Quantum Computing
Quantum Computing news — Monday 12 October 2026
131 stories from 3 sources, every one in English. Each links to its publisher.
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Podcast with Walter Raquet, Chairman and CEO of Symmatrics
Quantum Computing Report
Yuval Boger speaks with Walter Raquet, Chairman and CEO of Symmatrics, a company that has revived the one-time pad symmetric key encryption concept — once used exclusively by US intelligence agencies — and brought it to the internet age…
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WISeSat.Space Develops Post-Quantum Security for Satellite Communications
The Quantum Insider
Insider Brief WISeSat.Space is developing a satellite communications and IoT security architecture that integrates post-quantum cryptography (PQC), digital identity, and cryptographic key management across connected devices, ground…
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SEALSQ Unveils VaultIC409 Secure Element for Post-Quantum Cryptography
The Quantum Insider
Insider Brief SEALSQ has unveiled VaultIC409, a secure element built on its QS7001 platform to support post-quantum cryptography in connected devices without requiring customers to redesign their existing hardware security architecture…
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IonQ Demonstrates Scheduled qLDPC Error Correction to Accelerate Fault-Tolerant Gate Execution by up to 74x
Quantum Computing Report
IonQ researchers have developed a new hybrid physical/logical execution strategy for quantum error correction, significantly accelerating fault-tolerant quantum computing. This approach, detailed in a recent arXiv paper, utilizes scheduled…
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In Step Toward Quantum Networking, Penn Study Finds Quantum Light Pattern Can Survive Loss of Entanglement
The Quantum Insider
Insider Brief Penn-led researchers used a photonic chip to transfer a winding pattern from one photon to a shared two-photon state, preserving the pattern under noise even after entanglement disappeared. The winding pattern remained stable…
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IonQ to Acquire Elisity for Up to $1.3 Billion to Integrate Zero Trust with Post-Quantum Cybersecurity
Quantum Computing Report
IonQ is set to acquire Elisity for up to $1.3 billion in an all-stock deal, integrating Elisity's Zero Trust cybersecurity with IonQ's post-quantum cryptography. This acquisition, expected to close in Q4 2026, aims to enhance IonQ's…
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IonQ Agrees to Buy Elisity in Cybersecurity Deal Worth Up to $1.3 Billion
The Quantum Insider
Insider Brief IonQ has agreed to acquire cybersecurity company Elisity in an all-stock deal worth up to $1.3 billion, according to The Wall Street Journal. Elisity provides software designed to prevent attackers and ransomware from…
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Rensselaer Polytechnic Institute Names James Misewich Quantum Computing Constellation Chair
The Quantum Insider
Insider Brief Rensselaer Polytechnic Institute (RPI) has appointed James Misewich as the Curtis R. Priem Quantum Computing Constellation Chair, effective January 1, 2027. Misewich will help lead RPI’s quantum strategy, expand collaboration…
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Quantum Meet Quantum: Hybrid Quantum Computer Lets Scientists Peak in on Foundational Quantum Effect
The Quantum Insider
Insider Brief Oxford physicists used a hybrid quantum computer combining qubits and quantum oscillators to observe the Aharonov–Bohm effect in a simulation of interactions between matter and gauge fields. Encoding magnetic flux in…
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Diversity-Aware Ensemble of Quantum-Classical Models via Combinatorial Fusion
arXiv quant-ph
arXiv:2610.13808v1 Announce Type: new Abstract: Variational quantum circuits (VQCs) are highly sensitive to circuit architecture, yet most quantum machine learning pipelines select a single best design and discard the remaining candidates…
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An entangling Hubbard quasiparticle collider on a digital quantum processor
arXiv quant-ph
arXiv:2610.13946v1 Announce Type: new Abstract: Scattering of quasiparticles provides direct access to the interactions that govern strongly correlated systems. In this work, we realize the quasiparticle scattering experiment of the…
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Graphene double quantum dot as a solid-state two-level system in the THz range
arXiv quant-ph
arXiv:2610.13196v1 Announce Type: cross Abstract: Matter-based two-level quantum systems are fundamental building blocks of quantum technologies, underpinning applications in quantum computing, simulation, communication, and sensing…
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Quantum Approximate Optimization for Decoding of Low-Density Parity-Check Codes
arXiv quant-ph
arXiv:2602.21124v2 Announce Type: replace Abstract: Decoding Low-Density Parity-Check (LDPC) codes is a fundamental problem in coding theory, and Belief Propagation (BP) is one of the most popular methods for LDPC code decoding. However…
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An Instability of the Quantum Markov Length
arXiv quant-ph
arXiv:2610.12929v1 Announce Type: new Abstract: The Markov length, the length scale governing the exponential decay of conditional mutual information (CMI) in a quantum many-body state, has proven useful for characterizing mixed-state…
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Block encoding of semiseparable matrices via their generators
arXiv quant-ph
arXiv:2610.13228v1 Announce Type: new Abstract: We present an explicit quantum circuit that constructs a block encoding of a generator-representable semiseparable (one-pair) matrix directly from its two generators. For an $N\times N$…
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Warm-Start Quantum Computation for Energy Readout and State Preparation
arXiv quant-ph
arXiv:2610.12485v1 Announce Type: new Abstract: Estimating a ground-state energy and preparing a ground state both split into a front-end that supplies an approximate state $|\chi\rangle$ and a back-end that reads or refines it. We argue…
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Error correction and quantum information spreading on sparse random graphs
arXiv quant-ph
arXiv:2610.12597v1 Announce Type: new Abstract: Quantum error-correcting codes on graph geometries beyond regular euclidean lattices have emerged as a promising route toward robust quantum information processing. A major challenge in…
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Trainable Quantum-Native Language Models: Dissipative Memory, Capacity Limits, and Hardware Validation
arXiv quant-ph
arXiv:2610.12806v1 Announce Type: new Abstract: We study byte-level autoregressive language models whose hidden state is a small quantum register, whose transitions are learned token-conditioned quantum channels, and whose next-byte…
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Improved classical optimization of fermionic Hamiltonians beyond Gaussian states
arXiv quant-ph
arXiv:2610.12844v1 Announce Type: new Abstract: We give a polynomial-time randomized classical algorithm that approximates the largest eigenvalue $\lambda_{\max}$ of a traceless quartic fermionic Hamiltonian $H$ on $n$ modes. The algorithm…
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Circuit Design Problems in Binary Polynomial Quantum Optimization
arXiv quant-ph
arXiv:2610.13283v1 Announce Type: new Abstract: Solving combinatorial optimization problems on near-term quantum computers mainly relies on their quadratic unconstrained binary formulation. Lately, binary polynomial formulations start to…
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Wideband microwave resonator for NV center vector magnetometry
arXiv quant-ph
arXiv:2610.13379v1 Announce Type: new Abstract: The nitrogen-vacancy (NV) color center in diamond has found applications in magnetometry across various geometrical scales. In particular, vector magnetometry using hand-held devices with low…
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System-Design Optimization of a Single-Transmitter, Single-Fiber QKD-based ITS Communication Link
arXiv quant-ph
arXiv:2610.13359v1 Announce Type: new Abstract: Deploying QKD-based secure communication at scale requires reducing duplicated optical hardware while preserving the rate of protected user data. Earlier studies established the physical…
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Quantum extreme learning for forecasting experimental chaotic electronic circuits
arXiv quant-ph
arXiv:2610.13388v1 Announce Type: new Abstract: Quantum reservoir computing and its special case, quantum extreme learning, are powerful tools for predicting classical discrete time-series with quantum devices. Forecasting continuous…
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Construction of isoscattering non-isospectral quantum graphs using the concept of a germ graph
arXiv quant-ph
arXiv:2610.13512v1 Announce Type: new Abstract: The recently developed concept of germ graphs (P. Kurasov {\it et al.}, Phys. Rev. Research {\bf 7}, L022071 (2025)) is employed to construct families of isocattering, non-isospectral graphs…
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Finite-Size Limits of Adaptive Pauli Prediction
arXiv quant-ph
arXiv:2610.13652v1 Announce Type: new Abstract: Can quantum data reliably answer questions chosen from earlier results? We prove that $M$ adaptive Pauli predictions on $n$ qubits require $\Omega(\sqrt{\min\{n,M\}})$ copies at fixed…
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Dynamical Lie Algebras for Fixed-Gate Quantum Ans\"atze
arXiv quant-ph
arXiv:2610.13709v1 Announce Type: new Abstract: Parameterized Quantum Circuits have emerged as a central framework for variational quantum algorithms in the NISQ regime, with major applications in quantum simulation, combinatorial…
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Entanglement Catalysis Beyond the Asymptotic Rate
arXiv quant-ph
arXiv:2610.13602v1 Announce Type: new Abstract: Quantum entanglement is a fundamental resource in quantum information science, commonly consumed to perform tasks like quantum teleportation and quantum key distribution. Entanglement…
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No advantage from classical assistance for energy-constrained bosonic dephasing channels
arXiv quant-ph
arXiv:2610.13854v1 Announce Type: new Abstract: We prove that four capacities of single-mode bosonic dephasing channels coincide under an average photon-number constraint: the unassisted quantum capacity, the unassisted private capacity…
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An Annealing-based Quantum Neural Network with Discrete Wavelet Transforms for Enhanced Air Pollution Nowcasting
arXiv quant-ph
arXiv:2610.13882v1 Announce Type: new Abstract: Air pollution poses a significant threat to public health, exacerbated by the rapid industrialization and urbanization of modern society. While traditional deep learning offers predictive…
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Physics-inspired Generative AI models via real hardware-based noisy quantum diffusion
arXiv quant-ph
arXiv:2505.22193v2 Announce Type: replace Abstract: Quantum Diffusion Models (QDMs) are an emerging paradigm in Generative AI that aims to use quantum properties to improve the performances of their classical counterparts. However…
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Superconducting-antiqubit simulation enables optimal phase estimation via unitary inversion
arXiv quant-ph
arXiv:2506.04315v2 Announce Type: replace Abstract: A positron is equivalent to an electron traveling backward through time. Casting transmon superconducting qubits as akin to electrons, we simulate a positron with a transmon subject to…
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Classical and Quantum Heuristics for the Binary Paint Shop Problem
arXiv quant-ph
arXiv:2509.15294v3 Announce Type: replace Abstract: The Binary Paint Shop Problem (BPSP) is an $\mathsf{APX}$-hard optimisation problem arising in automotive manufacturing: given a sequence of $2n$ cars, comprising $n$ distinct models each…
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Equivariant Continuous Normalizing Flows with Offline Sampling for Fermionic Ground State Estimation
arXiv quant-ph
arXiv:2607.18486v2 Announce Type: replace Abstract: We introduce a framework for fermionic variational Monte Carlo in which a continuous normalizing flow refines a fixed antisymmetric base wavefunction. The flow is a…
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A lower bound on the overhead of addressable surgery on sparse stabiliser codes
arXiv quant-ph
arXiv:2610.11097v2 Announce Type: replace Abstract: We show that, for stabilisers codes, there always exists a logical subspace requiring $\tilde{\Omega}(k^2)$ ancillary qubits to be measured with a sparse surgery ancilla. For CSS codes…
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Neutrino Telescope Event Classification on Quantum Computers
arXiv quant-ph
arXiv:2506.16530v3 Announce Type: replace-cross Abstract: Quantum computers represent a new computational paradigm with steadily improving hardware capabilities. In this article, we present the first study exploring how current quantum…
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Breaking Memory Bottlenecks in Quantum Control Systems for More Precise Experiments and Higher Throughput Computing
arXiv quant-ph
arXiv:2608.06318v3 Announce Type: replace-cross Abstract: As quantum computing matures, there is an increasing need for deeper and longer experiments to characterize quantum devices precisely and higher circuit throughput to validate more…
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Finite Quantum Engineering Thermodynamics
arXiv quant-ph
arXiv:2610.13511v1 Announce Type: new Abstract: A useful thermodynamic model predicts what a device will do without tracking its full microscopic state. For a finite quantum working medium, the difficult question is which quantities should…
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Optimizing Entanglement Distribution Protocols: Maximizing Classical Information in Quantum Networks
arXiv quant-ph
arXiv:2603.25360v3 Announce Type: replace Abstract: Large-scale quantum networks depend on the efficient distribution of entangled pairs between distant nodes. However, state-of-the-art solutions rely on restrictive operational…
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Purcell-Engineered Hybrid Coupler for Leakage-Suppressed Robust CZ Gates
arXiv quant-ph
arXiv:2607.23463v3 Announce Type: replace Abstract: We propose a Purcell-engineered notch-filter hybrid coupler for superconducting controlled-$Z$ (CZ) gates that combines coherent interaction engineering with leakage-selective…
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Engineering Ergodicity-Breaking and Stable Emergent Conservation Laws in a Generic Quantum Many-body System Under Strong Periodic Drive
arXiv quant-ph
arXiv:2610.12551v1 Announce Type: new Abstract: A periodically driven quantum many-body system is believed to approach a locally infinite-temperature-like state as dictated by the ergodicity hypothesis, when all the couplings/parameters…
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Dissipative Majorana Chain---Anomalies and Non-Invertible Symmetries
arXiv quant-ph
arXiv:2610.12607v1 Announce Type: new Abstract: We study symmetries and anomalies of dissipative Majorana chains described by Lindblad dynamics. Using the operator-state mapping, we represent the Lindbladian as a non-Hermitian operator on…
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Latent Symmetry in Quantum Zeno Dynamics
arXiv quant-ph
arXiv:2610.12647v1 Announce Type: new Abstract: Quantum Zeno dynamics constrains a continuously monitored system to measurement-selected subspaces. Here we show that the structure of such Zeno subspaces can be governed by a \emph{latent…
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Error Mitigation by Zero-Noise Extrapolation (ZNE) in Indirect-Control System
arXiv quant-ph
arXiv:2610.13038v1 Announce Type: new Abstract: The indirect-control paradigm offers a scalable approach to quantum computation by restricting external operations to a small subset of qubits, whereas the entire system evolves under its…
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A robust digital receiver architecture for continuous-variable quantum key distribution
arXiv quant-ph
arXiv:2610.13090v1 Announce Type: new Abstract: Continuous-variable quantum key distribution utilizes advanced digital signal processing techniques to mitigate channel impairments, driving the progress of high-performance quantum secure…
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Temporal-Access Resource Theory for Continuous Process Tensors
arXiv quant-ph
arXiv:2610.13110v1 Announce Type: new Abstract: The uncontrolled endpoint channel can conceal how well a quantum process can protect a logical task under time-resolved control. We formulate a fixed-task resource theory of continuous…
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Modelling Josephson Junctions with Boundary Conditions: Towards High-Fidelity Models for Superconducting Qubits
arXiv quant-ph
arXiv:2610.13417v1 Announce Type: new Abstract: Josephson junctions are the central nonlinear element of superconducting qubits, yet their standard description is reached through a chain of approximations. We propose a purely…
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Decoder- and Noise-Aware Optimization Framework for Clifford-Deformed Quantum Error-Correcting Codes
arXiv quant-ph
arXiv:2610.13589v1 Announce Type: new Abstract: Practical fault-tolerant quantum computing requires qubit-efficient quantum error correction (QEC). Clifford deformations (CDs) modify the stabilizers of a QEC code to lower its logical error…
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A scalable sample-based quantum diagonalization solver for general Pauli-sum Hamiltonians
arXiv quant-ph
arXiv:2610.13907v1 Announce Type: new Abstract: A scalable ground-state solver to be used in sample-based quantum diagonalization (SQD) is presented. The solver is built on JAX API, and is intended to be run on GPU platforms and possibly…
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Noise Thresholds for Quantum Advantage in the Bernstein-Vazirani and Deutsch-Jozsa Algorithms
arXiv quant-ph
arXiv:2508.01884v3 Announce Type: replace Abstract: We analytically investigate the robustness of the Bernstein-Vazirani and Deutsch-Jozsa algorithms against single-qubit Pauli noise, of which bit-flip, phase-flip, and depolarizing noise…
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Quantum Information-Theoretic Analysis of Optical Fiber Sensing via Stimulated Brillouin Scattering
arXiv quant-ph
arXiv:2610.12980v1 Announce Type: new Abstract: Stimulated Brillouin scattering (SBS) is a powerful mechanism for distributed sensing in optical fibers, as the Brillouin response is highly sensitive to local material parameters. Assuming…
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Harmonic analysis and circuit approximation of Sobolev functions on quantum input spaces
arXiv quant-ph
arXiv:2610.13477v1 Announce Type: new Abstract: We derive approximation rates for Sobolev functions defined on the complex unit sphere and complex projective space, representing quantum states, and on the special and projective unitary…
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Fundamental limits for thermodynamic control with quantum feedback
arXiv quant-ph
arXiv:2503.09012v4 Announce Type: replace Abstract: The study of feedback control inspired by Maxwell's demon has yielded fundamental insights into the relationship between thermodynamics and information. However, its fully quantum…
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Verifiable Sampling for Delegated Generative Quantum Machine Learning
arXiv quant-ph
arXiv:2610.13211v1 Announce Type: new Abstract: Generative machine learning has shown remarkable results across a wide range of interdisciplinary tasks, motivating significant efforts toward Quantum Generative Models as a path to…
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Erasing Photon-Number Correlations through Hong-Ou-Mandel Interference
arXiv quant-ph
arXiv:2502.06570v3 Announce Type: replace Abstract: A parametric down-conversion source interfering on a beam splitter can be described as both a source of entangled N00N-states or a source of independent, and thus uncorrelated squeezers…
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Finite-Size Effects in Quantum Metrology at Strong Coupling: Microscopic vs Phenomenological Approaches
arXiv quant-ph
arXiv:2507.19994v3 Announce Type: replace Abstract: Equilibrium quantum metrology is often formulated under assumptions of weak system-bath coupling and thermodynamic limit scaling, which may not be valid for realistic finite-size (FS)…
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A General Method for Extending Isoscattering Non-Isospectral Quantum Graphs
arXiv quant-ph
arXiv:2610.13349v1 Announce Type: new Abstract: The present paper sets out a general method for extending the isoscattering, non-isospectral quantum graphs. The methodology is illustrated by considering two graphs, denoted by $\Gamma_1$…
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When Does Interference Help Learning? Kernel Geometry as a Pre-Experimental Test for Photonic Reservoir Computing
arXiv quant-ph
arXiv:2610.11360v2 Announce Type: replace Abstract: Multi-photon interference is the resource most native to photonic quantum machine learning, yet experiments on photonic reservoirs have reported advantages, null results, and train-only…
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GPU-Based Parallel BP Decoding for Quantum LDPC Memory
arXiv quant-ph
arXiv:2610.13879v1 Announce Type: new Abstract: Quantum low-density parity-check (qLDPC) decoding requires reliable corrections and low latency over long syndrome histories. We extend BP-SF, an oscillation-guided belief-propagation (BP)…
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Classification of bipartite observables II: NIP observables and the Todorcevic trichotomy
arXiv quant-ph
arXiv:2610.12908v1 Announce Type: new Abstract: A bipartite observable is stable when its idealized responses are continuous. We show that it is NIP exactly when they are of the first Baire class. They then form a Rosenthal compactum, and…
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Second quantization and compactness of induced Gaussian quantum Markov semigroups
arXiv quant-ph
arXiv:2610.13358v1 Announce Type: cross Abstract: We characterize compactness of the Hilbert-Schmidt semigroups induced by finite-mode Gaussian quantum Markov semigroups with a faithful normal invariant state. A unitary second-quantization…
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QTestBench: A Test Framework for Evaluating LLM-Generated Quantum Code
arXiv quant-ph
arXiv:2610.13811v1 Announce Type: cross Abstract: Large language models (LLMs) have shown strong results in classical code generation and are increasingly used to write the unit tests that safeguard that code. Whether they can do the same…
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Exponential entanglement advantage in sensing correlated noise
arXiv quant-ph
arXiv:2410.05878v2 Announce Type: replace Abstract: Correlated noise naturally arises in quantum systems due to, e.g., phase and amplitude fluctuations in global control or long-range correlations generated by a many-body sensing target…
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Adaptive Window Decoding based on Spatiotemporal Complementary Gap
arXiv quant-ph
arXiv:2605.14637v2 Announce Type: replace Abstract: Real-time decoding plays a crucial role in practical fault-tolerant quantum computing. Window decoding, in which the decoding problem is divided into windows, is a promising approach…
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Certified Bounds on the Measurement Cost of Molecular Hamiltonians
arXiv quant-ph
arXiv:2607.16866v2 Announce Type: replace Abstract: Quantum estimates of molecular energy require repeated state preparation and measurement. We bound the minimum repetition count for given measurements and processing rules from above with…
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DC Conductance of X-shaped Majorana Interferometer reveals Non-Abelian Anyon Statistics
arXiv quant-ph
arXiv:2607.24171v2 Announce Type: replace Abstract: We propose a four-terminal, X-shaped chiral Majorana interferometer with a central floating superconducting island, enabling the direct detection of the non-Abelian statistics of Ising…
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Correlated Pair Creation with Positive- and Negative-Frequency Oscillators in a Trapped-Ion Quantum Simulator
arXiv quant-ph
arXiv:2610.12579v1 Announce Type: new Abstract: Spin-dependent forces enable independent control over the effective frequencies of bosonic motional modes and their coupling strengths to spins in trapped-ion spin-boson quantum simulators…
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Proof of a Universal Speed Limit on Fast Scrambling in Quantum Systems
arXiv quant-ph
arXiv:2404.15403v2 Announce Type: replace Abstract: We prove that the time required for sustained information scrambling in any Hamiltonian quantum system is universally at least logarithmic in the entanglement entropy of scrambled states…
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Quantum-assisted rendezvous on hypercubes: a quantum Bernoulli noise approach
arXiv quant-ph
arXiv:2610.12949v1 Announce Type: new Abstract: We study quantum-assisted balanced rendezvous on the $d$-dimensional hypercube in a one-step two-agent quantum-walk framework, where the two agents move the same Hamming distance and meet at…
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Fast computational primitives for La-cross qLDPC codes
arXiv quant-ph
arXiv:2610.12685v1 Announce Type: new Abstract: Quantum LDPC codes promise to reduce the overhead of fault-tolerant quantum computation, but their practical use requires efficient logical gates, measurements, and access to non-Clifford…
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Holographic Krylov complexity in confining backgrounds: particle, string, and frames
arXiv quant-ph
arXiv:2610.13555v1 Announce Type: cross Abstract: We investigate holographic Krylov complexity in bottom-up holographic QCD models describing the confined phase, using the recently proposed correspondence between the growth rate of Krylov…
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Efficient Quantum Simulation of Linearized Vlasov--Poisson Dynamics Using Trotter and THRIFT Hamiltonian Simulation Methods
arXiv quant-ph
arXiv:2608.23127v2 Announce Type: replace Abstract: The Vlasov--Poisson system provides the fundamental kinetic description of plasma and plays a central role in understanding collective phenomena such as Landau damping and wave--particle…
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Achieving perfect completeness for one- and two-message quantum proof systems
arXiv quant-ph
arXiv:2609.15926v3 Announce Type: replace Abstract: While quantum interactive proof systems using at least three messages can achieve perfect completeness, as shown by Kitaev and Watrous (STOC 2000), whether perfect completeness is…
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Beyond QAOA: A Review of AI and Quantum Computing for Adaptive Combinatorial Optimization
arXiv quant-ph
arXiv:2610.11759v2 Announce Type: replace Abstract: Near-term quantum approaches to combinatorial optimization are limited by qubit counts, circuit fidelity, sampling cost, and the difficulty of encoding constraints, while machine learning…
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Anomalies of global symmetries on the lattice
arXiv quant-ph
arXiv:2507.21209v3 Announce Type: replace-cross Abstract: 't Hooft anomalies of global symmetries play a fundamental role in quantum many-body systems and quantum field theory (QFT). In this paper, we make a systematic analysis of lattice…
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Correlation-Based Measurement of Entanglement in Rank-2 Mixed States
arXiv quant-ph
arXiv:2610.13579v1 Announce Type: new Abstract: We study correlation-based entanglement evaluation in rank-2 mixed states of two- and multi-qubit systems. The relevant two-dimensional subspace is treated as a logical qubit embedded in the…
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Genuine multipartite nonlocality detection in graph states
arXiv quant-ph
arXiv:2610.13609v1 Announce Type: new Abstract: Experimental detection of multipartite Bell nonlocality faces many challenges. The increase in the size of the system demands a higher fidelity of state preparation, a higher detection…
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Lieb-Robinson bounds for irreversible dynamics via adaptive Dyson expansion
arXiv quant-ph
arXiv:2610.12731v1 Announce Type: cross Abstract: In this note, we study a broad class of time-dependent and irreversible dynamics for quantum spin systems in both finite and infinite volume. We develop a simple and flexible strategy for…
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Mixed eigenstates in spin-boson systems with one-photon and two-photon interactions
arXiv quant-ph
arXiv:2604.05037v2 Announce Type: replace Abstract: Spin-boson systems have attracted increasing attention as accessible experimental platforms and for their potential applications in designing quantum technologies. One characteristic of…
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Reinforcement Learning to Harness Approximation Errors for Long-Time Quantum Simulation
arXiv quant-ph
arXiv:2608.20139v3 Announce Type: replace Abstract: Accurate digital quantum simulation at long times is limited by the accumulation of errors inherent to approximate simulation. Here we introduce RL-Trotter, a reinforcement-learning…
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Benchmarking dynamical-structure-factor protocols in programmable neutral-atom geometries
arXiv quant-ph
arXiv:2609.07634v2 Announce Type: replace Abstract: The dynamical structure factor is a central observable in condensed-matter physics, providing direct insight into the excitation spectrum and dynamical response of quantum materials…
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Evolving Hybrid Quantum-Classical Architectures for Image Classification
arXiv quant-ph
arXiv:2610.03220v2 Announce Type: replace-cross Abstract: Hybrid quantum classical neural networks integrate parameterized quantum circuits (PQCs) with established deep learning architectures, but their performance depends strongly on the…
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TLS loss in superconducting resonators on epitaxial hBN thin films
arXiv quant-ph
arXiv:2610.12556v1 Announce Type: new Abstract: The integration of low-loss dielectrics into superconducting circuits is of importance to the functionality of quantum computers and sensors. In this work, we fabricate and measure niobium…
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Locality-Preparation Time Tradeoffs in Dissipative Quantum Systems
arXiv quant-ph
arXiv:2610.13784v1 Announce Type: new Abstract: Dissipative state preparation engineers quantum many-body states as steady states of an open-system dynamics. The spatial range of the required dissipation sets both the feasibility of analog…
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Encoding Matters: A Qubit-Efficient Reformulation for Quantum Resilient Routing
arXiv quant-ph
arXiv:2610.13621v1 Announce Type: new Abstract: Qubits are powerful computational resources because each additional qubit doubles the size of the accessible state space. This expressive power comes at a cost: adding qubits also increases…
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Enhanced analogue quantum computation with a logically-encoded XX gadget
arXiv quant-ph
arXiv:2610.13845v1 Announce Type: new Abstract: The introduction of two-body XX interactions has been shown to improve the performance of quantum annealing in solving certain combinatorial optimisation problems and would enable the…
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Quantum Fisher Information of Driven-Dissipative Systems from Keldysh Path Integrals
arXiv quant-ph
arXiv:2609.26462v2 Announce Type: replace Abstract: Driven-dissipative many-body quantum systems can be exploited in quantum enhanced sensing protocols. Here, non-classical correlations may allow one to reach a measurement precision that…
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Sharp State-Independent Uncertainty Relations for Multipartite systems
arXiv quant-ph
arXiv:2608.22656v2 Announce Type: replace Abstract: Uncertainty relations constrain the fluctuations of incompatible observables, but most familiar bounds depend on the quantum state. State-independent uncertainty relations instead ask how…
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Exact polariton-condensate states via nonlinear Stark coupling
arXiv quant-ph
arXiv:2610.11234v2 Announce Type: replace Abstract: We study a hybrid system of coupled cavities, with or without two-level atoms doped inside. By employing a building-block construction facilitated by nonlinear Stark coupling, we identify…
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Analog quantum simulation of Shastry-Sutherland Ising materials
arXiv quant-ph
arXiv:2610.12800v1 Announce Type: new Abstract: Frustrated magnets host rich emergent behavior because competing interactions generate dense manifolds of low-energy states. The Ising Shastry-Sutherland model is a paradigmatic setting…
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An elementary approach to the Szeg\H{o} theorems
arXiv quant-ph
arXiv:2610.12724v1 Announce Type: cross Abstract: The strong Szeg\H{o} theorem and the Fisher-Hartwig formula describe the asymptotic behavior of determinants obtained by restricting translationally invariant operators to large finite…
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High-throughput bidirectional electro-optic transduction assessed with a practical quantum capacity
arXiv quant-ph
arXiv:2507.09873v4 Announce Type: replace Abstract: A microwave-optical transducer of sufficiently low noise and high signal transfer rate would allow entanglement to be distributed between superconducting quantum processors reliably…
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Multi-flux Aharonov-Bohm caging with tunable couplings
arXiv quant-ph
arXiv:2605.23546v2 Announce Type: replace Abstract: Aharonov-Bohm (AB) caging is the complete wavefunction localization effect in translational-invariant lattices induced by destructive phase interference. These phases originate from the…
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Lie Algebra-Based Quantum Optimal Controls Interpolation
arXiv quant-ph
arXiv:2606.02014v2 Announce Type: replace Abstract: We present a framework combining Lie group theory and feed-forward neural networks to efficiently generate quantum optimal control pulses for arbitrary unitary operations in…
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2 Fast 2 Surgery: Fast surgery on QLDPC codes with $\tilde{O}(n(k + d))$ space overhead
arXiv quant-ph
arXiv:2610.11079v2 Announce Type: replace Abstract: We show that the fast surgery framework of Baspin-Berent-Cohen can be instantiated using at most $\tilde{O}(n(k + d))$ ancilla qubits, improving on the previously achievable $O(n\cdot k…
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Pulsed control of an entanglement-breaking index: thermal valleys, a certified valve, and its open-close asymmetry
arXiv quant-ph
arXiv:2610.13135v1 Announce Type: new Abstract: The entanglement-breaking index of a channel is the number of self-compositions after which all entanglement with a reference system is destroyed. In a thermal qubit collision loop whose…
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Maximally antiflat fixed-particle-number fermionic states
arXiv quant-ph
arXiv:2610.13903v1 Announce Type: new Abstract: Fermionic Gaussian states are completely characterized by their two-point correlations, making the covariance matrix a natural reference for quantifying non-Gaussian structure. Motivated by…
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Distinguishing Flat and Warped Extra Dimensions with Unruh-DeWitt Detectors
arXiv quant-ph
arXiv:2610.13016v1 Announce Type: cross Abstract: We examine the response of a two level Unruh-DeWitt (UD) detector interacting with the Kaluza-Klein (KK) mass modes of a bulk scalar field in extra dimensional models. Considering two of…
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Exact Temporal Criticalities of Entanglement and Negativity in Gaussian and Non-Gaussian Dissipative Kitaev Chains
arXiv quant-ph
arXiv:2610.03889v2 Announce Type: replace Abstract: When the two largest eigenvalues of an entanglement or negativity spectrum meet, the gap of the corresponding entanglement or negativity Hamiltonian closes while entropies stay smooth, an…
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Determinism and Indeterminism as Model Artefacts: Toward a Model-Invariant Ontology of Physics
arXiv quant-ph
arXiv:2512.22540v4 Announce Type: replace-cross Abstract: This paper argues that, where deterministic and indeterministic formulations agree on empirically corroborated structure while differing in their completion of structure that…
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Coset Lifted Product Codes: Constructing Quantum LDPC Codes from Non-Normal Subgroup Actions
arXiv quant-ph
arXiv:2610.12782v1 Announce Type: new Abstract: We introduce coset lifted product (CLP) codes, a family of quantum LDPC codes that combine the protograph structure of lifted product codes with the coset action of Aydin, Tamo, and Barg…
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Operator dynamics in k-Markov random circuits
arXiv quant-ph
arXiv:2603.18217v2 Announce Type: replace Abstract: We demonstrate that $k$-Markov sequences of unitary gates provide low-cost handles to manipulate the rate and structure of information spreading compared to traditional random, 0-Markov…
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Zak Phase Quantization without Global Symmetry through Destructive Interference
arXiv quant-ph
arXiv:2610.13250v1 Announce Type: new Abstract: The Zak phase provides a fundamental geometric characterization of one-dimensional band structures and, when quantized by symmetry, serves as a bulk indicator of polarization and boundary…
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Beyond Orbital Rotations: Correlation-Rank Limits and Clifford-Accessible Measurement, from Algebra and Global Optimization
arXiv quant-ph
arXiv:2607.16869v2 Announce Type: replace Abstract: One should not assume that reconstructing an electronic observable with a smaller set of measurement settings will cut the number of repetitions in proportion. Each setting is simply a…
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Operational signatures of exceptional quantum channels
arXiv quant-ph
arXiv:2610.13622v1 Announce Type: new Abstract: Exceptional points (EPs) are usually introduced as defective degeneracies of non-Hermitian Hamiltonians and, in fully open quantum dynamics, of Liouvillian generators. Here we formulate an…
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Judd-Ofelt analysis and coherent spectroscopy of europium-based molecular complexes for quantum information applications
arXiv quant-ph
arXiv:2610.13664v1 Announce Type: new Abstract: Rare-earth-ion based molecular crystals are emerging as a promising platform for quantum information applications, combining long optical coherence times with the chemical tunability of…
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Evolution and breakdown of chiral anomaly in Weyl semiconductor tellurium
arXiv quant-ph
arXiv:2610.13084v1 Announce Type: cross Abstract: Chiral anomaly in topological materials manifests as negative longitudinal magnetoresistance, yet the tunability and evolution of this effect remain elusive. Here we show that doped…
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Percolation of Data Constraints and Reorganization of Boolean Function States in Parity Learning
arXiv quant-ph
arXiv:2610.13233v1 Announce Type: new Abstract: We study how a neural network reorganizes its learned function as training proceeds and as previously unseen parity data accumulate. The trained model is itself a Boolean function on binary…
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Scalable and telecom single-erbium system with record-long room-temperature quantum coherence
arXiv quant-ph
arXiv:2601.11879v3 Announce Type: replace Abstract: Achieving long-lived ({\mu}s-scale) quantum coherence at room temperature in the telecom C band remains a central unsolved challenge for solid-state quantum platforms, with coherence at…
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Quantum Query Complexity of Maximum Degree and its Generalizations
arXiv quant-ph
arXiv:2610.13906v1 Announce Type: new Abstract: We study the quantum query complexity of several basic graph problems. 1) We prove a tight $\Theta(n^{3/2})$ bound for finding a maximum-out-degree vertex in an $n$-vertex tournament…
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A Catalytic Algorithm for Transposing Unknown Qutrit Unitaries with Tight Query Bounds
arXiv quant-ph
arXiv:2610.12664v1 Announce Type: new Abstract: We construct exact deterministic circuits for transposing and inverting an unknown qutrit unitary $U\in\mathrm{SU}(3)$ using only forward queries. Three queries prepare a catalyst…
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Replica Transition at Measurement-Altered Ising Criticality
arXiv quant-ph
arXiv:2610.13802v1 Announce Type: cross Abstract: Performing measurements on gapless quantum ground states can give rise to new universal phenomena, whose origins remain poorly understood even for the paradigmatic Ising critical point…
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Borns Rule from Reversible Evolution and Irreversible Outcomes
arXiv quant-ph
arXiv:2604.07418v2 Announce Type: replace Abstract: We show that the quadratic measure associated with the Born rule need not be introduced as an independent probabilistic postulate, but follows, under the stated structural and regularity…
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A Warped Born Rule Turns an Observer into a Maxwell's Demon
arXiv quant-ph
arXiv:2610.13936v1 Announce Type: new Abstract: Quantum mechanics seems to be an incredibly delicate theory. Slight alterations to nearly any part of its structure can lead to huge qualitative differences and wildly unphysical predictions…
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Exchange-controlled quantum beats and entanglement in an exciton--bimodal-cavity system
arXiv quant-ph
arXiv:2610.04111v1 Announce Type: cross Abstract: We theoretically demonstrate tunable population transfer and entanglement generation in a two-exciton system coupled to a bimodal optical cavity, including an exciton-exciton exchange…
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Entanglement thresholds for sequential nonlocality sharing in star networks
arXiv quant-ph
arXiv:2512.13357v2 Announce Type: replace Abstract: Quantum networks promise scalable distributed quantum information processing. Realizing this potential depends critically on the efficient use of nonclassical resources. Sequential…
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Optimal linear-optical interferometers for unitary t-designs in a multi-photon Fock space
arXiv quant-ph
arXiv:2610.12646v1 Announce Type: new Abstract: We investigate the construction of unitary $t$-designs in a multi-photon Fock space on programmable linear-optical interferometers. Using the frame potential as the optimization objective, we…
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A Hardware-Native Trapped-Ion Hybrid Qudit-Oscillator Instruction Set
arXiv quant-ph
arXiv:2610.13843v1 Announce Type: new Abstract: Scaling trapped-ion processors by adding ions remains challenging. A complementary route exploits the multilevel internal structure of each ion to increase the computational Hilbert space per…
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Hamiltonian locality testing and certification do not achieve the Heisenberg limit
arXiv quant-ph
arXiv:2610.03205v2 Announce Type: replace Abstract: We establish lower bounds for Hamiltonian property testing with access to the time-evolution operator but not its inverse. Each experiment may query the time-evolution operator multiple…
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Quantum Topological Data Analysis Beyond Betti Numbers: Complexity Hardness $\＆$ An Algorithm for Torsion Witness
arXiv quant-ph
arXiv:2609.28112v2 Announce Type: replace Abstract: Recent advances have revealed an interplay between quantum computing and topological data analysis (TDA). Most quantum TDA has focused on Betti numbers, which characterize the…
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Bicycle Race: small two-block codes on the Pareto frontier
arXiv quant-ph
arXiv:2610.13880v1 Announce Type: new Abstract: Two-block group-algebra codes are among the simplest quantum LDPC codes, and many of them are translation invariant on a twisted torus, which suits neutral-atom arrays and other platforms…
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Exact solutions of non-Markovian dissipative Ising models
arXiv quant-ph
arXiv:2610.12546v1 Announce Type: new Abstract: Applications of quantum devices and simulators require an accurate understanding of their dynamics as well as the effects of environmental noise. While some sources of noise can be modeled as…
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When irrelevance governs: dissipation-regression scaling in open quantum criticality
arXiv quant-ph
arXiv:2610.13033v1 Announce Type: new Abstract: The real-time dynamics of quantum phase transitions in open systems coupled to finite-temperature environments sits at the heart of contemporary condensed-matter and quantum-information…
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Quantum non-Markovian response spectra
arXiv quant-ph
arXiv:2610.10684v2 Announce Type: replace Abstract: Quantum systems are rarely isolated from their surroundings. These hidden environments can retain information and return it later, producing correlated errors in quantum computers and…
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Frustrated Topological Orbital Magnetism
arXiv quant-ph
arXiv:2610.12557v1 Announce Type: cross Abstract: By studying the interplay of geometric frustration with Aharonov-Bohm fluxes in three dimensions, we unveil a rich playground exhibiting topological semimetallic ground states with orbital…
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On the Limits of Quantum Multiparty Simultaneous Communication
arXiv quant-ph
arXiv:2609.10289v2 Announce Type: replace-cross Abstract: We study the relative power of public randomness and quantum communication in the multiparty Simultaneous Message Passing (SMP) model. By analyzing a total Boolean function and a…
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Quantum-Circuit Residuals for Receptor Functional Potency Prediction: Predictive Gains and Quadratic Structure
arXiv quant-ph
arXiv:2610.13037v1 Announce Type: new Abstract: The predictive performance of neural networks for receptor functional potency modeling depends on both molecular representations and prediction-head design. Using GLP-1R cAMP-related pEC50…
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All-optical deconvolution via quantum cross-correlation spectroscopy with bright twin beams
arXiv quant-ph
arXiv:2610.13074v1 Announce Type: new Abstract: The resolution of spectroscopic measurements is fundamentally limited by the convolution between a system's intrinsic response and the instrument response function, creating an ill-posed…
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Theory of exciton-exciton interactions in crystalline systems
arXiv quant-ph
arXiv:2610.13246v1 Announce Type: cross Abstract: Excitons are bound electron-hole pairs in semiconductors whose interactions influence optical properties and determine their collective behavior and emergent correlated phases. Despite the…
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Real Fiducial Vectors Only Exist in Dimensions $d\equiv 3 \pmod{4}$
arXiv quant-ph
arXiv:2610.13168v1 Announce Type: cross Abstract: We investigate restrictions on the dimensions and coordinate fields of real Weyl-Heisenberg fiducial vectors. Our main result is that such vectors can exist only in dimensions $d\equiv…
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Continuous-wave AC magnetometry up to hundreds of megahertz using nitrogen-vacancy centers under a strong transverse magnetic field
arXiv quant-ph
arXiv:2610.13153v1 Announce Type: new Abstract: Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors for AC magnetic fields. However, conventional dynamical-decoupling-based magnetometry becomes technically demanding at…
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QTN-RQNN: Quantum Tensor Network-Based Recurrent Quantum Neural Network
arXiv quant-ph
arXiv:2610.13694v1 Announce Type: new Abstract: Resource constraints and imperfect quantum operations remain major challenges for quantum machine learning (QML) on noisy intermediate-scale quantum (NISQ) devices, particularly for…