Papers
Live trends in quantum computing research, updated daily from arXiv.
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Symmetry-Preserving Variational Quantum Simulation of the Heisenberg Spin Chain on Noisy Quantum Hardware
Rudraksh Sharma·Dec 28, 2025
Variational quantum algorithms are among the most promising approaches for simulating interacting quantum many-body systems on noisy intermediate-scale quantum (NISQ) devices. However, the practical success of variational quantum eigensolvers (VQE) c...
Graph restricted tensors: building blocks for holographic networks
Rafaĺ Bistroń, Márton Mestyán, Balázs Pozsgay +1 more·Dec 28, 2025
We analyze few-body quantum states with particular correlation properties imposed by the requirement of maximal bipartite entanglement for selected partitions of the system into two complementary parts. A novel framework to treat this problem by enco...
Fast chiral resolution with optimal control
Dionisis Stefanatos, Ioannis Thanopulos, Emmanuel Paspalakis·Dec 28, 2025
In this work, we formulate the problem of achieving in minimum-time perfect chiral resolution with bounded control fields, as an optimal control problem on two non-interacting spins-$1/2$. We assume the same control bound for the two Raman fields (pu...
Generalised Entanglement Entropies from Unit-Invariant Singular Value Decomposition
Pawel Caputa, Abhigyan Saha, Piotr Sułkowski·Dec 28, 2025
We introduce generalisations of von Neumann entanglement entropy that are invariant with respect to certain scale transformations. These constructions are based on the Unit-Invariant Singular Value Decomposition (UISVD) in its left-, right-, and bi-i...
Aliphatic Chains as One-Dimensional XY Spin Chains
Kirill F. Sheberstov·Dec 28, 2025
Spin waves are propagating disturbances of spin order in lattices with nearest-neighbor interactions. They are traditionally observed in magnetically ordered solids using inelastic neutron, light, or electron scattering, and ferromagnetic resonance. ...
Comment on "There is No Quantum World" by Jeffrey Bub
Philippe Grangier·Dec 28, 2025
In a recent preprint [1] Jeffrey Bub presents a discussion of neo-Bohrian interpretations of quantum mechanics, and also of von Neumann's work on infinite tensor products [2]. He rightfully writes that this work provides a theoretical framework that ...
Revisiting finite Abelian hidden subgroup problem and its distributed exact quantum algorithm
Ziyuan Dong, Xiang Fan, Tengxun Zhong +1 more·Dec 28, 2025
We revisit the finite Abelian hidden subgroup problem (AHSP) from a mathematical perspective and make the following contributions. First, by employing amplitude amplification, we present an exact quantum algorithm for the finite AHSP, our algorithm i...
Effective Kinetic Monte Carlo for a Quantum Epidemic Process
Alexander Sturges, Hugo Smith, Matteo Marcuzzi·Dec 28, 2025
Inspired by previous works on epidemic-like processes in open quantum systems, we derive an elementary quantum epidemic model that is simple enough to be studied via Quantum Jump Monte Carlo simulations at reasonably large system sizes. We show how s...
Random matrix prediction of average entanglement entropy in non-Abelian symmetry sectors
Anwesha Chakraborty, Lucas Hackl, Mario Kieburg·Dec 28, 2025
We study the average bipartite entanglement entropy of Haar-random pure states in quantum many-body systems with global $\mathrm{SU}(2)$ symmetry, constrained to fixed total spin $J$ and magnetization $J_z = 0$. Focusing on spin-$\tfrac12$ lattices a...
Multiverse: A Simulator for Evaluating Entanglement Routing in Quantum Networks
Amar Abane, Junxiao Shi, Van Sy Mai +2 more·Dec 28, 2025
We present MQNS, a discrete-event simulator for rapid evaluation of entanglement routing under dynamic, heterogeneous configurations. MQNS supports runtime-configurable purification, swapping, memory management, and routing, within a unified qubit li...
Gauge Symmetry in Quantum Simulation
Masanori Hanada, Shunji Matsuura, Andreas Schafer +1 more·Dec 28, 2025
Quantum simulation of non-Abelian gauge theories requires careful handling of gauge redundancy. We address this challenge by presenting universal principles for treating gauge symmetry that apply to any quantum simulation approach, clarifying that ph...
Controlling Nonadiabatic Transitions Through Engineered Ultrafast Laser Fields at Conical Intersections
Xuanchao Zhang, Yang-Cheng Ye, Panpan Zhang +5 more·Dec 28, 2025
In this paper, we investigate coherent control of nonadiabatic dynamics at a conical intersection (CI) using engineered ultrafast laser pulses. Within a model vibronic system, we tailor pulse chirp and temporal profile and compute the resulting wave-...
Quantum batteries with K-regular graph generators: A no-go for quantum advantage
Debkanta Ghosh, Tanoy Kanti Konar, Amit Kumar Pal +1 more·Dec 28, 2025
Regular graphs find broad applications ranging from quantum communication to quantum computation. Motivated by this, we investigate the design of a quantum battery based on a K-regular graph, where K denotes the number of edges incident on each verte...
Energy transport in the Schrödinger plate
Serge N. Gavrilov, Anton M. Krivtsov, Ekaterina V. Shishkina·Dec 28, 2025
In this paper, we introduce "the Schrödinger plate." This is an infinite two-dimensional linear micro-polar elastic medium, with out-of-plane degrees of freedom, lying on a linear elastic foundation of a special kind. Any free motion of the plate can...
Error Resilience of Fracton Codes and Near Saturation of Code-Capacity Threshold in Three Dimensions
Giovanni Canossa, Lode Pollet, Miguel A. Martin-Delgado +2 more·Dec 28, 2025
Fracton codes have been intensively studied as novel topological states of matter, yet their fault-tolerant properties remain largely unexplored. Here, we investigate the optimal thresholds of self-dual fracton codes, in particular the checkerboard c...
Agency under indefinite causality: operational eternalism in higher-order quantum theory
Alexei Grinbaum·Dec 28, 2025
After two decades of research on indefinite causality, a philosophical lesson emerges: the tension between operational quantum theory and dynamical spacetime physics is unbridgeable if one believes both types of theories to be fundamental. We interpr...
Any DOF All at Once: Single Photon State Tomography in a Single Measurement Setup
Roey Shafran, Ron Ziv, Mordechai Segev·Dec 28, 2025
Photonic quantum technologies utilize various degrees of freedom (DOFs) of light, such as polarization, frequency, and spatial modes, to encode quantum information. In the effort of further improving channel capacity and increasing the complexity of ...
A Counterexample to the Optimality Conjecture in Convex Quantum Channel Optimization
Jianting Yang·Dec 28, 2025
This paper presents a counterexample to the optimality conjecture in convex quantum channel optimization proposed by Coutts et al. The conjecture posits that for nuclear norm minimization problems in quantum channel optimization, the dual certificate...
Benchmarking Lie-Algebraic Pretraining and Non-Variational QWOA for the MaxCut Problem
Matthaus Zering, Jolyon Joyce, Tal Gurfinkel +1 more·Dec 28, 2025
The Quantum Approximate Optimization Algorithm (QAOA) is a leading candidate for achieving quantum advantage in combinatorial optimization on Near-Term Intermediate-Scale Quantum (NISQ) devices. However, random initialization of the variational param...
Bell nonlocality and entanglement in $χ_{cJ}$ decays into baryon pair
PengCheng Hong, RongGang Ping, WeiMin Song·Dec 28, 2025
We present a systematic analysis of Bell nonlocality and entanglement in $χ_{cJ}$($J=0,1,2$) decays into baryon pair($B\bar{B}$), with particular emphasis on their production via the process $e^+e^- \to ψ(2S) \to γχ_{cJ}$ at BESIII. From the baryon-a...