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Live trends in quantum computing research, updated daily from arXiv.
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Witnessing the Effective Entanglement in the COW Protocol
F. Rezazadeh, A. Mani, M. Khodabandeh +2 more·Dec 1, 2025
We present a rigorous mathematical framework for verifying effective entanglement in a Coherent One-Way (COW) quantum key distribution setup. In particular, we introduce a two-parameter family of entanglement witnesses, identify the parameter ranges ...
Quantum state preparation and transfer based on the bound state in the doublon continuum
Xiaojun Zhang, Xiang Guo, Yan Zhang +2 more·Dec 1, 2025
Bound states in the continuum (BICs) have attracted intense interest, yet their many-particle counterparts remain largely unexplored in waveguide quantum electrodynamics. We identify and characterize a bound state embedded in the doublon continuum (B...
Long nuclear spin coherence times for molecules trapped in high-purity solid parahydrogen
Alexandar P. Rollings, Jonathan D. Weinstein·Dec 1, 2025
We measure the ensemble transverse relaxation time (T2*) and spin-echo coherence time (T2) of the proton spin of HD molecules trapped in solid parahydrogen. By using high-purity parahydrogen matrices, we are able to measure significantly longer T2 an...
From Device to Dynamics: An Iterative Architectural Framework for High-Performance Single-Photon Detection at Room Temperature
Hao Shu·Dec 1, 2025
Photon detection is a cornerstone of quantum technology, traditionally regarded as a static device-level operation constrained by the intrinsic physical properties of single-photon detectors (SPDs). Consequently, high-performance detection has been h...
Measurement-based quantum computation on weighted graph states with arbitrarily small weight
Tomohiro Yamazaki, Yuki Takeuchi·Dec 1, 2025
Weighted graph states are a natural generalization of graph states, which are generated by applying controlled-phase gates, instead of controlled-Z gates, to a separable state. In this paper, we show that uniformly weighted graph states on a suitable...
Data-Driven Learnability Transition of Measurement-Induced Entanglement
Dongheng Qian, Jing Wang·Dec 1, 2025
Measurement-induced entanglement (MIE) captures how local measurements generate long-range quantum correlations and drive dynamical phase transitions in many-body systems. Yet estimating MIE experimentally remains challenging: direct evaluation requi...
Higher-order spectral form factors of circular unitary ensemble
Sohail, Youyi Huang, Lu Wei·Dec 1, 2025
Spectral form factor (SFF), one of the key quantity from random matrix theory, serves as an important tool to probe universality in disordered quantum systems and quantum chaos. In this work, we present exact closed-form expressions for the second- a...
Programmable Switching of Molecular Transitions via Plasmonic Toroidal Nanoantennae
Arda Gulucu, Emre Ozan Polat·Dec 1, 2025
The ability to switch and program molecular transitions via deterministically located plasmonic nanoantennae presents opportunities for wide spectrum of applications from biosensors to quantum computing. Due to its topology, toroidal nanoantenna (TNA...
Inductive van der Waals Force between Two Quantum Loops
Kicheon Kang·Dec 1, 2025
We study the van der Waals-London force, which is typically associated with fluctuating dipoles in atoms, in a mesoscopic circuit consisting of two inductively coupled superconducting loops. We investigate the ``inductive" van der Waals-London intera...
Tunable Single- and Multiphoton Bundles in Cavity-Coupled Atomic Arrays
Geng Zhao, Yun Chen, Jiayuang Zhang +2 more·Dec 1, 2025
We propose an experimentally accessible scheme for realizing tunable nonclassical light in cavity-coupled reconfigurable atomic arrays. By coherently controlling the collective interference phase, the system switches from single-photon blockade to hi...
Geometric Phase of the Two-Particle Bethe Wavefunction
V. A. Tomilin, A. M. Rostom, L. V. Il'ichov·Dec 1, 2025
We consider a problem of geometric phase generation in a system of two interacting bosons confined in a narrow ring potential with a localized defect. Geometric phase emerges from variation of parameters of the defect. Particle interaction is taken i...
The Entropy Flow of a Laser Beam
Howard M. Wiseman·Dec 1, 2025
A laser beam is often modelled by a pure coherent state. In fact its state is mixed, even if it has coherent-state photon-number statistics (Poissonian), because the phase must vary. We consider such an ideal laser beam, with phase diffusion rate $\e...
Passive Polarization Stabilization for Practical and Robust Entanglement Distribution
Jin-Woo Kim, Minchul Kim, Jiho Park +1 more·Dec 1, 2025
Quantum entanglement is a key resource in quantum information science, playing an essential role in quantum key distribution (QKD), quantum networks, and distributed quantum computing. However, practical applications require techniques capable of rel...
Experimental Witness of Quantum Jump Induced High-Order Liouvillian Exceptional Points
Zhuo-Zhu Wu, Pei-Dong Li, Tai-Hao Cui +11 more·Dec 1, 2025
The exceptional point has presented considerably interesting and counterintuitive phenomena associated with nonreciprocity, precision measurement, and topological dynamics. The Liouvillian exceptional point (LEP), involving the interplay of energy lo...
Quantum Chromatic Number of Subgraphs of Orthogonality Graphs and the Distance-2 Hamming Graph
Tao Luo, Yu Ning, Xiande Zhang·Dec 1, 2025
The determination of the quantum chromatic number of graphs has attracted considerable attention recently. However, there are few families of graphs whose quantum chromatic numbers are determined. A notable exception is the family of orthogonality gr...
Scoring-based Static Variable Ordering for Decision Diagram-based Quantum Circuit Simulation
Yusuke Kimura, Masahiro Fujita, Robert Wille·Dec 1, 2025
Decision diagram (DD)-based quantum circuit simulators represent quantum states and gates using DDs, enabling memory-efficient and fast simulations for some quantum circuits like Shor. Although it is known that DD size and processing time vary depend...
From Betti Numbers to Persistence Diagrams: A Hybrid Quantum Algorithm for Topological Data Analysis
Dong Liu·Dec 1, 2025
Persistence diagrams serve as a core tool in topological data analysis, playing a crucial role in pathological monitoring, drug discovery, and materials design. However, existing quantum topological algorithms, such as the LGZ algorithm, can only eff...
Spatial structure and magnetism of a spin-orbit entangled spin-1 coherent spin center: the manganese neutral acceptor in a III-V semiconductor
Julian Zanon, Michael E. Flatté·Dec 1, 2025
A Mn dopant in a III-V semiconductor produces a highly-entangled, coherent triplet ground state not fully captured by single-determinant theories of electron structure. We directly construct an analytic form for its ground-state wavefunction, finding...
QAISim: a toolkit for modeling and simulation of AI in quantum cloud computing environments
Irwindeep Singh, S. Gill, Jinzhao Sun +1 more·Dec 1, 2025
Quantum computing offers new ways to explore the theory of computation via the laws of quantum mechanics. Due to the rising demand for quantum computing resources, there is growing interest in developing cloud-based quantum resource sharing platforms...
Quantum magnetic imaging of current density in lithium-ion batteries
W. Evans, T. Coussens, M. T. M. Woodley +7 more·Nov 30, 2025
The projected rapid growth of battery cell production over the next decade demands advanced diagnostic tools for quality control, ageing prediction, and recycling. Most existing techniques lack the spatial and temporal resolution required to capture ...