Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Non-Markovian Poissonian Spontaneous Collapse Models
Nicolò Piccione·Jul 9, 2026
Spontaneous collapse models provide a possible solution to the measurement problem by modifying standard quantum dynamics. The modification consists of adding non-linear and stochastic terms inducing wavefunction collapse in space. Non-Markovian vers...
A Novel Parallel QCNN Architecture with Efficient Classical Simulability
Lawrence Nguyen, Hiu Yung Wong·Jul 9, 2026
This work presents a study of an implementation of a novel Quantum Convolutional Neural Network (QCNN) for binary classification of images from the Modified National Institute of Standards and Technology (MNIST) dataset. Using a novel architecture in...
A diagrammatic field theory of quantum error correction
Steven Rayan·Jul 9, 2026
We develop a field-theoretic framework for quantum error correction centred on fusion-space codes in unitary fusion categories. Admissible clusters determine total-charge sectors and orthogonal footprint projectors recording locally visible data left...
Keyless Covert Communication Over Quantum MACs with General Message Sets
Hassan ZivariFard, Xiaodong Wang·Jul 9, 2026
We study covert classical communication over quantum multiple-access channels (MACs) with general message sets. Specifically, we consider a fully quantum MAC with arbitrary message sets and an arbitrary number of transmitters. We demonstrate the feas...
Breaking Local-Minimum Traps in Spiking Neural Network-Based Solvers for CSPs via Parallel Tempering
Recep Bugra Uludag, Ahmet Efe, Ismail Akturk +1 more·Jul 9, 2026
Spiking neural networks (SNNs) with stochastic neurons can solve constraint satisfaction problems (CSPs) by encoding constraints via connectivity and performing probabilistic search via spike dynamics. However, fixed-temperature stochastic dynamics o...
Two-photon blockade without cascade channel in strong light-matter coupling
Hang-Hang Han, Zu-Jian Ying·Jul 9, 2026
We report a distinct two-photon blockade (termed as weak TPB) discovered in the strong-coupling regime of a parity-broken generalized quantum Rabi model, in addition to the other two-photon blockade (termed as strong TPB) in the ultrastrong coupling ...
Partially-Commutative Polynomial Optimization
Abhishek Mishra, Moisés Bermejo Morán, Stefano Pironio·Jul 9, 2026
Semidefinite programming hierarchies for commutative and non-commutative polynomial optimization represent a powerful computational tool with many applications in quantum information. In such applications, a given variable is typically not either com...
Exact Lindbladian Dynamics from Conformal Embeddings and Topological Defects in Conformal Field Theory
Chen Bai·Jul 9, 2026
Analyzing the dynamics of physical observables in open quantum many-body systems is a fundamental but highly challenging task that has yielded very few exact results. In this work, we identify intrinsic conformal structures that restore exact solvabi...
The Apparatus Strikes Back: Momentum Conservation and the Cost of Spatial Superpositions
Lucas C. Céleri, Diogo O. Soares-Pinto, Daniel A. Turolla Vanzella·Jul 9, 2026
Preparing massive particles in coherent spatial superpositions is a central objective of modern quantum science, motivated by applications ranging from fundamental tests of quantum mechanics and gravity to quantum-enhanced sensing. The experimental d...
Plaquette: A hardware-aware design platform for fault-tolerant quantum computers
Raul Conchello Vendrell, Carlos Díaz López, Ish Dhand +12 more·Jul 9, 2026
Hardware teams building fault-tolerant quantum computers (FTQCs) must decide which imperfections to suppress, and that decision requires the logical performance of the architecture under the device's actual noise. Hardware noise often departs from th...
Typicality of Steering for Two-qubit States
Gerard Anglès Munné, Paweł Cieśliński, Tamás Vértesi +1 more·Jul 9, 2026
Phenomena that slip beyond the grasp of our classical intuition reveal uniquely quantum effects that deepen our understanding of the physical world and enable advances in information processing, particularly in quantum communication and computation. ...
Irreducible Geometry of Higher-Order Correlator Families
Kaito Kobayashi·Jul 9, 2026
Programmable quantum simulators are beginning to access correlators of increasing complexity, ranging from four-point out-of-time-ordered correlators to even higher-order many-body correlators. The theoretical framework for interpreting such data, ho...
Hockey stick $f$-divergences
Fumio Hiai, Milán Mosonyi, Marco Tomamichel·Jul 9, 2026
In this paper we give a systematic and unified treatment and extensions of various results on a new notion of quantum $f$-divergences defined from quantum hockey stick divergences, the theory of which has been developed recently in \cite{BHT_fdiv,Hir...
Comment on "Beyond-classical computation in quantum simulation"
Wladislaw Krinitsin, Nikita Alert, Matteo Rizzi +1 more·Jul 9, 2026
A recent article [Science 388, 199-204 (2025)] investigates the applicability of numerical methods and a quantum processor unit in simulating a quantum annealing protocol. One of the findings indicates that Neural Quantum States - a versatile variati...
Approaching Carnot Efficiency at Finite Power in an Experimentally Feasible Quantum Heat Engine
Shogo Toma, Atsushi Noguchi, Ken Funo +1 more·Jul 9, 2026
Whether a heat engine can approach Carnot efficiency while maintaining finite power is a fundamental question in finite-time thermodynamics. For classical Markovian heat engines with local interactions, the power-efficiency trade-off forbids an asymp...
Robust One-Sided Device-Independent Quantum Key Distribution via High-Dimensional Steering
Monika Mothsara, Suraj Goel, Bohnishikha Ghosh +4 more·Jul 9, 2026
Quantum key distribution (QKD) brings the promise of communication with information-theoretic security but is limited in practice due to its susceptibility to noise, losses, and device imperfections. To address these challenges, we propose a robust h...
Absence of quantum advantage for approximate spin glass optimization
Dries Sels, Flaviano Morone·Jul 9, 2026
We perform a semiclassical, large-spin S, analysis of the quantum approximate optimization algorithm (QAOA) on the Sherrington-Kirkpatrick (SK) model, using the truncated Wigner approximation. Fixing the QAOA angles to their previously determined opt...
Quantifying randomness with measurement incompatibility
Sebastian Schlösser, Pauli Jokinen, Martin Plávala +3 more·Jul 9, 2026
We present a trade-off between the amount of observed measurement incompatibility and the capabilities of a classical Eavesdropper in a prepare-and-measure scenario. The result is based on a qualitative connection between measurement incompatibility ...
Low-latency FPGA-based electronic control system for fast preparation of defect-free atom arrays
Ya-Dong Hu, Dong-Qi Ma, Tian-Yang Zhang +13 more·Jul 9, 2026
The scalability of neutral atom quantum computing demands integrated electronic control systems with low latency, modular architecture, and real-time feedback capability. Here, we present an FPGA-based electronic control system that eliminates the PC...
Instability of the undecidable behavior of the spectral gap in 1D
Laura Castilla-Castellano, Angelo Lucia·Jul 9, 2026
The problem of determining the existence of a spectral gap in a lattice quantum spin system was previously shown to be undecidable for one [J. Bausch et al., "Undecidability of the spectral gap in one dimension", Physical Review X 10 (2020)] or more ...