Quantum Computing
Quantum Computing news — Friday 16 October 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
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NVision Quantum Technologies Expands into Molecular Quantum Computing with Photonic Integrated Architecture
Quantum Computing Report
NVision Quantum Technologies is expanding from its commercial hyperpolarized MRI platform into quantum computing hardware with its new PIQC (Photonic Integrated Quantum Chip) molecular architecture. This strategy utilizes synthetic organic…
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Anderon Releases First Superconducting Quantum PDK
The Quantum Insider
Insider Brief Anderon has released its first superconducting quantum Process Design Kit (PDK), providing design components for quantum devices and circuits on its 300mm wafer fabrication platform. The PDK includes components for qubits…
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Germany Publishes National Post-Quantum Cryptography Migration Guideline
The Quantum Insider
Insider Brief Germany’s BMI, BMDS and BSI have published a national guideline for implementing the EU roadmap for transitioning to post-quantum cryptography (PQC). The guideline recommends completing migrations for high-risk systems by the…
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QuEra Scientists Named Co-Principal Investigators on Three of Nine Teams in DOE’s Quantum Chemistry Program
The Quantum Insider
Insider Brief QuEra Computing scientists will serve as co-principal investigators on three of nine teams selected for the US Department of Energy ‘s $37 million Quantum Computing for Computational Chemistry (QC3) program. The projects…
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In ‘Quantum 101’ Session, WTO Trade Officials Hear Quantum Encryption Window May Close Within Five Years
The Quantum Insider
Insider Brief A “Quantum 101” session at the World Trade Organization, co-organized by the permanent missions of Israel, Singapore and Switzerland, introduced trade negotiators to quantum technologies and their implications for trade…
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Terra Quantum Joins QuEra Quantum Alliance
The Quantum Insider
Insider Brief Terra Quantum has joined the QuEra Quantum Alliance, adding its quantum software, algorithms and enterprise application expertise to the neutral-atom quantum computing partner network. Terra Quantum ‘s TQ42 platform provides…
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Google Demonstrates Method to Cut Errors in Quantum Computing’s ‘Magic States’
The Quantum Insider
Insider Brief Google demonstrated magic-state cultivation on its Willow quantum processor, reducing state-preparation errors about 40-fold and reporting 99.99% logical fidelity, potentially lowering resource demands for error-corrected…
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Boundary-induced geometrical frustration in a square Rydberg-atom lattice
arXiv quant-ph
arXiv:2610.20723v1 Announce Type: cross Abstract: We study geometric defects in square-lattice Rydberg-atom arrays induced by lattice-size parity in the striated density-wave phase. While odd-sized lattices select a single striated domain…
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Schr\"odinger's unpublished hidden-variable model in the 1944-45 debate over the "Collapse of Determinism"
arXiv quant-ph
arXiv:2610.20752v1 Announce Type: cross Abstract: In the mid-1940s, the question of whether quantum mechanics could be supplemented by deterministic hidden variables resurfaced in a debate in ^textit{Nature}. I show that Erwin…
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Regret Lower Bound for Online Learning of Quantum States with Logarithmic Loss, with Applications to Quantum State Tomography and Confidence Sequences for Matrix Means
arXiv quant-ph
arXiv:2610.21273v1 Announce Type: cross Abstract: We study the problem of online learning of quantum states with logarithmic loss, which is a quantum generalization of online portfolio selection and has applications to quantum state…
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Realization Divergence in Multi-Provider Quantum Computing: A Pre-Registered Study of What Survives Measurement
arXiv quant-ph
arXiv:2610.21714v1 Announce Type: cross Abstract: Quantum programs pass through compilers, transpilers and vendor services before execution. However, the distance between what was written and what runs is rarely measured. We call this…
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A complete classification of perfect state transfer in Grover walks on abelian Cayley graphs
arXiv quant-ph
arXiv:2610.21946v1 Announce Type: cross Abstract: We completely classify connected Cayley graphs over finite abelian groups that exhibit perfect state transfer in Grover walks. First, we show that a Cayley graph over any finite group…
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Quantum Systems as results of Geometric Evolutions
arXiv quant-ph
arXiv:math-ph/0506038v6 Announce Type: cross Abstract: In the framework of deterministic finslerian models, a mechanism producing dissipative dynamics at the Planck scale is discussed. It is based on a geometric evolution from Finsler to…
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Thermodynamics of linear open quantum walks
arXiv quant-ph
arXiv:2601.22064v3 Announce Type: replace Abstract: Open quantum systems interact with their environment, leading to nonunitary dynamics. We investigate the thermodynamics of linear Open Quantum Walks (OQWs), a class of quantum walks whose…
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Clock-transition-enabled long electron spin coherence of telecom emitters in CeO$_2$
arXiv quant-ph
arXiv:2605.07332v3 Announce Type: replace Abstract: Rare-earth-ion-doped crystals has emerged as a promising platform for quantum technologies, owing to their narrow telecom-band optical emission, long spin memory, and compatibility with…
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The Klein-Gordon-Fock theory as a one-particle relativistic quantum mechanics
arXiv quant-ph
arXiv:2607.26431v4 Announce Type: replace Abstract: The Klein-Gordon-Fock (KGF) theory is presented as a single-particle relativistic quantum theory. A Schrodinger-type equation for a single-component wave function is derived. In addition…
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Optimality of Gaussian Entanglement of Formation
arXiv quant-ph
arXiv:2608.01909v3 Announce Type: replace Abstract: We prove that the entanglement of formation of every two-mode Gaussian state coincides with its Gaussian restriction, solving a longstanding open problem in continuous variable quantum…
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Reconstructing the phonon distribution of trapped ions out of the Lamb-Dicke regime
arXiv quant-ph
arXiv:2609.24147v2 Announce Type: replace Abstract: Characterizing the phonon distribution of trapped-ion motional states is essential for many applications in quantum information processing, but existing methods become ill-conditioned…
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Quantum Superposition Principle and Geometry
arXiv quant-ph
arXiv:quant-ph/0407242v4 Announce Type: replace Abstract: If one takes seriously the postulate of quantum mechanics in which physical states are rays in the standard Hilbert space of the theory, one is naturally lead to a geometric…
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Dark Subspaces and Invariant Measures of Quantum Trajectories
arXiv quant-ph
arXiv:2409.18655v2 Announce Type: replace-cross Abstract: Quantum trajectories are Markov processes describing the evolution of a quantum system subject to indirect measurements. They can be viewed as place dependent iterated function…
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Empirical Quantum Advantage in Constrained Optimization from Encoded Unitary Designs
arXiv quant-ph
arXiv:2511.14296v4 Announce Type: replace-cross Abstract: We introduce the Constraint-Enhanced Quantum Approximate Optimization Algorithm (CE-QAOA), a shallow, constraint-aware ansatz that operates inside the one-hot product space [n]^m…
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Emergent chiral Higgs mode in $\pi$-flux frustrated lattices
arXiv quant-ph
arXiv:2601.08925v2 Announce Type: replace-cross Abstract: Neutral-atom quantum simulators provide a powerful platform for realizing strongly correlated phases, enabling access to dynamical signatures of quasiparticles and symmetry breaking…
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Quantum Many-Body Mpemba Effect through Ruelle-Pollicott Resonances
arXiv quant-ph
arXiv:2603.11788v2 Announce Type: replace-cross Abstract: Relaxation towards equilibrium is often assumed to be slower when a system starts farther from equilibrium, but this intuition fails in the Mpemba effect. Recent advances in…
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Periodic conditional measurements on a photonic chip
arXiv quant-ph
arXiv:2610.21465v1 Announce Type: new Abstract: Quantum measurements not only extract information but also reshape quantum evolution through measurement backaction. Here, we investigate periodic conditional measurements, in which coherent…
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Quantum Uncertainty and Particle Trajectories: From Heisenberg and Schr\"odinger to Constructive Dynamical Models
arXiv quant-ph
arXiv:2609.29248v3 Announce Type: replace Abstract: Quantum uncertainty emerged from two strikingly different routes to quantum mechanics. Heisenberg's matrix mechanics replaced the classical description of atomic orbits by relations among…
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Opinion bubbles in the quantum Buridan's ass problem
arXiv quant-ph
arXiv:2610.21923v1 Announce Type: new Abstract: The quantum Buridan's ass problem concerns a network of interconnected nodes in which transitions between the nodes are governed by the laws of quantum mechanics. In such situations…
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Synergistic charging of a quantum battery via Dzyaloshinskii-Moriya interaction and non-Markovian noise
arXiv quant-ph
arXiv:2610.21928v1 Announce Type: new Abstract: Protecting quantum batteries from environmental noise remains a challenge. Using exact Burshtein-Kubo equations, we study a two-spin quantum battery with Dzyaloshinskii-Moriya (DM) coupling…
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Quantum control of solid state qubits via Reinforcement Learning
arXiv quant-ph
arXiv:2610.21987v1 Announce Type: new Abstract: The use of reinforcement learning (RL) in the design of quantum control strategies for pulse level control of NISQ era quantum devices is attracting growing interest. Model-free RL, not…
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Energetic channels in finite many-body quantum charging
arXiv quant-ph
arXiv:2610.22034v1 Announce Type: new Abstract: We examine how a finite many-body system can function as an effective charger for a single-qubit quantum battery, using the Lipkin-Meshkov-Glick model as a paradigmatic setting. As our figure…
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Patchwork: automated lattice surgery and space-time partitioning for real-time decoding
arXiv quant-ph
arXiv:2610.22112v1 Announce Type: new Abstract: We introduce patchwork, a lattice-surgery compiler for arbitrary multi-qubit Pauli measurements on a prescribed narrow-corridor two-dimensional surface-code layout. Systematic geometric rules…
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Constrained dissipation and the lifetime of quantum many-body scars
arXiv quant-ph
arXiv:2610.22223v1 Announce Type: new Abstract: We investigate the fate of quantum many-body scars in the PXP model subject to Markovian dissipation. We show that when local jump operators respect the same symmetries of the Hamiltonian the…
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Time-Rescaled STIRAP Enables Compact Cascaded Frequency Conversion
arXiv quant-ph
arXiv:2602.18930v3 Announce Type: replace Abstract: In this letter we explore how full frequency conversion can be performed in shorter optical devices by using a STIRAP-like protocol modified by the time rescaling shortcut to…
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Implementation of non-local arbitrary two-qubit controlled gates via geometric quantum computation with Rydberg anti-blockade
arXiv quant-ph
arXiv:2603.17656v2 Announce Type: replace Abstract: In the context of Rydberg anti-blockade, this paper proposes a new scheme for a high-fidelity controlled-unitary gate based on non-adiabatic holonomic quantum computation. Under specific…
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Quantum models with the Yang-Lee phase transition
arXiv quant-ph
arXiv:2606.19732v2 Announce Type: replace-cross Abstract: In this article, we present four different $1+1$D quantum models that realize the Yang-Lee (YL) phase transition under a deformation that preserves $PT$ symmetry. These are the…
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Perfect and peak state transfer on IBM quantum hardware
arXiv quant-ph
arXiv:2610.20855v1 Announce Type: new Abstract: We run continuous-time quantum walks with perfect and peak state transfer on a present-day superconducting quantum processor, IBM Quantum's $156$-qubit Heron device ibm_kingston, deliberately…
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Parallel Repetition for Entangled Games via Conditional Relative Entropy
arXiv quant-ph
arXiv:2610.21410v1 Announce Type: new Abstract: We give a proof of the cubic parallel-repetition bound for finite two-player entangled games using quantum conditional relative entropy. For a game with entangled value $1-\varepsilon<1$ and…
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Time-optimal robust quantum control for partially known errors
arXiv quant-ph
arXiv:2610.21596v1 Announce Type: new Abstract: Robust quantum control usually assumes one of two extremes: the error is of a known form and only its strength is unknown, or nothing at all is known about it. In practice one often sits in…
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Heisenberg-limited metrology from the quantum-quench dynamics of an anisotropic ferromagnet
arXiv quant-ph
arXiv:2512.23606v2 Announce Type: replace Abstract: The emerging field of quantum magnonics seeks to understand and harness the quantum properties of magnons -- quantized collective spin excitations in magnets. Squeezed magnon states arise…
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Coherent-State Kernels for Composite Quantum Operations
arXiv quant-ph
arXiv:2607.23240v2 Announce Type: replace Abstract: This paper develops a unified kernel-based method for computing exact matrix elements of composite quantum operations by inserting resolutions of the identity after individual operators…
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Finite-Frequency Boson-Number Bounds Across the Quantum Rabi Transition
arXiv quant-ph
arXiv:2610.21556v1 Announce Type: new Abstract: We consider the quantum Rabi model, a fundamental model of quantum optics describing a two-level system coupled to a bosonic mode, including counter-rotating terms. In the limit of large…
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Driving the cooling process of a quantum system via classical noise
arXiv quant-ph
arXiv:2610.21608v1 Announce Type: new Abstract: It is known that under particular hypotheses anomalous thermalization processes can occur, such as the Mpemba effect, consisting in a faster cooling down when the system is prepared in a…
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Thermal activation of photon catalysis in difference-intensity Mach-Zehnder interferometry with squeezed thermal light
arXiv quant-ph
arXiv:2610.22004v1 Announce Type: new Abstract: Realistic non-Gaussian operations, which can be implemented by mixing a nonclassical Gaussian state with a Fock state at a beam splitter and then heralding on a photon-number-resolving…
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Classical Capacity of Single-Mode Bosonic Gaussian Channels
arXiv quant-ph
arXiv:2610.22308v1 Announce Type: new Abstract: The classical capacity of a noisy optical channel is the maximum rate at which information can be transmitted reliably, given a constraint on the mean input energy. For the ubiquitous bosonic…
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Phase Retrievability of Super Operators and Measurements
arXiv quant-ph
arXiv:2607.26474v2 Announce Type: replace Abstract: We continue the study of Phase Retrieval in the Quantum Information setting in the style of \cite{liu2023phase}, in a manner which is more general in two primary ways: (a) Instead of only…
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A closed system setting for quantum thermalisation in free fermions
arXiv quant-ph
arXiv:2606.06362v2 Announce Type: replace-cross Abstract: We study thermalisation and the possible occurrence of the Mpemba effect in a closed quantum setting that mimics the interaction of a system with thermal reservoirs coupled only at…
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The noise cost of reservoir locality in broadband quantum amplifier chains
arXiv quant-ph
arXiv:2610.20654v1 Announce Type: new Abstract: Directional quantum amplifiers enable weak-signal readout while protecting the source, but reservoir noise limits sensitivity. Finite-band suppression must reconcile frequency-dependent…
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Mechanical trisqueezing in circuit quantum acoustodynamics with SNAIL devices
arXiv quant-ph
arXiv:2610.20670v1 Announce Type: new Abstract: Continuous-variable quantum information processing with mechanical oscillators requires a uni- versal gate set, including a genuine non-Gaussian evolution. While circuit quantum…
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Surviving readout errors and incomplete postselection in monitored quantum circuits
arXiv quant-ph
arXiv:2610.20712v1 Announce Type: new Abstract: We study how readout errors affect dynamics in monitored quantum circuits. Such errors make postselection effectively incomplete, conditioning trajectories on imperfect rather than true…
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Alternating Squeezing and Photon Subtraction for Optical Cat-State Generation
arXiv quant-ph
arXiv:2610.20728v1 Announce Type: new Abstract: Schr\"{o}dinger cat states are important non-Gaussian resources for quantum information processing and quantum-enhanced metrology. Although photon subtraction from squeezed vacuum states has…
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ZZ-Free bSWAP Gates under Strong Driving in Far-Detuned Fixed-Frequency Transmons
arXiv quant-ph
arXiv:2610.21936v1 Announce Type: new Abstract: Far-detuned frequency allocations in fixed-frequency superconducting processors mitigate spectral crowding but constrain cross-resonance interactions at practical drive amplitudes. Here, we…
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Loss-independent time-delay estimation via Hong-Ou-Mandel photon bunching detection
arXiv quant-ph
arXiv:2610.22023v1 Announce Type: new Abstract: In this work we study the application of two-photon correlated quantum states for high-precision time estimation. To achieve this, photon pairs were fed into a Hong-Ou-Mandel polarization…
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Bubble-Sort Exchange Networks: Symmetry Selection Rules and Language-Model Distillation on Exchange-Only Spin Chains
arXiv quant-ph
arXiv:2610.22093v1 Announce Type: new Abstract: On a chain of exchange-coupled quantum dots a Heisenberg exchange pulse of area pi is a SWAP, so the parallel bubble-sort SWAP network of superconducting chains is native to exchange-only…
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Programmable all-to-all entangling gates for cavity-coupled atoms
arXiv quant-ph
arXiv:2610.22220v1 Announce Type: new Abstract: Fault tolerant quantum computers greatly benefit from having both high fidelity entangling gates and a non-local qubit connectivity. However, most entangling gates for neutral atoms are…
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SynDebug: A Framework to Debug Logic Bugs in Fault-Tolerant Quantum Computing Programs
arXiv quant-ph
arXiv:2610.22275v1 Announce Type: new Abstract: Fault-tolerant quantum computing (FTQC) introduces substantial systems-level complexity through quantum error correction (QEC), making debugging FTQC programs challenging. Existing quantum…
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Putting a Temperature on Electron Correlation
arXiv quant-ph
arXiv:2610.22134v1 Announce Type: cross Abstract: It is common wisdom that a better understanding of how to quantify electron correlation should lead to more efficient treatments of the correlation problem. Here, we not only substantiate…
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General Quantum Protocol for Communication via $n$--Qubit GHZ States
arXiv quant-ph
arXiv:2512.14280v3 Announce Type: replace Abstract: This study presents a generalized $n$--bit superdense coding protocol that enables the transmission of n classical bits of information using an entangled $n$--qubit quantum system and the…
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Quantum steering in networks: Measurement-device-independent detection, continuous variables, and practical Gaussian schemes
arXiv quant-ph
arXiv:2606.25690v2 Announce Type: replace Abstract: We consider quantum steering certification in multipartite networks, with a focus on minimal trust scenarios: all-except-one parties are untrusted and treated device-independently. We…
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Error Correction in a Distributed Quantum Computer
arXiv quant-ph
arXiv:2609.13065v2 Announce Type: replace Abstract: Building fault-tolerant quantum computers with large numbers of logical qubits requires both scalable hardware architectures and error-correcting codes that make efficient use of physical…
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Efficient Learning of Structured Fermionic States under General Quadratic Evolution
arXiv quant-ph
arXiv:2610.08723v2 Announce Type: replace Abstract: We prove copy-optimal learning of the full Gaussian orbit of paired magic states on $n$ fermionic modes. The unknown evolution may be any parity-preserving quadratic circuit, including…
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Spread Complexity for Local Operator Quenches with Conserved Momentum
arXiv quant-ph
arXiv:2609.31867v2 Announce Type: replace-cross Abstract: We study a family of locally excited states in two-dimensional conformal field theories in different setups, defined on the plane, on the cylinder, or at finite temperature. These…
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Fluctuation-Induced Supersolidity at the Superfluid-Solid Interface
arXiv quant-ph
arXiv:2512.08739v2 Announce Type: replace-cross Abstract: Supersolidity, combining superfluid and crystalline orders, has been realized in dipolar Bose-Einstein condensates by tuning interatomic interactions. Here we show that…
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Size-Dependent High-Order Harmonic Generation from Linear Carbon-Chain Molecules in Linearly Polarized Laser Fields
arXiv quant-ph
arXiv:2610.21712v1 Announce Type: new Abstract: High-order harmonic generation from molecules is highly sensitive to molecular geometry and strong-field electron dynamics, providing a powerful route for probing and controlling ultrafast…
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Long-lived local coherences at high temperature from frozen domain walls
arXiv quant-ph
arXiv:2610.20724v1 Announce Type: cross Abstract: Local coherences between distinct charge sectors--measured by the single-particle Green's function or the transverse spin autocorrelation function--do not overlap with hydrodynamic modes…
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Standard and Bipolar Rectification in Tilted Periodically-Driven Quantum Systems
arXiv quant-ph
arXiv:2610.20765v1 Announce Type: new Abstract: Developing mechanisms to control transport in correlated quantum systems is essential for advancing quantum circuit technologies. In this work, we establish a rectification mechanism for both…
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Operator-Space Entanglement Entropy in Random Fermionic Gaussian Dynamics
arXiv quant-ph
arXiv:2610.21723v1 Announce Type: new Abstract: We study the von Neumann operator-space entanglement entropy (OSEE) of initial product operators evolved under random gaussian dynamics, as modeled by a Brownian SYK$_2$ model. By exploiting…
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One generation of the Standard Model as a quantum error-correcting code
arXiv quant-ph
arXiv:2610.21879v1 Announce Type: cross Abstract: Together with a right-handed neutrino, the fermions of one generation of the Standard Model are labelled by five bits, a combinatorial structure tied to anomaly cancellation. We make this…
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Instability-enhanced quantum sensing with tunable multibody interactions
arXiv quant-ph
arXiv:2604.05047v2 Announce Type: replace Abstract: Dynamical instabilities can amplify small perturbations into measurable signals, offering a route to quantum-enhanced sensing. This mechanism was experimentally demonstrated in a…
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On the coincidence of discrete and continuous definitions of Entanglement of Formation
arXiv quant-ph
arXiv:2610.18816v2 Announce Type: replace Abstract: It is proved that every Borel ensemble of pure states on a separable bipartite Hilbert space with finite average entanglement admits a countable ensemble with the same barycenter and…
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A tutorial on quantum scattering theory and coupled-channel calculations of bimolecular collisions
arXiv quant-ph
arXiv:2610.20882v1 Announce Type: new Abstract: Collisions between atoms and molecules govern how energy is exchanged and redistributed in the gas phase, underpinning phenomena from spectral line broadening and interstellar molecular…
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Geometric Optimization over Quantum State Spaces: Tight Uncertainty Relations and Resource Certification
arXiv quant-ph
arXiv:2602.00595v3 Announce Type: replace Abstract: Determining the fundamental limits of nonlinear functionals of quantum measurement statistics is a crucial yet generally intractable nonconvex optimization problem. We introduce a generic…
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The bulk spectral gap is certifiable from above but uncomputable from below
arXiv quant-ph
arXiv:2606.03836v4 Announce Type: replace Abstract: Determining spectral gaps in the thermodynamic limit is a central challenge in quantum many-body physics. When a fixed boundary condition is imposed, this problem is undecidable: no…
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Is a covariant virtual tachyon viable?
arXiv quant-ph
arXiv:2602.20474v3 Announce Type: replace-cross Abstract: Sidney Coleman has noted that superluminal particles or observers would be able to go back in time and have no definite trajectory according to subluminal observers, while not…
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Generalised entanglement wedges in three dimensions
arXiv quant-ph
arXiv:2610.07176v2 Announce Type: replace-cross Abstract: Generalized entanglement wedges (GWs), proposed by Bousso and Penington for gravitating regions in general spacetimes, share many properties of ordinary entanglement wedges…
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Molecule-by-molecule nanoresolved picosecond Purcell-enhanced emission at room-temperature in hollow plasmonic nanocone metamaterials
arXiv quant-ph
arXiv:2506.15095v2 Announce Type: replace-cross Abstract: Nanoscale variations in the electromagnetic environment strongly influence quantum emission processes, yet direct quantitative visualization of these effects at the single-emitter…
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A modular quantum computer based on Cornucopia codes
arXiv quant-ph
arXiv:2610.19073v2 Announce Type: replace Abstract: Ultra-high-rate quantum error correction codes store many logical qubits in a single code block with few physical qubits. A fault-tolerant quantum computer, however, also requires a…
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A constructive solution to the $n$-representability problem
arXiv quant-ph
arXiv:2610.20737v1 Announce Type: new Abstract: We present a solution to the fermionic quantum marginal problem by constructing the complete family of two-body witnesses at each level of a weighted sum-of-squares hierarchy. Our…
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Same Spectrum, Harder First-Order Training: Phase-Locking in Single- versus Multi-Qubit Re-Uploading Circuits
arXiv quant-ph
arXiv:2610.21778v1 Announce Type: new Abstract: Angle-encoded variational quantum circuits implement truncated Fourier series. For one-dimensional inputs, a single-qubit re-uploading (serial) circuit represents every function that a…
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Realization of a cavity-coupled Rydberg array
arXiv quant-ph
arXiv:2602.12152v2 Announce Type: replace Abstract: Scalable quantum computers and quantum networks require the combination of quantum processing nodes with efficient light-matter interfaces to distribute quantum information in local or…
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Entanglement of superpositions in zero-energy subspace: insights from stabilizer theory
arXiv quant-ph
arXiv:2610.20846v1 Announce Type: new Abstract: Exact zero-energy eigenstates built from entangled dimers have recently been found in a large class of spin Hamiltonians. While the individual states have a simple structure, their…
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Remote Gottesman-Kitaev-Preskill Entanglement Generation between Trapped Ions
arXiv quant-ph
arXiv:2610.21754v1 Announce Type: new Abstract: Distributing entanglement directly between error-corrected logical qubits is an important capability for scalable quantum networks. We propose a heralded protocol for generating remote…
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Quantum-compatible Riemannian conjugate gradient for ground-state preparation
arXiv quant-ph
arXiv:2610.21782v1 Announce Type: new Abstract: Riemannian optimization provides a natural geometric framework for designing quantum algorithms for ground-state preparation, most notably through quantum imaginary-time evolution. However…
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Operational Limits of Gravity-Mediated Entanglement
arXiv quant-ph
arXiv:2610.22097v1 Announce Type: new Abstract: Tests of gravity-mediated entanglement aim to determine whether two massive objects in spatial superposition can become entangled through their mutual gravitational interaction. In an ideal…
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Diffusion Language Models as Open Quantum Systems
arXiv quant-ph
arXiv:2610.21672v1 Announce Type: cross Abstract: Diffusion language models generate text by reversing a classical diffusion process over token sequences. We show that their continuous-time forward and reverse dynamics can be embedded in…
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monoprop: Scaling Pauli and Majorana propagation via Anticommutation Indices
arXiv quant-ph
arXiv:2610.21000v1 Announce Type: new Abstract: We introduce monoprop, an open-source, massively parallel operator-propagation framework for fermion and qubit bases. For $N$ qubits or modes, existing codes represent each of the $K$ tracked…
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Quantum instanton approach to metastable collective spin systems: Numerical implementation and applications
arXiv quant-ph
arXiv:2610.21684v1 Announce Type: new Abstract: Driven-dissipative collective spin systems can host several long-lived metastable states; rare switching between them governs slow relaxation and first-order dissipative phase transitions…
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Connectivity Bounds for GHZ Graphs
arXiv quant-ph
arXiv:2610.22190v1 Announce Type: new Abstract: Greenberger-Horne-Zeilinger (GHZ) states are multipartite entangled quantum states that play a central role in quantum information theory, with applications in quantum communication…
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Discovering state-of-the-art quantum circuits with large language models
arXiv quant-ph
arXiv:2610.22367v1 Announce Type: new Abstract: Significant efforts are currently being directed toward the implementation of large-scale quantum information processors, but realizing useful quantum advantage also requires the development…
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Finite-cutoff geometry from double-scaled SYK
arXiv quant-ph
arXiv:2610.20703v1 Announce Type: cross Abstract: We develop a finite-cutoff holographic description of the double-scaled SYK (DSSYK) model. We construct microscopic deformations of Kourkoulou-Maldacena and thermofield-double SYK states…
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Data-Driven Optimization of Seminumerical Exchange for SIMD CPUs
arXiv quant-ph
arXiv:2610.21075v1 Announce Type: cross Abstract: We present a seminumerical exchange algorithm (SNK) based on the sn-LinK method [Laqua et al., J. Chem. Theory Comput. 16, 1456 (2020)], optimized for modern multi-core central processing…
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Displacement-noise-free gravitational-wave detector using quantum tomography of photon orbital angular momentum states
arXiv quant-ph
arXiv:2610.21112v1 Announce Type: cross Abstract: Gravitational waves (GWs) induce quantum transitions between photon orbital-angular-momentum (OAM) states with amplitudes $\alpha_{\pm}$. Exploiting this effect, we present a…
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Theory of Dispersion and Exchange Interactions Subjected to Surface Roughness in Application to Signal Transmission through a Nanoswitch
arXiv quant-ph
arXiv:2610.21652v1 Announce Type: cross Abstract: We present the theoretical description of a resistive nanoswitch designated for a change-over between the two operation modes by calculating the electri elastic, dispersion (van der Waals…
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Contextual Probability and Operational Minimality in Tug-of-War Decision Making
arXiv quant-ph
arXiv:2601.10034v4 Announce Type: replace Abstract: What connects minimal decision-making to contextual probability? We address this question through the Tug-of-War (TOW) principle, a resource-coupled mechanism for multi-armed bandit…
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Robustness of quantum spectrum estimation: weak Schur sampling under noisy inputs
arXiv quant-ph
arXiv:2610.03582v3 Announce Type: replace Abstract: We initiate the study of weak Schur sampling (WSS) under noisy inputs. Many optimal quantum learning algorithms rely on this measurement, for instance in quantum spectrum estimation (QSE)…
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Exact analytical spectra of an effective field-modified radial Schr\"odinger equation by the Nikiforov--Uvarov method
arXiv quant-ph
arXiv:2610.20159v2 Announce Type: replace Abstract: We revisit the effective radial Schr\"odinger equation for a charged spinless particle in collinear static electric and magnetic fields that was formulated in our earlier work within the…
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Approximate vortex lattices of atomic Fermi superfluid on a spherical surface
arXiv quant-ph
arXiv:2604.05216v2 Announce Type: replace-cross Abstract: While planar Fermi superfluids form Abrikosov vortex lattices under magnetic or effective gauge fields, spherical geometry forbids perfect lattices above 20 vortices. We…
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Singular wave functions and quantum collapse in inverse-power potentials
arXiv quant-ph
arXiv:2610.21044v1 Announce Type: new Abstract: Quantum collapse (QC) occurs under the action of the inverse-power potential U(r)=-U_{0}/(2r^{n}) in the framework of the Schroedinger equation. The corresponding stationary wave functions…
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When do quantum views help? Complementary classical-quantum representations in multi-view fusion
arXiv quant-ph
arXiv:2610.21395v1 Announce Type: new Abstract: Recent studies have reported promising results from quantum machine learning in drug discovery, healthcare, materials science and cybersecurity. Research includes comparisons with classical…
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Quantum computational advantage in random-circuit sampling on IBM superconducting quantum computers
arXiv quant-ph
arXiv:2609.28657v2 Announce Type: replace Abstract: We report forward random-circuit sampling (RCS) on the 120-qubit Nighthawk r2 superconducting processor (ibm_phoenix) with square-lattice connectivity, using 61 qubits, native CZ gates…
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Quantum prepare-and-measure scenarios: concepts and methods
arXiv quant-ph
arXiv:2610.20725v1 Announce Type: new Abstract: Prepare-and-measure scenarios are among the simplest and most widely used settings for quantum communication. A sender prepares a physical system in one of several possible states, which a…
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Reducing QUBO Complexity in Drone Delivery Through Classical Feasibility Preprocessing
arXiv quant-ph
arXiv:2610.21003v1 Announce Type: new Abstract: Drone-delivery planning combines routing decisions with operational constraints such as payload capacity and limited onboard energy, resulting in combinatorial optimization problems that can…
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Why finite-size non-Hermitian eigenvalues can miss asymptotic eigenstates in topological physics
arXiv quant-ph
arXiv:2601.05234v2 Announce Type: replace-cross Abstract: Non-Hermitian systems exhibit a fundamental spectral dichotomy absent in Hermitian physics: the eigenvalue spectrum and the eigenstate spectrum can deviate significantly in the…
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Syndrome-Resolved Decoding of Qubit Readout Errors
arXiv quant-ph
arXiv:2610.20810v1 Announce Type: new Abstract: Readout errors in superconducting qubits include incorrect state assignment, bit flips within the computational subspace, and leakage to non-computational states. These errors require…
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Classification of quantum states through conserved operators
arXiv quant-ph
arXiv:2610.20988v1 Announce Type: new Abstract: Determining whether quantum states can be interconverted by a prescribed set of transformations is a fundamental problem in quantum information. Here we develop a general classification…
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Practical Fidelity Estimation for Noisy Quantum Devices Using Direct and Survival-Probability-Based Protocols
arXiv quant-ph
arXiv:2610.21606v1 Announce Type: new Abstract: Reliable characterization of quantum states and quantum processes is central to the development of scalable quantum computing. Standard characterization techniques such as full quantum state…
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Superconducting circuits host two-level systems with lifetimes exceeding one second
arXiv quant-ph
arXiv:2610.21853v1 Announce Type: new Abstract: Understanding the microscopic environment of superconducting qubits is a central challenge for quantum technologies. Parasitic two-level systems (TLSs) of various microscopic origins are…
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Selected Stabilizer Subspaces for Compact Many-Body Wave Functions
arXiv quant-ph
arXiv:2610.21907v1 Announce Type: new Abstract: Selected configuration interaction (SCI) obtains accurate many-body solutions by variationally diagonalising the Hamiltonian in a sparse, iteratively selected set of configurations, but can…
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Correlation between normal character and Raman intensities of isotopologues of carbon dioxide
arXiv quant-ph
arXiv:2610.21707v1 Announce Type: cross Abstract: Previous studies on the vibrational structure of carbon dioxide isotopologues have revealed a correlation between the strength of Fermi interactions and a recently defined normal-mode…
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Jianmu-Q: Bridging Quantum Field Theory and Quantum Hardware with AI Agents
arXiv quant-ph
arXiv:2610.21942v1 Announce Type: cross Abstract: Quantum computing offers a promising approach to non-perturbative simulations of quantum field theories, particularly for real-time dynamics and systems affected by the sign problem. Yet…
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Optimal Calibration of Quantum Network Links
arXiv quant-ph
arXiv:2606.18167v2 Announce Type: replace Abstract: The reliable distribution of entanglement is essential for the effective operation of quantum networks. Due to fundamental differences between quantum and classical communication systems…
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Practical wavelength selection for quantum-augmented networks over shared optical fiber
arXiv quant-ph
arXiv:2610.20987v1 Announce Type: new Abstract: In a quantum augmented network, sharing optical fiber with classical traffic requires quantum wavelength selection to balance logical fidelity, block acceptance, and classical data reception…
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The Lov\'asz number is not alone: a continuum of R\'enyi points in the entanglement-assisted spectrum of graphs
arXiv quant-ph
arXiv:2610.20775v1 Announce Type: new Abstract: Li and Zuiddam's entanglement-assisted asymptotic spectrum of graphs consists of the normalized graph parameters that are additive under disjoint unions, multiplicative under strong products…
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Multiplicative Semidefinite Programming Upper Bounds on Quantum No-Signalling-Assisted Zero-Error Capacity
arXiv quant-ph
arXiv:2610.21071v1 Announce Type: new Abstract: We study zero-error communication and exact simulation of quantum channels assisted by quantum no-signalling correlations. For a channel with Kraus operator space $K$, we introduce a…
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Adding Temperature to the Adiabatic Connection: Hybrid Functionals for Static and Dynamic Correlation
arXiv quant-ph
arXiv:2610.22284v1 Announce Type: cross Abstract: Capturing static and dynamic electron correlation simultaneously at manageable computational cost remains a key challenge in electronic structure theory. Motivated by the recurring role of…
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Double-weak-link interferometer of hard-core bosons in one dimension
arXiv quant-ph
arXiv:2603.29583v2 Announce Type: replace-cross Abstract: We study the dynamics of a lattice hard-core boson gas released from a domain wall initial state in the presence of two weak links (defects). When the two defects are separated by a…
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Gyrators for superconducting circuit design
arXiv quant-ph
arXiv:2610.22145v1 Announce Type: new Abstract: Assuming only the solubility of Kirchhoff's laws, the conservation of energy, and the form of the constitutive relations, we present a flux-charge symmetric Hamiltonian formalism that always…
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Infinite magic and the emergence of the continuum
arXiv quant-ph
arXiv:2610.20790v1 Announce Type: new Abstract: Which features of a quantum state are needed for a relativistic quantum field theory to emerge from a lattice system? We address this question by establishing a quantitative relationship…
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Casimir forces on suspended thin dielectric membranes covered with graphene
arXiv quant-ph
arXiv:2610.21437v1 Announce Type: new Abstract: We investigate the Casimir force on thin suspended dielectric layers covered with graphene, both theoretically and experimentally. Thermal effects of the Casimir force on graphene occur at…
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Localized states of the non-Hermitian Schr{\"o}dinger equation with a complex $1/r^{2}$ potential: from Efimov states to bipolarons
arXiv quant-ph
arXiv:2610.21155v1 Announce Type: cross Abstract: We study the non-Hermitian Schr\"odinger equation with a complex $1/r^{2}$ potential, which bridges Hermitian few-body and non-Hermitian many-body physics: a real attractive potential…
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Crossovers between Time-Bin and Energy-Time Entanglement in Homodyned Resonance Fluorescence
arXiv quant-ph
arXiv:2610.21428v1 Announce Type: new Abstract: We theoretically investigate photonic entanglement generated by homodyning resonance fluorescence from a two-level emitter with a phase-locked laser field. Under weak excitation, increasing…
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Quantum Partial Information Decompositions, an Operational Order on Ensembles, and Direct Quantifications of Objective Information
arXiv quant-ph
arXiv:2610.20694v1 Announce Type: new Abstract: The partial information decomposition (PID) framework is an extension of classical information theory that enables a systematic analysis of the structure of information in multipartite…
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Symmetry-twisted multi-entropies: Order parameters for 2D SPT phases
arXiv quant-ph
arXiv:2607.12023v2 Announce Type: replace-cross Abstract: Although symmetry-protected topological phases (SPTs) can be distinguished by their entanglement properties, it has been unclear how to extract this information directly from…
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Stitched surface codes: planar concatenation through GHZ corridors
arXiv quant-ph
arXiv:2610.21357v1 Announce Type: new Abstract: We present a fault-tolerant quantum-memory architecture that concatenates four distance-t rotated surface-code patches with the [[4,2,2]] outer code, encoding two logical qubits at code…
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Three-axis Active Magnetic Compensation with Spatial Feedforward Matrix Decoupling and Hysteresis PI Regulation for Suppressing Zeeman Decoherence of Cold Atom Quantum Memories
arXiv quant-ph
arXiv:2610.21801v1 Announce Type: new Abstract: Cold-atom quantum memories require a near-zero magnetic environment (residual field <1 microtesla) to mitigate Zeeman decoherence. Conventional three-axis active compensation suffers from…
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Stability of Quantum LDPC States under Local Pauli Noise
arXiv quant-ph
arXiv:2610.22357v1 Announce Type: new Abstract: Quantum low-density parity-check (qLDPC) codes have a canonical mixed state---the normalized projector onto the code space---that lies at the intersection of quantum error correction and…
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Accurate gap control of 3D-integrated superconducting quantum circuits using asymmetric indium architecture and multi-angle flip-chip bonding
arXiv quant-ph
arXiv:2610.21435v1 Announce Type: new Abstract: Flip-chip 3D integration is a key enabling technology for overcoming the routing and layout constraints of planar superconducting quantum processors, but it requires accurate and uniform…
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Sparse anisotropic positive maps for qutrit entanglement: exact indecomposability and PPT geometry
arXiv quant-ph
arXiv:2607.12470v2 Announce Type: replace Abstract: Positive but not completely positive maps provide one of the most direct ways to detect entanglement beyond the positive-partial-transpose (PPT) criterion. We introduce and analyze an…
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Entanglement and apparent thermality in simulated black holes
arXiv quant-ph
arXiv:2509.22774v3 Announce Type: replace-cross Abstract: We investigate the apparent thermality of Hawking radiation in the semi-classical limit of quantum black holes using the mean-field limit of a chiral spin-chain simulator, which…
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Hybrid Quantum-Classical Optimization for Emergency-Priority Traffic Signal Control
arXiv quant-ph
arXiv:2610.21883v1 Announce Type: new Abstract: Emergency-priority traffic signal control requires reducing emergency-vehicle delay while limiting disruption to ordinary traffic. This work investigates a finite-horizon QUBO formulation and…
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Low-overhead tailoring and learning of noise in graph states
arXiv quant-ph
arXiv:2503.12870v3 Announce Type: replace Abstract: Graph and hypergraph states are important resource states for realizing universal quantum computation and diverse non-local physical phenomena. However, noise learning in such states is…
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Sparse-QITE: Discovering Compact Generators for Quantum Imaginary-Time Evolution via Regularization Methods
arXiv quant-ph
arXiv:2610.20791v1 Announce Type: new Abstract: Quantum imaginary-time evolution (QITE) provides a systematic route to ground-state preparation, but its cost grows rapidly with the locality $D$ of the unitary approximation, for which the…
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A Rydberg atom array coupled to a high-cooperativity optical cavity
arXiv quant-ph
arXiv:2610.20889v1 Announce Type: cross Abstract: Integrating Rydberg-state control of atom-atom interactions with cavity control of atom-light interactions enables the combination of local entangling operations with photon-mediated…
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Finite-size geometric crossover toward fragmentation of the potential energy shell in the quantum random energy model
arXiv quant-ph
arXiv:2610.21631v1 Announce Type: cross Abstract: The quantum random energy model (QREM) is a paradigmatic model for studying delocalization-localization transitions at finite energy density in Fock space. In the computational basis, its…
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Optimising multipartite entanglement manipulation in quantum networks
arXiv quant-ph
arXiv:2610.21420v1 Announce Type: new Abstract: Long-range, genuine multipartite entanglement (GME) between distant parties in a quantum network is a crucial resource for distributed quantum information processing. Through controlled…
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Efficient quantum simulation of unitary gates based on atomic ensembles
arXiv quant-ph
arXiv:2610.22207v1 Announce Type: new Abstract: We develop a technique to perform efficient unitary time evolution of a general spin Hamiltonian based on the system with identical qubits, as naturally realized by permutation symmetric…
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Representation-split Carleman lattice Boltzmann with near-unit step success probability on quantum computers
arXiv quant-ph
arXiv:2610.20620v1 Announce Type: cross Abstract: The Carleman lattice Boltzmann method replaces the quadratic collision of the lattice Boltzmann equation by a linear map on a lifted state. Existing block encodings of this map succeed with…
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Collective Organization of String Fragmentation
arXiv quant-ph
arXiv:2610.20793v1 Announce Type: cross Abstract: How coherent confining strings reorganize into hadronic matter is a central open problem in nonequilibrium gauge dynamics. Using real-time tensor-network simulations of the massive…
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Entanglement Detection with Rotationally Covariant Measurements -- From Compton Scattering to Lemonade
arXiv quant-ph
arXiv:2512.03984v2 Announce Type: replace Abstract: The accurate and efficient detection of quantum entanglement remains a central challenge in quantum information science. In this work, we study the detection of entanglement of polarized…
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Simulation of topological superconductors and their competing orders using photon-mediated interactions
arXiv quant-ph
arXiv:2512.17889v2 Announce Type: replace Abstract: Realizing and controlling the unconventional pairing featured by topological superconductors remains a central challenge. We introduce a cavity QED quantum simulator that engineers…
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Contractivity of time-dependent driven-dissipative systems
arXiv quant-ph
arXiv:2602.16067v2 Announce Type: replace Abstract: Experimentally relevant quantum systems are frequently described by a time-dependent Lindblad master equation in which the dissipation due to interaction with an environment is fixed, but…
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Parity-Based Time-Bin Encoding Enabling SWAP Between Polarization and Time-Bin Qubits
arXiv quant-ph
arXiv:2607.27144v3 Announce Type: replace Abstract: Multi-degree-of-freedom photonic quantum processing requires routing between degree-of-freedom (DOF) qubit encodings on a single photon. A SWAP between polarization and time-bin qubits is…
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The Dry Ten Martini Problem at Criticality
arXiv quant-ph
arXiv:2112.06869v3 Announce Type: replace-cross Abstract: We solve the dry ten martini problem (lean-verified this time) by showing that every labeled almost Mathieu gap is open for $\lambda\neq 0$ and every irrational frequency. In…
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Local finite rate semi device independent randomness expansion from quantum contextuality
arXiv quant-ph
arXiv:2610.21765v1 Announce Type: new Abstract: Finite rate randomness expansion (RE) which is secure against quantum adversaries is a crucial information processing task which is well studied in the case of two non-communicating parties…
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Magna: simulating magic state factories as cheaply as Clifford circuits
arXiv quant-ph
arXiv:2610.22315v1 Announce Type: new Abstract: Classical simulation of magic state factories, including distillation, cultivation, and code switching, is challenging because of their substantial non-Clifford content. We introduce…
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Probing Deconfined Quantum Criticality Point on a Digital Quantum Computer
arXiv quant-ph
arXiv:2610.21761v1 Announce Type: cross Abstract: A deconfined quantum critical point (DQCP) is a continuous transition between ordered phases with unrelated broken symmetries, beyond the Landau-Ginzburg-Wilson paradigm. In one dimension…
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Magic in quantum trajectory unravelings of noisy random quantum circuits
arXiv quant-ph
arXiv:2610.22318v1 Announce Type: new Abstract: The quantum-trajectory description of a noisy quantum circuit is not unique: every Kraus representation of the noise channel defines a different unraveling, i.e., a different ensemble of pure…
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Energetics of Fault-Tolerant Spin-Qubit Quantum Computation
arXiv quant-ph
arXiv:2610.22199v1 Announce Type: new Abstract: Semiconductor spin qubits offer a promising route to compact and scalable quantum computers, combining long coherence times in isotopically purified silicon with compatibility with…
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Classification of bipartite observables III: simplicity, mixtures and quantum error correction
arXiv quant-ph
arXiv:2610.22205v1 Announce Type: cross Abstract: The paradigm of a simple unstable theory in the sense of Shelah is the theory of the random graph, the Fra\"iss\'e limit of the finite graphs. Quantum error correction has a paradigm of its…
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Separability rigidity of Gaussian states under positive domination
arXiv quant-ph
arXiv:2609.36336v2 Announce Type: replace Abstract: We prove a separability rigidity theorem for finite-mode Gaussian states. Let $\rho_G$ be Gaussian and let $\mathcal I$ be a fixed partition of the modes. If $\rho_G$ dominates a nonzero…
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Exact distances and measurement allocation for logical Pauli readout
arXiv quant-ph
arXiv:2610.04306v2 Announce Type: replace Abstract: The minimum fault weight of a logical readout depends jointly on data-error persistence, check redundancy and time-boundary constraints. For any binary check matrix $H$ and nonzero parity…
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Looking Beyond Visibility: Resolving the Temporal Structure of Continuous-Wave Four-Photon Hong-Ou-Mandel Interference
arXiv quant-ph
arXiv:2610.21909v1 Announce Type: new Abstract: Hong-Ou-Mandel interference underpins many photonic quantum information protocols and is commonly characterized by a single visibility parameter. This quantity is typically obtained by…