Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Topological Dynamical Decoupling with Complete Pulse Error Cancellation
Nayden P. Nedev, Nikolay V. Vitanov·Oct 20, 2025
Systematic pulse errors remain a major obstacle to high-fidelity quantum control. We present a new family of dynamical decoupling sequences, denoted Tn, that achieve exact cancellation of pulse area errors to all orders by enforcing a simple topologi...
Synthesizing an Optimal Spin Qubit Shuttling Bus Architecture for the Surface Code
Pau Escofet, Eduard Alarcón, Sergi Abadal +4 more·Oct 20, 2025
As quantum computers scale toward millions of physical qubits, it becomes essential to robustly encode individual logical qubits to ensure fault tolerance under realistic noise. A high-quality foundational encoding allows future compilation technique...
Field-Trial Quantum Key Distribution with Qubit-Based Frame Synchronization
Rui Guan, Jingchun Yu, Zhaoyun Li +7 more·Oct 20, 2025
Quantum key distribution (QKD) is a cryptographic technique that uses quantum mechanical principles to enable secure key exchange. Practical deployment of QKD requires robust, cost-effective systems that can operate in challenging field environments....
Quantum Federated Learning: Architectural Elements and Future Directions
Siva Sai, Abhishek Sawaika, Prabhjot Singh +1 more·Oct 20, 2025
Federated learning (FL) focuses on collaborative model training without the need to move the private data silos to a central server. Despite its several benefits, the classical FL is plagued with several limitations, such as high computational power ...
Quantum Reciprocity: A Structured-Bath Hamiltonian for Coherent Amplification
Ridwan Sakidja·Oct 20, 2025
Macroscopic quantum amplifiers maintain coherence even while strongly coupled to their surroundings, demonstrating that coherence can be preserved through architecture rather than isolation. Here we derive a finite structured-bath Hamiltonian in whic...
Quantum Mechanics Relative to a Quantum Reference System: a Relative State Approach
M. J. Luo·Oct 20, 2025
This paper proposes an intrinsic or background-independent quantum framework based on entangled state rather than absolute quantum state, it describes a quantum relative state between the under-study quantum system and the quantum measuring apparatus...
A Variance-Based Convergence Criterion in Neural Variational Monte Carlo for Quantum Systems
Huan-Chen Shi, Er-Liang Cui, Dan Zhou·Oct 20, 2025
The optimization of neural wave functions in variational Monte Carlo crucially relies on a robust convergence criterion. While the energy variance is theoretically a definitive measure, its practical application as a primary convergence criterion has...
Is quantum mechanics merely a theory for us?
Peter W. Evans·Oct 20, 2025
This paper develops an agent-centric account of measurement that treats the preferred-basis problem is fundamentally perspectival. On this view, the system--apparatus--environment decomposition and the observables that are apt to become classically r...
Hardware-efficient formulation of molecular cavity-QED Hamiltonians
Francesco Troisi, Simone Latini, Heiko Appel +3 more·Oct 20, 2025
Light-matter coupled Hamiltonians are central to cavity materials engineering and polaritonic chemistry, but are challenging to simulate with classical hardware due to the scaling of the Hilbert space with the number of quantum photon modes and matte...
Detector Asymmetry in Continuous Variable Quantum Key Distribution
Jennifer O Bartlett, Alfie J Myers Wilson, Christopher J Chunnilall +1 more·Oct 20, 2025
In Local-local Oscillator (LLO) based Continuous-Variable Quantum Key Distribution (CV-QKD), the phase reference of the transmitter and receiver, Alice and Bob, are naturally de-correlated due to their use of individual lasers. A phase reference sign...
Geometry-Driven Charge and Spin Transport in $\beta12$ Borophene Quantum Dots
Seyed Mahdi Mastoor, Amirhossein Ahmadkhan Kordbacheh·Oct 20, 2025
Theoretical research has been conducted to study how geometry affects charge and spin transport in $β\mathrm{12}$ borophene quantum dots, which are confined systems. The study examined two distinct central regions, which included a circular disc and ...
A Compressive Sensing Inspired Monte-Carlo Method for Combinatorial Optimization
Baptiste Chevalier, Shimpei Yamaguchi, Wojciech Roga +1 more·Oct 20, 2025
In this paper, we present the Monte-Carlo Compressive Optimization algorithm, a new method to solve a combinatorial optimization problem that is assumed compressible. The method relies on random queries to the objective function in order to estimate ...
Non-abelian thermal gauge potentials for high spin cold atom gases
Zheng-Chuan Wang·Oct 20, 2025
On the basis of the non-equilibrium Green function formalism, we derived a spinor Boltzmann equation for the Bose cold atom gases with high spin, which is achieved by a quantum Wigner transformation on the equation satisfied by the lesser Green funct...
Phase estimation via photon subtraction at the output of the hybrid interferometer
Qisi Zhou, Tao Jiang, Qingqian Kang +4 more·Oct 20, 2025
The hybrid interferometer integrating an optical parametric amplifier and a beam splitter has the potential to outperform the SU(1,1) interferometer. However, photon loss remains a critical limitation for practical implementation. To address this cha...
Tagged vector space, Part I: Dirac notation as originally intended
Filippus S. Roux·Oct 20, 2025
A generalization is provided for the notion of tags, as used in various formulations of physical scenarios. It leads to the definition of tagged vector spaces, based on a set of axioms for tags and their extractors. As an application, such a tagged v...
Entanglement Sum Rule from Higher-Form Symmetries
Pei-Yao Liu·Oct 20, 2025
We prove an entanglement sum rule for $(d-1)$-dimensional quantum lattice models with finite abelian higher-form symmetries, obtained by minimally coupling a sector on $p$-simplices carrying a $p$-form $G$ symmetry to a sector on $(p+1)$-simplices ca...
Trapped-ion two-qubit gates with >99.99% fidelity without ground-state cooling
A. C. Hughes, R. Srinivas, C. M. Löschnauer +6 more·Oct 20, 2025
We introduce the 'smooth gate', an entangling method for trapped-ion qubits where residual spin-motion entanglement errors are adiabatically eliminated by ramping the gate detuning. We demonstrate electronically controlled two-qubit gates with an est...
Long-distance distribution of atom-photon entanglement based on a cavity-free cold atomic ensemble
Tian-Yu Wang, Ren-Hui Chen, Yan Li +10 more·Oct 20, 2025
Constructing a quantum memory node with the ability of long-distance atom-photon distribution is the essential task for future quantum networks, enabling distributed quantum computing, quantum cryptography and remote sensing. Here we report the demon...
Non-stabilizerness as a Diagnostic of Criticality and Exceptional Points in Non-Hermitian Spin Chains
Cătălin Paşcu Moca, Doru Sticlet, Balázs Dóra·Oct 20, 2025
We investigate non-stabilizerness, also known as ``magic,'' to understand criticality and exceptional points in non-Hermitian quantum many-body systems. Our focus is on parity-time ($\mathcal{PT}$) symmetric spin chains, specifically the non-Hermitia...
Error-correcting codes and absolutely maximally entangled states for mixed dimensional Hilbert spaces
Simeon Ball, Raven Zhang·Oct 20, 2025
A major difficulty in quantum computation is the ability to implement fault tolerant computations, protecting information against undesired interactions with the environment. Stabiliser codes were introduced as a means to protect information when sto...