Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Weak ergodicity breaking without nonthermal eigenstates
Boning Huang, Yongguan Ke, Li Zhang +2 more·Jul 5, 2026
The typical mechanisms of ergodicity breaking in isolated interacting quantum systems, such as many-body localization and quantum many-body scars, originate from the nonthermal nature of the underlying eigenstates. Here, in the absence of nonthermal ...
Genuine Multipartite Entanglement between Logical Qubits via Cross-Code Lattice Surgery
Alex Steiner, Tomasz Andrzejewski, Phila Rembold +8 more·Jul 5, 2026
Universal quantum computers are expected to generate arbitrary complex quantum states of logical qubits encoded in many physical qubits. This capability hinges on a fault-tolerantly implemented universal gate set, which no single quantum error-correc...
Uniform mixing and $ε$-uniform mixing on cycles
Xiwang Cao, Cuiwen Zhu·Jul 5, 2026
We study continuous-time quantum walks on cycles. We prove two complementary results. Firstly, the cycle $C_9$ does not admit uniform mixing at any time. Using the similar idea and Dickson polynomials, we prove that $C_{15}$ does not admit uniform mi...
Analytic properties of cross-click operators in passive multi-basis photodetection: monotonicity, exact convergence rates, and dimension reduction for quantum key distribution
Zhangdong Ye·Jul 5, 2026
Cross-click operators, the POVM elements for simultaneous clicks in detectors assigned to different measurement bases, are used in QKD and entanglement-verification analyses with realistic threshold detectors to bound multiphoton contributions. Earli...
Realizing Next-Nearest-Neighbor Coupling and Peierls Phase in Circuits
Xin-Sheng Zhang, Wen-Jie Xu, Hang-Yu Gu +2 more·Jul 5, 2026
We really design the trimerized circuits for the non-Hermitian one-dimensional Su-Schrieffer-Heeger models. There are three models, the initial one just considers the nearest neighbor coupling, the enhanced one is extended to contain the next-nearest...
Infrared Divergences as Itinerant Vacua
Masahiro Morikawa·Jul 5, 2026
Infrared divergences (IRDs) are usually treated as pathologies to be cancelled, regularized, or hidden in dressed asymptotic states. This paper develops a complementary and constructive viewpoint: an IRD is the signature of an \emph{itinerant vacuum}...
Circuit Design Informed Adaptive Variational Quantum Algorithms
Muhammad Umer, Dimitris G. Angelakis·Jul 5, 2026
Resource-efficient computation is of central importance in the noisy intermediate-scale quantum (NISQ) era, where decoherence, gate errors, and restricted qubit connectivity severely limit the reliable execution of quantum algorithms. In this work, w...
ML and AI for density functional theory: different priorities for Kohn-Sham and orbital-free DFT, for electronic and nuclear DFT
Xin-Hui Wu, Sergei Manzhos·Jul 5, 2026
We overview similarities and, importantly, differences in computational bottlenecks and accuracy requirements that can be addressed with machine learning (ML) and artificial intelligence (AI) techniques in electronic and nuclear DFT. From these follo...
Controlling Atom Array in an Ultra-high-cooperativity Optical Cavity
Jilai Ye, Zhihao Chi, Ye Tian +6 more·Jul 5, 2026
Neutral-atom array and cavity quantum electrodynamics offer complementary strengths for quantum science: scalable, reconfigurable qubit architectures and strong coherent light-matter coupling. Combining them in a single platform requires an optical c...
A Cross-Platform Analysis of High-Performance Quantum Error Correction Codes
Bryan Pan, Yufeng Xin·Jul 5, 2026
The theory of quantum error correction was established decades ago. Yet the limitation of the quantum computing platforms in terms of noise level and available physical qubit count persists, which greatly hinders the development of scalable quantum c...
Coherent quantum control of dark excitons in hybrid metal organic chalchogenolates
Christian L. McCoy, Tobias Saule, Mariya Aleksich +5 more·Jul 5, 2026
Artificial atom-like systems are a promising candidate for next generation quantum processing. Among them, dark excitons exhibit one of the longest lifetimes at high temperatures. Here, we demonstrate coherent control of dark excitonic states in meta...
Wei-Norman approach for non-Hermitian driven spin-$S$ systems and its application to defect freezing
Mingwei Meng, Chen Sun·Jul 5, 2026
In the theoretical study of nonequilibrium non-Hermitian systems, obtaining exact analytical solutions for their nonadiabatic dynamics is highly desirable yet often challenging. In this work, we identify a class of non-Hermitian quantum systems where...
Benchmarking API Drift in LLM-Generated Quantum Code Across Successive SDK Versions
Mohammad Arif Rasyidi, Syahirul Faiz·Jul 5, 2026
Large language models can generate plausible quantum code, but it is unclear whether they can reliably target the specific software development kit (SDK) version requested by the user. We study this problem as API drift and introduce quantum-api-drif...
The Normalised Wigner Negativity Rate as a Second-Moment Probe of Infall in AdS$_3$
Ritam Basu·Jul 5, 2026
In spread complexity, the average position of an operator along its Krylov chain, recovers the right radial momentum of an infalling particle in AdS, yet it is a measure of the first moment, irrespective of the spread of the wavepacket away from its ...
Frozen-Tree Sampling Refutes Quantum Advantage of Random Circuit Sampling
Sangchul Oh·Jul 4, 2026
Random circuit sampling of bitstrings from a Haar-random quantum state is widely believed to be classically intractable, and has therefore been implemented as a primary benchmark for demonstrating quantum advantage. Here, we challenge this premise by...
A Lie-Jordan Geometric Formulation of Lindblad Dynamics
Leonel Bixano, Victor Alberto Cruz-Barriguete, Guillermo López-Alvarez +3 more·Jul 4, 2026
We develop a Lie-Jordan geometric formulation of finite-dimensional open quantum dynamics, building on the algebraic framework introduced in our previous work (arXiv:2606.26477). The Hilbert-Schmidt operator space is endowed with an orthonormal Hermi...
Quantum simulation of gauge theories on dynamical spacetimes via Floquet-induced matrix models
Samuel Buckley-Bonanno, Noah Eckstein, Susanne F. Yelin·Jul 4, 2026
Quantum simulations of gauge theories are typically built on spatial lattices, an approach that has enabled major progress at the cost of requiring fixed background geometries and obscuring the treatment of curved and dynamical spacetimes. Large-$N$ ...
Robust self-test of the maximally entangled state of two-qubits without assuming unitary observables
Alexandre C. Orthey, Magdalena Stobińska-Moretto·Jul 4, 2026
Standard device-independent self-testing uses Naimark dilation to assume projective measurements, masking the operational limitations of realistic non-unitary observables. We establish a robust pure self-test for the singlet and Pauli observables tha...
Detection methods for optimal target reflectivity estimation with two-mode squeezed vacuum probes
Harel Radia, Tuvia Gefen, Nadav Katz·Jul 4, 2026
Target reflectivity estimation using a two-mode squeezed vacuum (TMSV) probe offers a theoretical advantage over classical schemes, but realizing this potential under the measurement constraints of microwave platforms remains a central challenge. In ...
The Delayed Stabilizer ZX-Calculus
Cole Comfort, Giovanni de Felice·Jul 4, 2026
Many stabilizer quantum error-correcting codes are built from a finite pattern repeated across space or time, such as lattice codes, translation-invariant graph states, and quantum convolutional codes. Ordinary stabilizer ZX-diagrams capture only fin...