Papers
Live trends in quantum computing research, updated daily from arXiv.
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Correlation functions of harmonic lattices in d-dimensional space
Masafumi Shimojo, Satoshi Ishihara, Hironobu Kataoka +2 more·Dec 22, 2025
We study the correlation functions between the dynamical variables and between their conjugate momenta at sites of a harmonic lattice in the $d$-dimensional Euclidean space. We show that at the thermodynamic limit, they can be expressed in terms of L...
Photonic variational quantum eigensolver for NISQ-compatible quantum technology
Kang-Min Hu, Min Namkung, Hyang-Tag Lim·Dec 22, 2025
Quantum computers have the potential to deliver speed-ups for solving certain important problems that are intractable for classical counterparts, making them a promising avenue for advancing modern computation. However, many quantum algorithms requir...
Quantum correlations curvature, memory functions, and fundamental bounds
Alexander Kruchkov·Dec 22, 2025
We investigate fundamental bounds on the curvature of quantum correlation functions in imaginary time. Focusing first on topological phases, we show that quantum geometry can qualitatively modify the imaginary-time decay of correlations, leading to n...
Interactions of pre- and postselected quantum particles
Gregory Reznik, Jan Dziewior, Shrobona Bagchi +1 more·Dec 21, 2025
An approach for analysis of effective interaction between pre- and postselected quantum particles is developed. It is argued that the cases of complete pre- and postselection of particles are more profound than the cases of partial pre- and postselec...
Optical perspective on the time-dependent Dirac oscillator
Thiago T. Tsutsui, Alison A. Silva, Antonio S. M. de Castro +1 more·Dec 21, 2025
The Dirac oscillator is a relativistic quantum system, characterized by its linearity in both position and momentum. Moreover, considering $(1{+}1)$ and $(2{+}1)$ dimensions, the system can be mapped onto the Jaynes-Cummings and anti-Jaynes-Cummings ...
Sufficient conditions for the Kadison--Schwarz property of unital positive maps on $M_3$
Adam Rutkowski·Dec 21, 2025
Kadison--Schwarz (KS) maps form a natural class of positive linear maps lying strictly between positivity and complete positivity. Despite their relevance in operator algebras and quantum dynamics, explicit analytic sufficient conditions for the KS p...
Making Quantum Accessible: A Seven-Category Framework for K-12 Quantum Education
Rhea Fernandez, Sarah Hagstrom, Liesel Malanos +4 more·Dec 21, 2025
We conducted a literature review and expert interviews to determine the most common methods being used to teach quantum physics and quantum computing concepts to primary and secondary students. Based on the findings of this review, we provide a frame...
Structure-Preserving Optimal Control of Open Quantum Systems via a Discrete Contact PMP
Leonardo Colombo·Dec 21, 2025
We develop a discrete Pontryagin Maximum Principle (PMP) for controlled open quantum systems governed by Lindblad dynamics, and introduce a second--order \emph{contact Lie--group variational integrator} (contact LGVI) that preserves both the CPTP (co...
Temporal nonclassicality in continuous-time quantum walks
Paolo Luppi, Claudia Benedetti, Andrea Smirne·Dec 21, 2025
We investigate the genuinely quantum features of continuous-time quantum walks by combining a single-time and a multi-time quantifier of nonclassicality. On the one hand, we consider the quantum-classical dynamical distance $D_{\mathrm{QC}}(t)$, whic...
Correlated Entropic Uncertainty as a Signature of Exceptional Points
Kyu-Won Park, Soojoon Lee, Kabgyun Jeong·Dec 21, 2025
Non-Hermitian physics has become a fundamental framework for understanding open systems where gain and loss play essential roles, with impact across photonics, quantum science, and condensed matter. While the role of complex eigenvalues is well estab...
El Agente Cuantico: Automating quantum simulations
Ignacio Gustin, Luis Mantilla Calderón, Juan B. Pérez-Sánchez +8 more·Dec 21, 2025
Quantum simulation is central to understanding and designing quantum systems across physics and chemistry. Yet it has barriers to access from both computational complexity and computational perspectives, due to the exponential growth of Hilbert space...
Dynamical Spectral Function of the Kagome Quantum Spin Liquid
Jiahang Hu, Runze Chi, Yibin Guo +3 more·Dec 21, 2025
Quantum spin liquids (QSLs) host exotic fractionalized magnetic and gauge-field excitations whose microscopic origins and experimental verification remain frustratingly elusive. In the absence of static magnetic order, the spin excitation spectrum co...
Families of $k$-positive maps and Schmidt number witnesses from generalized equiangular measurements
Katarzyna Siudzińska·Dec 21, 2025
Quantum entanglement is an important resource in many modern technologies, like quantum computation or quantum communication and information processing. Therefore, most interest is given to detect and quantify entangled states. Entanglement degree of...
Foundation Model for Unified Characterization of Optical Quantum States
Xiaoting Gao, Yan Zhu, Feng-Xiao Sun +2 more·Dec 21, 2025
Machine learning methods have been used to infer specific properties of limited families of optical quantum states, but a unified model that predicts a broad range of properties for practically relevant-especially multimode non-Gaussian-states withou...
Singularity Selector: Topological Chirality via Non-Abelian Loops around Exceptional Points
Kyu-Won Park, KyeongRo Kim, Kabgyun Jeong·Dec 21, 2025
Chirality is more than a geometric curiosity; it governs measurable asymmetries across nature, from enantiomer-selective drugs and left-handed fermions in particle physics to handed charge transport in Weyl semimetals. We extend this universal concep...
Noisy Monitored Quantum Circuits
Shuo Liu, Shao-Kai Jian, Shi-Xin Zhang·Dec 21, 2025
Noisy monitored quantum circuits have emerged as a versatile and unifying framework connecting quantum many-body physics, quantum information, and quantum computation. In this review, we provide a comprehensive overview of recent advances in understa...
Entanglement Dynamics by (Non-)Unitary Local Operator Quenches in a 2D Holographic CFT
Weibo Mao, Akihiro Miyata, Masahiro Nozaki +1 more·Dec 21, 2025
In this paper, we investigate the time evolution of entanglement entropy and mutual information for the spatially-infinite systems where we act with a primary operator on the vacuum state and then time-evolve it with the sequence of the Euclidean and...
Chaos-controlled switching between entanglement and coherence
Kyu-Won Park, Soojoon Lee, Kabgyun Jeong·Dec 21, 2025
Controlling entanglement and coherence is central to quantum information, yet the two resources often exhibit antagonistic trends and are difficult to optimize within a single platform. Here we show that chaos enables switchable eigenstate resources:...
Long-distance quantum communication sending single photons and keeping many
Stefan Häussler, Peter van Loock·Dec 21, 2025
Fiber-based classical communication is all-optical and uses light pulses reamplified and reshaped every 50-100 km in classical repeaters. Most compatible with this would be a quantum communication system which is also all-optical with quantum process...
Interplay of Confinement and Localization in a Programmable Rydberg Atom Chain
Andrea B. Rava, Jhon A. Montanez-Barrera, Kristel Michielsen +1 more·Dec 21, 2025
Analog quantum simulators promise access to complex many-body dynamics, yet their performance is ultimately set by how device imperfections compete with intrinsic physical mechanisms. Here we present an end-to-end study of correlation spreading in a ...