Papers
Live trends in quantum computing research, updated daily from arXiv.
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Ferromagnetic Phase Transition of DPPH Induced by a Helical Magnetic Field
Emmanouil Markoulakis, John Chatzakis, Antonios Konstantaras +2 more·Dec 5, 2025
We report the results and unique instrument configuration of a novel experiment in which we successfully transitioned a DPPH sample from its natural paramagnetic state and essentially a non-magnetic material to a ferromagnetic state at room temperatu...
Quantum, Diplomacy, and Geopolitics
Axel Ferrazzini·Dec 5, 2025
Quantum technologies, spanning communication, sensing, computing, and cryptography, are rapidly emerging as critical paths of geopolitical competition and strategic defence innovation. Unlike traditional technological advances, quantum introduces nov...
Squeezing Classical Antiferromagnets into Quantum Spin Liquids via Global Cavity Fluctuations
Charlie-Ray Mann, Mark A. Oehlgrien, Błażej Jaworowski +4 more·Dec 5, 2025
Cavity quantum electrodynamics with atomic ensembles is typically associated with collective spin phenomena, such as superradiance and spin squeezing, in which the atoms evolve collectively as a macroscopic spin ($S\sim N/2$) on the Bloch sphere. Sur...
Sticky eigenstates in systems with sharply-divided phase space
Hua Yan·Dec 5, 2025
We investigate mixed eigenstates in systems with sharply-divided phase space, using different piecewise-linear maps whose regular-chaotic boundaries are formed by marginally unstable periodic orbits (MUPOs) or by quasi-periodic orbits. With the overl...
Heisenberg-Weyl bosonic phase spaces: emergence, constraints and quantum informational resources
Eloi Descamps, Astghik Saharyan, Arne Keller +1 more·Dec 5, 2025
Phase space quasi-probability functions provide powerful representations of quantum states and operators, as well as criteria for assessing quantum computational resources. In discrete, odd-dimensional systems (qudits), protocols involving only non-n...
Measurement-based Initial Point Smoothing and Control Approach to Quantum Memory Systems
Igor G. Vladimirov, Ian R. Petersen, Guodong Shi·Dec 5, 2025
This paper is concerned with a quantum memory system for storing quantum information in the form of its initial dynamic variables in the presence of environmental noise. In order to compensate for the deviation from the initial conditions, the classi...
A Hierarchy of Entanglement Cones via Rank-Constrained $C^*$-Convex Hulls
Mohsen Kian·Dec 5, 2025
This paper systematically investigates the geometry of fundamental quantum cones, the separable cone ($\mathscr{P}_+$) and the Positive Partial Transpose (PPT) cone ($\mathcal{P}_{\mathrm{PPT}}$), under generalized non-commutative convexity. We demon...
How to measure laser chirp rate at single-emitter excitation energies
Timothée Mounier, Moritz Kaiser, Mert Tuncel +8 more·Dec 5, 2025
We present a simple and direct method for measuring laser chirp rate, i.e., group delay dispersion (GDD) of ultrashort laser pulses at power levels compatible with single-quantum-emitter excitation. Traditional pulse characterization techniques rely ...
Quantum advantages in multiparty communication
Ankush Pandit·Dec 5, 2025
We investigate two senders and one receiver multiparty communication scenario. Following Phys.Rev.A83, 062112 and arXiv : 2506.07699, we study multiparty communication bounded by dimension and distinguishability. We provide an explicit characterizati...
Frequency-matching quantum key distribution
Hao-Tao Zhu, Yizhi Huang, Abdullah Rasmita +5 more·Dec 5, 2025
Quantum key distribution (QKD) enables information-theoretically secure communication against eavesdropping. However, phase instability remains a challenge across many QKD applications, particularly in schemes such as twin-field QKD and measurement-d...
Observability Architecture for Quantum-Centric Supercomputing Workflows
Naoki Kanazawa, Yuto Morohoshi, Hitomi Takahashi +3 more·Dec 5, 2025
Quantum-centric supercomputing (QCSC) workflows often involve hybrid classical-quantum algorithms that are inherently probabilistic and executed on remote quantum hardware, making them difficult to interpret and limiting the ability to monitor runtim...
Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
Motohiko Ezawa·Dec 5, 2025
Quantum geometry is a differential geometry based on quantum mechanics. It is related to various transport and optical properties in condensed matter physics. The Zeeman quantum geometry is a generalization of quantum geometry including the spin degr...
PERM EQ x GRAPH EQ: Equivariant Neural Networks for Quantum Molecular Learning
Saumya Biswas, Jiten Oswal·Dec 5, 2025
In hierarchal order of molecular geometry, we compare the performances of Geometric Quantum Machine Learning models. Two molecular datasets are considered: the simplistic linear shaped LiH-molecule and the trigonal pyramidal molecule NH3. Both accura...
Mechanically mediated optical-microwave quantum state transfer by feedback
Max P. Foreman, Jesse J. Slim, Warwick P. Bowen·Dec 5, 2025
State transfer between light and microwaves is a key challenge in quantum networks. Promising transducers use a mechanical intermediary that couples to both fields via radiation pressure. Such electro-optomechanical devices have achieved high efficie...
Shadow Tomography Against Adversaries
Maryam Aliakbarpour, Vladimir Braverman, Nai-Hui Chia +4 more·Dec 5, 2025
We study single-copy shadow tomography in the adversarial robust setting, where the goal is to learn the expectation values of $M$ observables $O_1, \ldots, O_M$ with $\varepsilon$ accuracy, but $γ$-fraction of the outcomes can be arbitrarily corrupt...
Concentrated Monte Carlo sampling for local observables in quantum spin chains
Wenxuan Zhang, Dingzu Wang, Dario Poletti·Dec 5, 2025
Monte Carlo methods are widely used to estimate observables in many-body quantum systems. However, conventional sampling schemes often require a large number of samples to achieve sufficient accuracy. In this work we propose the concentrated Monte Ca...
Entanglement is protected by acceleration-induced transparency in thermal field
Yongjie Pan, Baocheng Zhang, Qingyu Cai·Dec 5, 2025
The acceleration-induced transparency (AIT) effect has been suggested recently to amply the transition probability of the two-level detctor and offers a potential avenue for the experimental detection of the Unruh effect. In this paper, we explore th...
Nonlinear Classical Dynamics described by a Density Matrix in the Classical Limit
Gaspar Gonzalez, Angelo Plastino, Andrés Kowalski·Dec 5, 2025
We examine the classical limit of a fairly general nonlinear semiclassical hybrid system within a MaxEnt framework. The consistency of the hybrid dynamics requires algebraic constraints on quantum operators and smoothness conditions for the classical...
Verifier-initiated quantum message-authentication via quantum zero-knowledge proofs
Wusheng Wang, Masahito Hayashi·Dec 5, 2025
On-demand authentication is critical for scalable quantum systems, yet current approaches require the signer to initiate communication, creating unnecessary overhead. We introduce a new method where the verifier can request authentication only when n...
Microwave electrometry with quantum-limited resolutions in a Rydberg atom array
Yao-Wen Zhang, De-Sheng Xiang, Ren Liao +6 more·Dec 5, 2025
Microwave (MW) field sensing is foundational to modern technology, yet its evolution, reliant on classical antennas, is constrained by fundamental physical limits on field, temporal, and spatial resolutions. Here, we demonstrate an MW electrometry th...