Quantum Computing
Quantum Computing news — Monday 26 October 2026
113 stories from 1 sources, every one in English. Each links to its publisher.
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LYNX - A trapped-ion quantum information processor
arXiv quant-ph
arXiv:2610.32518v1 Announce Type: new Abstract: We introduce LYNX, a quantum information processor based on trapped $^{40}$Ca$^+$ ions. It utilizes up to 31 qubits with all-to-all connectivity. We characterize the system performance using…
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Constructing Large and Structured Decoherence-Free Subspaces in Hybrid Quantum Systems
arXiv quant-ph
arXiv:2610.12348v2 Announce Type: replace-cross Abstract: We develop a framework to construct large decoherence-free subspaces with a nontrivial structure. The construction is based on hybrid quantum systems in which quantum matter is…
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MERA: A Mid-Circuit-Measurement Error-Aware Compilation Framework for Quantum Circuits
arXiv quant-ph
arXiv:2511.10921v2 Announce Type: replace Abstract: Mid-circuit measurement (MCM) enables qubit reuse and dynamic control in quantum processors, underpinning resource-efficient algorithms and quantum error correction. However, MCM…
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SILMARILS-MV: Information-Theoretically Secure Multi-Verifier Signatures with Dealer-Free Key Issuance and Linear Aggregation for Permissioned Blockchains
arXiv quant-ph
arXiv:2610.31814v1 Announce Type: cross Abstract: Permissioned blockchains authenticate transactions, votes and quorum certificates with computationally secure signatures, and post-quantum replacements inflate consensus traffic by orders…
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Photoelectrons resolve the phase-dependent variance of bright squeezed vacuum
arXiv quant-ph
arXiv:2610.31811v1 Announce Type: cross Abstract: The variance of bright squeezed vacuum (BSV) is not only strong but also phase dependent, yet recent strong-field experiments with BSV have recorded only its magnitude. A coherent field of…
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Quantum Secret Sharing from CSS qLDPC Codes: Computable Access Structures, Accessible Logical Dimension, and Topology-Aware Network Cost
arXiv quant-ph
arXiv:2610.32428v1 Announce Type: new Abstract: Quantum secret sharing (QSS) schemes can be constructed from quantum error-correcting codes, but characterizing their access structures and implementation costs becomes challenging for…
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One-sided-DIQKD using any pure bipartite entangled state secure against all attacks
arXiv quant-ph
arXiv:2610.32923v1 Announce Type: new Abstract: Quantum Key Distribution (QKD) allows spatially separated parties to establish a secret key among themselves based on quantum principles. While QKD systems are being deployed worldwide, their…
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Maximal Orbital Entanglement from Non-Interacting Fermions
arXiv quant-ph
arXiv:2610.32974v1 Announce Type: new Abstract: Orbital rotations are used in quantum many-body physics and chemistry to reduce the complexity of quantum states by compressing their correlation into a small set of relevant orbitals. In…
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Quantum Spectral Estimation with Multiple Initial States: Improved Error and Cost Scaling
arXiv quant-ph
arXiv:2610.20482v2 Announce Type: replace Abstract: We study quantum spectrum and eigenstate property estimation using multiple initial states and generalized Hadamard tests. Building on the QFAMES (quantum filtering and analysis of…
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Real-space construction and selection rules of center-of-mass momentum eigenstates in two-dimensional many-body lattices
arXiv quant-ph
arXiv:2610.32054v1 Announce Type: new Abstract: We present a comprehensive framework for the real-space construction of center-of-mass (c.m.) momentum eigenstates in two-dimensional (2D) quantum many-body systems. Unlike standard…
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ArcTN: Efficient Tensor-Network Contraction Planning for Quantum Circuit Simulation
arXiv quant-ph
arXiv:2610.31554v2 Announce Type: replace Abstract: Tensor-network simulation of quantum circuits depends on contraction orders with low computational cost and small intermediate tensors, found without excessive planning time. We present…
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QuantumMatterExplorer: An Autonomous Agent for the Discovery of Quantum Many-Body Phases of Matter
arXiv quant-ph
arXiv:2610.32001v1 Announce Type: new Abstract: Mapping the phase diagram of a new quantum Hamiltonian demands expert judgement at every step: which observables to measure, where in parameter space to compute, or how to separate genuine…
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Exploiting the Weyl-Chamber Structure for Hardware-Aware Quantum Circuit Compression
arXiv quant-ph
arXiv:2610.32812v1 Announce Type: new Abstract: Quantum circuit compression based on tensor networks enables long-time simulation of quantum many-body dynamics on near-term hardware. While Riemannian optimization has been successfully…
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Efficient Ground-State Manifold Amplification for Rydberg Atom Arrays via Houdayer Cluster Updates
arXiv quant-ph
arXiv:2610.28528v2 Announce Type: replace Abstract: We demonstrate a hybrid quantum-classical approach for exploring ground-state manifolds of maximum independent set problems, in which quantum hardware supplies the initial solutions and…
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Photon-Number Discrimination from Increasing Time-of-Arrival Separation in Wide Superconducting Microstrip Single-Photon Detectors
arXiv quant-ph
arXiv:2610.32154v1 Announce Type: new Abstract: Measurements of photon-number-dependent time-of-arrival (TOA) distributions in wide NbN superconducting microstrip single-photon detectors (SMSPDs) are presented. Two \SI{10}{\um}-long…
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Fidelity Dynamics of a Jaynes--Cummings Qubit under Markovian and Non-Markovian Coupling Noise
arXiv quant-ph
arXiv:2610.31938v1 Announce Type: new Abstract: We analytically investigate the fidelity dynamics of a Jaynes--Cummings qubit coupled to a single-mode cavity in the presence of stochastic fluctuations of the qubit--cavity coupling. Such…
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Entangling gates for the SU(N) anyons
arXiv quant-ph
arXiv:2605.04016v2 Announce Type: replace-cross Abstract: The model of a topological quantum computer is a promising one due to its natural resistance to noise and other errors. Operations in such a computer are implemented by braiding the…
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Generating entanglement in quantum matter with pathway-entangled photons via resonant inelastic X-ray scattering
arXiv quant-ph
arXiv:2610.32936v1 Announce Type: new Abstract: Resonant inelastic X-ray scattering (RIXS) is conventionally used to probe elementary excitations and correlations in quantum materials. Here, we propose an interferometric RIXS protocol that…
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Interpreting Liouvillian Eigenmodes: Quantized Orbits in Dissipative Systems
arXiv quant-ph
arXiv:2606.20271v2 Announce Type: replace Abstract: In closed quantum dynamics, energy eigenstates represent physical excitations which, for systems with a classical limit, localize on quantized orbits in phase space. Such a picture is…
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Classical Pre-Training of Large Shallow Parametrized Quantum Circuits through Pauli Propagation and deployment on Quantum Hardware
arXiv quant-ph
arXiv:2610.32571v1 Announce Type: new Abstract: Scaling parametrized quantum circuits to a larger number of qubits is a central challenge in Quantum Machine Learning: gradient estimation via the parameter-shift rule quickly becomes…
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Temporal Degeneracy Limits Message Passing Decoding of QLDPC Codes Under Repeated Noisy Syndrome Measurements
arXiv quant-ph
arXiv:2610.31877v1 Announce Type: new Abstract: Practical quantum computations can require logical error rates of $10^{-12}$ or lower. Quantum low-density parity-check (QLDPC) codes are promising candidates for reaching such rates with low…
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Universal quantum coding
arXiv quant-ph
arXiv:2609.38038v2 Announce Type: replace Abstract: Entanglement distillation from noisy bipartite states and reliable quantum communication over noisy channels are fundamental tasks in quantum information theory. Yet existing coding…
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A Topology-Aware Quantum-Classical Framework for Multi-Target Active Debris Removal using Gaussian Boson Sampling
arXiv quant-ph
arXiv:2610.31824v1 Announce Type: cross Abstract: The continued growth of orbital debris threatens the safety and sustainability of near-Earth space, making Active Debris Removal (ADR) an important mitigation strategy. Selecting $k$…
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Quantum Evolution Networks Learn Long-Time Coherent Dynamics in Driven Spin Registers
arXiv quant-ph
arXiv:2610.32156v1 Announce Type: new Abstract: Predicting and controlling driven quantum systems requires access to dynamics across physical parameters, initial states, and evolution times. A reusable neural model must capture this…
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Discrete WKB approach to density profiles in inhomogeneous two-band free-fermion chains
arXiv quant-ph
arXiv:2610.32710v1 Announce Type: cross Abstract: We extend the discrete WKB method to one-dimensional bipartite tight-binding chains of free fermions with slowly varying hopping amplitudes and on-site potentials. We focus on the…
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QubiC 2.0: An Extensible Open-Source Qubit Control System Capable of Mid-Circuit Measurement and Feed-Forward
arXiv quant-ph
arXiv:2309.10333v2 Announce Type: replace Abstract: Researchers manipulate and measure quantum processing units via the classical electronics control system. We developed an open-source FPGA-based quantum bit control system called QubiC…
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Quantum Cryptomania with Classical Communication without One-Way Functions
arXiv quant-ph
arXiv:2610.32145v1 Announce Type: new Abstract: In classical cryptography, one-way functions are necessary for most of cryptography. In the quantum world, however, Kretschmer at {TQC'21} and subsequent works have demonstrated that quantum…
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Geometry-controlled zeros of resonant Kelvin-wave conversion in four spatial dimensions
arXiv quant-ph
arXiv:2610.29218v2 Announce Type: replace-cross Abstract: Geometry can suppress leading Kelvin-wave conversion even at exact momentum and frequency resonance. We demonstrate this on a vortex surface in four spatial dimensions…
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Graphical Rigidity of Continuous Variable Graph States under Gaussian Local Transformations
arXiv quant-ph
arXiv:2610.31933v1 Announce Type: new Abstract: Multimode entangled pure Gaussian states are an essential resource for continuous variable (CV) quantum information processing. Menicucci et al. [2011] have shown how to describe them as…
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Freezing and Shielding under Global Quenches for Long-Range Interacting Many-Body Systems
arXiv quant-ph
arXiv:2407.06072v2 Announce Type: replace Abstract: We investigate how local perturbations spread on long-range interacting spin chains and show how their nonequilibrium behavior exactly matches the one of a Fermi-Hubbard model with…
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Hardware-Friendly Estimation of LCU-Based Expectation Values via Quantum-to-Classical Workload Shifting
arXiv quant-ph
arXiv:2610.32841v1 Announce Type: new Abstract: Estimating the expectation value of an observable $O$ for a quantum state evolved under a general, possibly non-unitary, operator $A$ is a fundamental task in quantum simulation, chemistry…
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From Link Availability to Deadline-Constrained Key Service: A Feasibility Framework for Mobile Free-Space Quantum Key Distribution
arXiv quant-ph
arXiv:2610.32634v1 Announce Type: new Abstract: Mobile free-space quantum key distribution (QKD) links can provide secret bits intermittently, whereas applications may need cryptographic key material at specified times. Optical…
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Photon-Pair Advantage for Dissipative Parameter Estimation in Whispering-Gallery-Mode Interferometers
arXiv quant-ph
arXiv:2610.32541v1 Announce Type: new Abstract: We study the estimation of detuning and intrinsic loss in a lossy whispering-gallery-mode (WGM) resonator located in a balanced Mach--Zehnder interferometer. We use indistinguishable photon…
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Coupling phase interference effects in a multimode cavity magnonics system
arXiv quant-ph
arXiv:2607.20234v2 Announce Type: replace Abstract: Coupling phases play a decisive yet often overlooked role in cavity magnonics, particularly in complex multimode systems. Here, we investigate phase-mediated interference effects in a…
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Field-Modified Quantum Potentials from Tridiagonal Representations: Analytical Spectra and Galerkin Simulations
arXiv quant-ph
arXiv:2609.23348v2 Announce Type: replace Abstract: We develop an effective radial framework for analyzing new field-modified potential function of a charged spinless particle in collinear electric and magnetic fields. Using the weak…
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Fundamental bound on Wigner negativity generation from environmental collisions
arXiv quant-ph
arXiv:2610.32315v1 Announce Type: new Abstract: Beyond quadratic potentials, classical evolution laws are typically thought to arise from quantum theory as an approximate description. Here we show that classical evolution laws can emerge…
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Local Thermodynamics and R\'enyi Bounds on Black Hole Mergers
arXiv quant-ph
arXiv:2610.31680v1 Announce Type: cross Abstract: R\'enyi entropy inequalities have been proposed to strengthen the area-theorem bound on mergers of thermodynamically stable black holes in Anti de Sitter (AdS) space. The stronger bounds…
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Noise-Assisted Quantum Entanglement: Memory-Enhanced Coherence in Stochastic Jaynes-Cummings Dynamics
arXiv quant-ph
arXiv:2610.31947v1 Announce Type: new Abstract: We investigate qubit entanglement dynamics in a two-qubit cavity system with stochastically fluctuating coupling strength, comparing white noise (Markovian) and Ornstein-Uhlenbeck noise…
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Mutual Information Across Quantum Reference Frame Perspectives
arXiv quant-ph
arXiv:2610.31729v1 Announce Type: new Abstract: In quantum information theory, standard notions typically presuppose a fixed partition of the world into subsystems, encoded in a tensor product structure of the Hilbert space. Yet, in some…
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Verified Pauli-Product Measurement Compilation for Fault-Tolerant Quantum Computation
arXiv quant-ph
arXiv:2610.31694v1 Announce Type: new Abstract: Fault-tolerant quantum compilers implement gates through Pauli-product measurements and classical feedback. Verifying such a compiler requires reasoning about the quantum state and the…
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Optimal Control of a Fluxonium Circuit with the Q-PRONTO Numerical Method
arXiv quant-ph
arXiv:2610.31885v1 Announce Type: new Abstract: Optimizing the control of large quantum systems is a resource-intensive task, where the convergence rate of the underlying iterative schemes is crucial. The recently developed Quantum…
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Demonstrating RFSoC-based Control of a Fully Connected Exchange-Only Qubit
arXiv quant-ph
arXiv:2610.31998v1 Announce Type: new Abstract: Semiconductor triple-quantum dots (TQDs) are a promising platform for scalable quantum information processing, but the community has so far lacked access to affordable and flexible high-speed…
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Additive uncertainty relations via pseudospectral methods
arXiv quant-ph
arXiv:2610.32014v1 Announce Type: new Abstract: Given Hermitian observable $A$, the variance of $A$ is given by the difference of expectations $\langle A^2\rangle - \langle A\rangle^2$, where the expectation of an observable implicitly…
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Robustness of Quantum Correlations and Controlled Teleportation Fidelity under Noisy Channels
arXiv quant-ph
arXiv:2610.32049v1 Announce Type: new Abstract: In distributed quantum computing, quantum networks provide a potential infrastructure for long-range quantum information processing. Controlled quantum teleportation (CQT) is a key…
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Asymptotic scars arising from the remnants of quantum phase transitions
arXiv quant-ph
arXiv:2610.32037v1 Announce Type: new Abstract: Many-body localisation, Hilbert space fragmentation and quantum many-body scars (QMBS) are well-established mechanisms of ergodicity breaking in quantum systems. Recently, asymptotic quantum…
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Performing a Quantum Subroutine Using Cluster States
arXiv quant-ph
arXiv:2610.32227v1 Announce Type: new Abstract: Quantum subroutines, like their classical counterparts, serve as essential components of larger algorithms. They can be realized using gate based architectures or measurement based quantum…
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Two-Layer Verification for Fault-Tolerant Magic-State Preparation in High-Rate Quantum Codes
arXiv quant-ph
arXiv:2610.32267v1 Announce Type: new Abstract: Encoded magic states are essential for universal fault-tolerant quantum computation, but their resource-efficient preparation in high-rate quantum codes remains challenging. To address this…
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Near-field maps of topological edge states of molecular aggregates
arXiv quant-ph
arXiv:2610.32287v1 Announce Type: new Abstract: Self-assembled two-dimensional molecular aggregates provide a versatile platform for engineering excitonic states, including topologically nontrivial edge states. However, these edge-states…
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Finite Nonsignalling Resources Suffice to Simulate Entangled Qubits
arXiv quant-ph
arXiv:2610.32319v1 Announce Type: new Abstract: A longstanding question in Bell nonlocality is whether finite-alphabet nonsignalling resources can reproduce the continuum of measurement correlations of partially entangled qubits. Here we…
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A note on the monotonicity of observational ergotropic advantage
arXiv quant-ph
arXiv:2610.32585v1 Announce Type: new Abstract: Very recently, Mahanti et al. (arXiv:2609.18735) introduced the observational ergotropic advantage, which gives the maximum value of extra work that a measurement can obtain with respect to…
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The Compendium of Super-Quadratic Computational Quantum Advantages
arXiv quant-ph
arXiv:2610.32595v1 Announce Type: new Abstract: This compendium presents a structured collection of computational problems with credible prospects for realizing meaningful quantum advantage, focused on describing problem characteristics…
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QuantumBilliards.jl: An extensible, user friendly, high-performance Julia library for the large scale computation of spectra and eigenstates of quantum billiards and related problems
arXiv quant-ph
arXiv:2610.32605v1 Announce Type: new Abstract: We present QuantumBilliards.jl, an open-source Julia library providing a suite of numerical solvers for the two-dimensional interior Helmholtz eigenproblem with Dirichlet boundary conditions…
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Elementary proofs of quantum lower bounds for element distinctness and k-sum
arXiv quant-ph
arXiv:2610.32693v1 Announce Type: new Abstract: We give elementary proofs of the $\Omega(n^{2/3})$ quantum query lower bound for element distinctness and the $\Omega(n^{k/(k+1)})$ lower bound for the $k$-sum problem, for fixed $k$ and…
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Optimal probes for estimating the dephasing of a quantum spin system
arXiv quant-ph
arXiv:2610.32724v1 Announce Type: new Abstract: We investigate the optimal estimation of dephasing in finite-dimensional quantum spin systems. We first discuss some properties of the optimal probe states and present an efficient numerical…
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Fermion Scattering on Quantum Computers
arXiv quant-ph
arXiv:2610.32882v1 Announce Type: new Abstract: Resonant scattering links particle interactions to the formation and decay of unstable excitations. We develop a hybrid quantum-computing framework to study these dynamics through…
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Modular optical fault-tolerant quantum computation via an interface between verified resources and online logical operations
arXiv quant-ph
arXiv:2610.32838v1 Announce Type: new Abstract: We introduce a factory--processor interface architecture for modular optical fault-tolerant quantum computation that separates code-dependent encoded-resource preparation from reusable online…
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Nonclassicality from Incomplete Fock-State Statistics
arXiv quant-ph
arXiv:2610.32908v1 Announce Type: new Abstract: Nonclassicality in bosonic systems can be certified directly from occupation probabilities without full state reconstruction. To complete a library of such criteria we introduce a numerical…
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Distributed Quantum-Centric Supercomputing with Multi-Layered Generative Learning for Intermolecular Interactions
arXiv quant-ph
arXiv:2610.32968v1 Announce Type: new Abstract: Quantum-centric supercomputing (QCSC) approaches, such as sample-based quantum diagonalization (SQD), combine quantum processors with high-performance computers (HPC), offering a promising…
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Can Spontaneous Time-Translation Symmetry Breaking Be Quantized Without Explicit Branches?
arXiv quant-ph
arXiv:2610.32030v1 Announce Type: cross Abstract: Can classically branched dynamics associated with spontaneous time-translation-symmetry breaking be quantized without explicitly retaining the branches of the Hamiltonian? We investigate…
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Kinetic competition controls loss-induced exceptional points of Hubbard pairs
arXiv quant-ph
arXiv:2610.32123v1 Announce Type: cross Abstract: Two-body loss can bind two fermions in a Hubbard lattice, yet the binding threshold in the infinite lattice need not be an exceptional point (EP). At fixed total momentum $\mathbf{K}$, the…
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Single-step SU(3) Hahn Echo in a Qutrit Atom Interferometer
arXiv quant-ph
arXiv:2610.32160v1 Announce Type: cross Abstract: The Hahn echo is a well-known dynamical decoupling method that refocuses the dephasing due to energy inhomogeneities of a spin-1/2 ensemble and is widely used to extend phase coherence in…
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Quantum Landau Lifshitz Gilbert equation in ferromagnetic conductors and magnetic insulators
arXiv quant-ph
arXiv:2610.32405v1 Announce Type: cross Abstract: Understanding the microscopic origin of magnetic damping is essential for describing magnetization dynamics in nanoscale magnetic systems. In this work, we develop a microscopic framework…
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Stochastic and quantum autonomous information machine: efficiency fluctuations, precision and optimization
arXiv quant-ph
arXiv:2610.32683v1 Announce Type: cross Abstract: We investigate the conversion between thermal and informational resources in an autonomous machine coupled to thermal reservoirs and a tape, playing the role of an information reservoir…
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Ideal interaction dynamics of defects and background fields in condensed matter
arXiv quant-ph
arXiv:2610.32973v1 Announce Type: cross Abstract: While defect dynamics in condensed matter systems is widely studied and several methods are available to track the defect position over time, the formulation of dynamical models for the…
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Open quantum spin chains with non-reciprocity: a theoretical approach based on the time-dependent generalized Gibbs ensemble
arXiv quant-ph
arXiv:2601.08606v2 Announce Type: replace Abstract: We study an open quantum spin chain with non-reciprocal dissipation using a theoretical approach known as time-dependent generalized Gibbs ensemble. In the regime of weak dissipation the…
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A Counterexample to the Optimality Conjecture in Convex Quantum Channel Optimization
arXiv quant-ph
arXiv:2512.22863v3 Announce Type: replace Abstract: This paper presents a counterexample to the optimality conjecture for the trace distance based optimal state transformation problem proposed by Coutts et al. [Quantum 5, 448 (2021)]. The…
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Authentication in Security Proofs for Quantum Key Distribution
arXiv quant-ph
arXiv:2601.17960v2 Announce Type: replace Abstract: Quantum Key Distribution (QKD) protocols rely on authenticated classical communication. Typical QKD security proofs are carried out in an idealized setting where authentication is assumed…
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Comment on "Quantum Limits to Incoherent Imaging are Achieved by Linear Interferometry"
arXiv quant-ph
arXiv:2604.20353v2 Announce Type: replace Abstract: We show that the construction of the linear interferometer in the Supplemental Material of arXiv:1909.09581 is flawed, leading to a generally suboptimal solution. We then provide the…
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Transmitter-device-independent quantum key distribution
arXiv quant-ph
arXiv:2604.25225v4 Announce Type: replace Abstract: Transmitter-side device dependence is a longstanding yet implicit problem in quantum key distribution (QKD), in contrast to the thoroughly addressed measurement-side case. Quantum…
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Recent Advances in Quantum Architecture Search
arXiv quant-ph
arXiv:2604.26289v2 Announce Type: replace Abstract: Variational quantum algorithms (VQAs) constitute a prominent paradigm for exploring the capabilities of near-term quantum computers. As the effectiveness of VQAs depends heavily on the…
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Dynamics of the Density Cube
arXiv quant-ph
arXiv:2606.02421v2 Announce Type: replace Abstract: Density cube theory extends the canonical quantum density matrix $\rho_{ij}$ with the addition of an extra index to $\rho_{ijk}$. The elements of the density cube with two different…
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Pauli-Sparse regularised Counterdiabatic Shortcuts for Linear-Ramp QAOA
arXiv quant-ph
arXiv:2606.28536v2 Announce Type: replace Abstract: Combinatorial optimization is a leading target for quantum algorithms, but finite-depth QAOA can suffer from strong diabatic errors when the interpolation Hamiltonian has small, or…
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Resolving Nonlocal State Reduction via Induced Coherence in Frequency-Comb Biphoton Sources
arXiv quant-ph
arXiv:2610.27602v2 Announce Type: replace Abstract: How macroscopic definite outcomes and nonlocal correlations emerge from entangled superpositions across spacelike-separated regions without superluminal action or {\it ad hoc}…
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Bogoliubov Dynamics and Zitterbewegung in Optical Dirac Systems
arXiv quant-ph
arXiv:2610.32209v1 Announce Type: new Abstract: We develop a bosonic Bogoliubov description of Zitterbewegung in time-dependent optical-Dirac systems. Within the optical-Dirac framework, the anomalous pair-creation and pair-annihilation…
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Optimizing Quantum Battery via Counterdiabatic driving
arXiv quant-ph
arXiv:2610.32610v1 Announce Type: new Abstract: We analyze the energy charging of a quantum battery within an open quantum framework, where the interaction between the battery element and an external power source is mediated by an ancilla…
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Trace-distance characterization of recurrent pairwise synchronization in cavity-coupled superconducting qubits
arXiv quant-ph
arXiv:2610.32622v1 Announce Type: new Abstract: We theoretically investigate recurrent pairwise synchronization in three super?conducting qubits coupled to a common single-mode microwave cavity. The qubits interact indirectly through the…
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Correlation Harvesting by Unruh--DeWitt Detectors in a Cylindrical Cavity: Entanglement, Mutual Information, and Quantum Discord
arXiv quant-ph
arXiv:2605.28055v2 Announce Type: replace Abstract: We study correlations between two Unruh--DeWitt detectors coupled to a massless scalar field confined inside a cylindrical cavity through entanglement negativity, mutual information and…
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Engineering logical gates with irrep surface codes
arXiv quant-ph
arXiv:2610.06775v2 Announce Type: replace Abstract: Fault-tolerant quantum computation can incur a substantial resource cost when a desired logical operation must be constructed from a restricted set of logical primitives. To make such…
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Minimal unitary representations of time-invariant causal quantum channels
arXiv quant-ph
arXiv:2610.32823v1 Announce Type: new Abstract: In this work, we study quantum channels that respect causality in single-input-single-output linear time-invariant systems. We show that positive semidefinite kernels satisfying certain…
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Optimal Universal Bounds for Quantum Divergences
arXiv quant-ph
arXiv:2603.09885v3 Announce Type: replace Abstract: We identify a universal structural principle underlying the smoothing of classical divergences: the optimizer of the smoothing problem is a clipped probability vector, independently of…
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Proof of Shor's conjecture on the accessible information of quantum dichotomies
arXiv quant-ph
arXiv:2609.20600v2 Announce Type: replace Abstract: The accessible information of any given quantum ensemble quantifies the maximum amount of Shannon information that can be extracted from the ensemble by any quantum measurement. Almost…
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Quantum theory of laser noise in coherent-scattering levitated optomechanics
arXiv quant-ph
arXiv:2610.32368v1 Announce Type: new Abstract: State purity is a key resource for experimental tests of quantum mechanics with massive objects. Cavity cooling of a levitated nanoparticle via coherent scattering stands out as a strategy to…
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Traceable Quantum Secret Sharing
arXiv quant-ph
arXiv:2610.32218v1 Announce Type: new Abstract: Quantum secret sharing protects distributed quantum information against unauthorized reconstruction, yet existing schemes provide no intrinsic accountability when shares are leaked or forged…
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An Invitation to Algebraic Methods in Quantum Theory
arXiv quant-ph
arXiv:2610.32659v1 Announce Type: new Abstract: In this paper, we present various well-studied examples of quantum systems, and discuss how they might be analysed algebraically. We analyse the harmonic oscillator, hydrogenic atom, optical…
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Solution-phase fluorination of nanodiamond: near-surface NV$^-$ activation and spin relaxation
arXiv quant-ph
arXiv:2609.06605v2 Announce Type: replace Abstract: Nanodiamonds hosting luminescent point defects, known as fluorescent nanodiamonds (FND), are a leading platform for quantum technology. The nitrogen-vacancy (NV) centre is the most…
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Trident: Efficient Load Verification for Yoked Surface Codes using a Three-Level Memory Hierarchy
arXiv quant-ph
arXiv:2610.32152v1 Announce Type: new Abstract: Fault-Tolerant Quantum Computers (FTQCs) commonly use the surface code to encode program qubits as error-corrected logical qubits. Unfortunately, the surface code has a poor encoding rate, so…
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Eigenstate condensation in quantum systems with finite-dimensional Hilbert spaces
arXiv quant-ph
arXiv:2601.18869v2 Announce Type: replace Abstract: Random quantum states drawn from the Haar ensemble with a constraint on the energy expectation value $E_{\mathrm{av}} = \langle \psi | H | \psi\rangle$ display \textit{eigenstate…
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Certain Quantum States Already Require Quantum Time Evolution
arXiv quant-ph
arXiv:2610.32937v1 Announce Type: new Abstract: Model-independent tests of quantum theory, such as Bell inequality violations, focus on static properties of the theory and do not rely on its dynamical aspects. Hence, this core part of…
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Material criteria for angular-momentum transfer from twisted photons to photoelectrons
arXiv quant-ph
arXiv:2610.32121v1 Announce Type: cross Abstract: We study the material requirements for transferring the total-angular-momentum (TAM) projection of a twisted photon to the orbital angular momentum (OAM) of a photoelectron emitted from an…
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Continuous-time evolution via probabilistic angle interpolation and its applications
arXiv quant-ph
arXiv:2604.02854v3 Announce Type: replace Abstract: We explore the applicability of a stochastic time-evolution algorithm based on probabilistic angle interpolation. To simplify the pre-processing of the algorithm, we take the…
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Optimal Average Success Probabilities of Binary $(n,n-1)$ and $(n,n-2)$ Quantum Random Access Codes
arXiv quant-ph
arXiv:2607.10414v3 Announce Type: replace Abstract: A binary $(n,m)$ quantum random access code (QRAC) compresses an $n$-bit classical string into an $m$-qubit quantum state, from which a decoder attempts to recover a randomly selected…
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Identification and mitigation of errors in hole spin qubit readout
arXiv quant-ph
arXiv:2504.06898v2 Announce Type: replace-cross Abstract: High-fidelity readout of spin qubits in semiconductor quantum dots can be achieved by combining a radiofrequency charge sensor with spin-to-charge conversion and Pauli spin…
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Low-frustration block encodings by patch routing
arXiv quant-ph
arXiv:2610.32946v1 Announce Type: new Abstract: Block-encoding has emerged as a core primitive in many quantum algorithms, including quantum simulation. In this work, we design efficient and extensible methods for generating…
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Entangled logical qubits on a superconducting quantum processor
arXiv quant-ph
arXiv:2610.32347v1 Announce Type: new Abstract: We demonstrate high-fidelity logical qubit operations using \texttt{ibm\_phoenix}, a square-lattice array of 120 coupled superconducting qubits that are capable of fast reset. Using…
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A comprehensive benchmark of an Ising machine on the Max-Cut problem
arXiv quant-ph
arXiv:2507.22117v2 Announce Type: replace Abstract: QUBO formulations of combinatorial optimization problems allow for solving them using various quantum heuristics. While large-scale quantum computations are currently still out of reach…
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Succession of Ising criticality and its threshold in critical quantum Ising model subject to $X+ZZ$ decoherence
arXiv quant-ph
arXiv:2508.17871v2 Announce Type: replace Abstract: We investigate a mixed state quantum criticality in the Ising model under $X+ZZ$ decoherence. In the doubled Hilbert space formalism, the decohered state resides on the self-dual critical…
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Dissipative dynamics and superradiant countinuous time crystal in a Rydberg-interacting Dicke system
arXiv quant-ph
arXiv:2604.18119v2 Announce Type: replace Abstract: The interplay between many-body interactions and controlled dissipation provides a rich setting for nonequilibrium quantum phases. We explore the superradiant phase transitions in a…
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Coarse-Graining and Long-Range Response in Generated Systems
arXiv quant-ph
arXiv:2608.01989v4 Announce Type: replace-cross Abstract: We study when a reduced description preserves the response to an applied source. For systems defined by continuously differentiable state updates and observations a bounded…
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Bounding single-copy information causality violations
arXiv quant-ph
arXiv:2610.32783v1 Announce Type: new Abstract: Information causality is a physical principle that constrains bipartite post-quantum nonlocal correlations from information-theoretic assumptions. A direct characterization of the…
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High-quality, deep formation and identification of oxygen-vacancy defects in silicon carbide
arXiv quant-ph
arXiv:2610.32642v1 Announce Type: cross Abstract: Optically addressable paramagnetic defects in silicon carbide (SiC) are attractive for scalable quantum technologies such as quantum sensing. PL5, PL6, and PL7 are promising defects for…
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Bose-Einstein condensate in a shell: nonlinear modes and symmetry breaking
arXiv quant-ph
arXiv:2610.32249v1 Announce Type: cross Abstract: The state of a quantum particle confined to a spherical surface is commonly described using spherical harmonics, which play a crucial role in solving many scientific problems featuring…
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High Resolution Hyperspectral Quantum Infrared Imaging with Undetected Photons
arXiv quant-ph
arXiv:2610.32292v1 Announce Type: new Abstract: Quantum sensing in the infrared regime often demands the use of expensive and cryogenically operated detectors. Nonlinear interferometry has paved the way for information transfer from the…
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The Entire Quantum Computer on a Classical Leash
arXiv quant-ph
arXiv:2610.31775v1 Announce Type: new Abstract: We show that a classical client with no quantum hardware can use a single untrusted and potentially malicious quantum server as if it were its own trusted quantum computer. Through the…
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HQTN-SER: Speech Emotion Recognition with Hybrid Quantum Tensor Networks
arXiv quant-ph
arXiv:2605.14523v2 Announce Type: replace Abstract: Speech emotion recognition (SER) remains fragile in real-world conditions because emotional cues are subtle, speaker-dependent, and easily confounded by recording variability, while…
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Optimal phase estimation in the presence of correlated dephasing
arXiv quant-ph
arXiv:2511.07211v3 Announce Type: replace Abstract: We investigate optimal metrological protocols for phase estimation in the presence of correlated dephasing noise, including spin-squeezed state sensing strategies as well as parallel and…
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Lean-QuantumAlg: A Framework for AI Agents to Produce Quantum Algorithms that Humans Can Trust
arXiv quant-ph
arXiv:2610.30216v2 Announce Type: replace Abstract: AI agents are increasingly capable of constructing quantum algorithms and proofs, yet machine-checked proofs alone cannot guarantee that the intended problem is solved or that resource…
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In situ enhanced detectability of axions' responses in a microwave cavity
arXiv quant-ph
arXiv:2610.31717v1 Announce Type: cross Abstract: Microwave cavities in strong magnetic fields are among the most sensitive detectors for axion dark matter detection. Its sensitivity, however, is fundamentally limited by the second order…
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Quantum-aware Transformer model for state classification
arXiv quant-ph
arXiv:2502.21055v2 Announce Type: replace Abstract: Entanglement is a fundamental feature of quantum mechanics, playing a crucial role in quantum information processing. However, classifying entangled states, particularly in the…
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The Role of Quantum in Hybrid Quantum-Classical Neural Networks: An Empirical Assessment
arXiv quant-ph
arXiv:2601.04732v2 Announce Type: replace Abstract: Quantum machine learning has emerged as a promising application domain for near-term quantum hardware, particularly through hybrid quantum-classical models that leverage both classical…
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Quantum Complexity and Stabilizer-State Expansions: From Pairing to Deformation in Fermionic Systems
arXiv quant-ph
arXiv:2610.31792v1 Announce Type: new Abstract: Understanding how collective phenomena such as pairing and deformation emerge in interacting fermionic systems, and how the correlations underlying them shape the resources required for their…
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Quantum Machine Learning in Medical Imaging: A Primer for Radiologists
arXiv quant-ph
arXiv:2610.32762v1 Announce Type: new Abstract: Deep learning has transformed radiology, but the computational cost of training and deploying modern models is outpacing what classical hardware can support. Quantum computing has been…
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A General Composition Theorem for Approximate Degree
arXiv quant-ph
arXiv:2609.30139v2 Announce Type: replace-cross Abstract: A longstanding open question in Boolean function complexity asks whether approximate degree composes multiplicatively under block composition. Although a general multiplicative…
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Entanglement Asymmetry and Asymmetry Contour under Boundary Symmetry Breaking
arXiv quant-ph
arXiv:2610.32733v1 Announce Type: new Abstract: We investigate how symmetry-breaking boundary magnetic fields affect magnetization and R\'enyi-2 entanglement asymmetry (EA) in the transverse-field Ising model. For the ground state…