to a particular…
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Accelerating quantum Gibbs sampling without quantum walks
arXiv quant-ph
arXiv:2604.22996v2 Announce Type: replace Abstract: Szegedy's quantum walk quadratically accelerates reversible classical Markov chains, but extending this mechanism to efficiently implementable quantum Gibbs samplers has remained…
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Multivariate Quantum Signal Processing
arXiv quant-ph
arXiv:2610.01125v1 Announce Type: new Abstract: We develop Multivariate Quantum Signal Processing for designing matrix-valued transformations of multiple noncommuting nonnormal block-encoded matrices. Our framework equips quantum…
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Global and nonlocal magic of quantum many-body scars
arXiv quant-ph
arXiv:2610.00129v1 Announce Type: new Abstract: Nonergodic features of chaotic quantum many-body systems are commonly characterized through local observables, fidelity, and entanglement entropy. Here, using global and nonlocal measures of…
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Real-Time Adaptive Filtering and the Boxcar Limit in Superconducting Qubit Readout
arXiv quant-ph
arXiv:2610.00783v1 Announce Type: new Abstract: In dispersive readout of superconducting qubits, the common baseline is a boxcar averager: a uniformly weighted average over a fixed window followed by threshold-based state assignment. We…
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Remote state preparation of a single-spin state via hybrid spin-photon entanglement
arXiv quant-ph
arXiv:2610.00832v1 Announce Type: new Abstract: Remote state preparation is a fundamental quantum-information protocol that exploits prior knowledge of a target state to reduce the communication resources required for quantum-state…
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A Frame-Spread Lower Bound for Quantum Entropy Estimation under Fixed Rank-One Measurements
arXiv quant-ph
arXiv:2610.00270v1 Announce Type: new Abstract: We study estimation of the von Neumann entropy of a $d$-dimensional quantum state from independent outcomes of a fixed rank-one measurement. Let $\kappa_\nu\in[1,d+1]$ denote the normalized…
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Continuous-Process Randomized Compilation for Quantum Process Tensors
arXiv quant-ph
arXiv:2610.01521v1 Announce Type: new Abstract: Traditional discrete randomized compiling (RC) tailors errors with random control frames at logical-gate boundaries, but fails to capture intra-instrument control evolution or persistent…
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Avoiding Exponentially Large Groups with Open Quantum System Technology
arXiv quant-ph
arXiv:2610.01932v1 Announce Type: new Abstract: We propose a novel approach to state preparation by embracing the full power of open quantum systems. Instead of working with the whole unitary group in $n$ qubits, we identify a small Lie…
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Symmetry considerations in chirality-induced spin selectivity
arXiv quant-ph
arXiv:2610.01880v1 Announce Type: cross Abstract: The chirality-induced spin selectivity (CISS) effect, the coupling between structural chirality and electron spin polarization, has been experimentally observed across many diverse systems…
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Operational transformation rates of quantum states
arXiv quant-ph
arXiv:2610.02025v1 Announce Type: new Abstract: Typically, multiple copies of a quantum state are described by a tensor power of that state. However, from an operational point of view, an experimentalist cannot, in general, rule out…
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Additive solid immersion lenses for enhanced collection efficiency of shallow NV centers by pulsed laser deposition and structurization of high-k amorphous oxides
arXiv quant-ph
arXiv:2610.01183v1 Announce Type: cross Abstract: The negatively charged nitrogen-vacancy ($\mathrm{NV}^-$) defect in diamond can be used for quantum information processing via the readout of the radiative decay of the excited state into…
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Coherent Release Fronts in Krylov Chains and Thermal AdS$_2$ Response
arXiv quant-ph
arXiv:2610.01862v1 Announce Type: cross Abstract: We study coherent release from a finite serial Krylov sector into an exact conformal tail with asymptotically linear Lanczos coefficients. We derive an exact finite-cut occupation kernel…
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Superintegrability of a resonant ghostly tri-Hamiltonian model: polynomial first integrals and transcendental completion
arXiv quant-ph
arXiv:2610.01901v1 Announce Type: cross Abstract: We study classical and quantum superintegrability of a resonant three-dimensional Hamiltonian with indefinite kinetic energy and three Poisson descriptions of the same flow. Besides three…