Papers
Live trends in quantum computing research, updated daily from arXiv.
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Explicit construction of a 2-design of ${\rm U}(2)$ from the theory of angular momentum
Rocco Maggi, Cosmo Lupo, Saverio Pascazio·Sep 21, 2025
The main aim of this work is to present an explicit construction of a 2-design of ${\rm U}(2)$, relying only on a tool that belongs to every physicists toolbox: the theory of angular momentum. Unitary designs are a rich and fundamental mathematical t...
Quantum information-cost relations and fluctuations beyond thermal environments: A thermodynamic inference approach
Yuanyuan Xiao, Jian-Hua Jiang, Junjie Liu·Sep 21, 2025
The Landauer's principle, a cornerstone of information thermodynamics, provides a fundamental lower bound on the energetic cost of information erasure in terms of the information content change. However, its traditional formulation is largely confine...
Rapid Preparation of Rydberg Superatom W State Using Superadiabatic Techniques
Liping Yang, Jiping Wang, Li Dong +2 more·Sep 21, 2025
The W state, as a robust multipartite entangled state, plays an important role in quantum information processing, quantum network construction and quantum computing. In this paper, we encode quantum information on the effective energy levels of Rydbe...
Quantum State Tomography for Tensor Networks in Two Dimensions
Zhen Qin, Zhihui Zhu·Sep 21, 2025
Recent work has shown that for one-dimensional quantum states that can be effectively approximated by matrix product operators (MPOs), a polynomial number of copies of the state suffices for reconstruction. Compared to MPOs in one dimension, projecte...
Quantum Fokker-Planck Master Equation with general signal filtering
Guilherme de Sousa·Sep 20, 2025
In this paper, we derive a general master equation for continuous feedback based on arbitrary linear signals. This result is an extension of the Quantum Fokker-Planck Master Equation derived by Annby-Andersson et al (Phys. Rev. Lett. 129, 050401) to ...
Inverse-Designed Photonic Crystal Cavities with Controllable Far-Field Numerical Aperture
Neelesh Kumar Vij, Purbita Purkayastha, Jasvith Raj Basani +1 more·Sep 20, 2025
Photonic crystal cavities confine light to subwavelength volumes, enabling strong light-matter interactions for applications in low-power photonics, opto-electronics, nonlinear optics, and quantum information. These applications demand cavities that ...
SICs, the Stabilizer Polytope and Majorization
Blake C. Stacey·Sep 20, 2025
The theory of majorization provides a unifying account of several ways in which Symmetric Informationally Complete POVMs are extremal entities.
A Collisional Model Approach to Quantum Phase Sensitivity
S. Elham Mousavigharalari, Deniz Türkpençe·Sep 20, 2025
We investigate how relative phase information, encoded by a single qubit $H\,\varphi\,H$ gate sequence, is reflected in the quantum Fisher information (QFI) under noisy dynamics. Within a collision model framework, algorithmically prepared reservoir ...
$Δ_T$ Noise as a Robust Diagnostic for Chiral, Helical and Trivial Edge Modes
Sachiraj Mishra, Colin Benjamin·Sep 20, 2025
In this article we demonstrate that $Δ_T$ noise provides a sensitive, practical probe for distinguishing chiral edge modes from topological helical and trivial (non-topological) helical edge transport. Measured under zero-current conditions, $Δ_T$ no...
Joint momenta-coordinates states as pointer states in quantum decoherence
Nomenjanahary Tanjonirina Manampisoa, Ravo Tokiniaina Ranaivoson, Roland Raboanary +3 more·Sep 20, 2025
Quantum decoherence provides a framework to study the emergence of classicality from quantum systems by showing how interactions with the environment suppress interferences and select robust states known as pointer states. Earlier studies have linked...
Structure-Fair Quantum Circuit Complexity: An Auditable Information-Theoretic Lower Bound
HongZheng Liu, YiNuo Tian, Zhiyue Wu·Sep 20, 2025
Quantifying the complexity of quantum states that possess intrinsic structure, such as symmetry or encoding, in a fair manner constitutes a core challenge in the benchmarking of quantum technologies. This paper introduces the Reference-Contingent Com...
Unital Kadison-Schwarz Maps
Hajir Al Zadjali, Farrukh Mukhamedov·Sep 19, 2025
Quantum entanglement is an important phenomenon in quantum information theory. To detect entanglement theoretically, positive but not completely positive maps are used. The Kadison-Schwarz (KS) inequality interpolates between positivity and complete ...
Classical Feedback in a Quantum Network
Elina Levi, Uzi Pereg·Sep 19, 2025
Communication over a quantum multiple access channel (MAC) is considered with classical feedback. Since the no-cloning prohibits universal copying of arbitrary quantum states, classical feedback is generated through measurement. An achievable rate re...
Entanglement asymmetry for higher and noninvertible symmetries
Francesco Benini, Pasquale Calabrese, Michele Fossati +2 more·Sep 19, 2025
Entanglement asymmetry is an observable in quantum systems, constructed using quantum-information methods, suited to detecting symmetry breaking in states -- possibly out of equilibrium -- relative to a subsystem. In this paper we define the asymmetr...
Unveiling Entanglement's Metrological Power: Empirical Modeling of Optimal States in Quantum Metrics
Volkan Erol·Sep 19, 2025
Using extensive numerical analysis of 20,000 randomly generated two-qubit states, we provide a quantitative analysis of the connection between entanglement measures and Maximized Quantum Fisher Information (MQFI). Our systematic study shows strong em...
Empty-Signal Detection and the Principle-Level Feasibility of Arbitrarily Long-Distance Repeaterless Quantum Communication
Hao Shu·Sep 19, 2025
Practical repeaterless quantum communication (PRQC) is fundamentally constrained by the divergence of the quantum bit error rate (QBER) arising from the interplay between channel loss and single-photon detector (SPD) dark counts. As the channel trans...
Task-Oriented Gaussian Optimization for Non-Gaussian Resources in Continuous-Variable Quantum Computation
Boxuan Jing, Feng-Xiao Sun, Qiongyi He·Sep 19, 2025
In continuous-variable systems, non-Gaussian resources are essential for achieving universal quantum computation that lies beyond classical simulation. Among the candidate states, the cubic phase state stands out as the simplest form of single-mode n...
Photon Blockade Mediated by Two-Photon Absorption in an Optical Parametric Amplifier
Weiyi An, Jie Zhu·Sep 19, 2025
Photon blockade (PB) is a quantum effect in strongly nonlinear systems where a single photon prevents the system from being excited to a higher level, generating anti-bunched light fields. It enables the generation of single-photon sources for quantu...
Rational Quantum Mechanics: Testing Quantum Theory with Quantum Computers
Tim Palmer·Sep 19, 2025
Motivated in part by John Wheeler's assertion that the continuum nature of Hilbert Space conceals the `it-from-bit' information-theoretic character of the quantum wavefunction, a theory of quantum physics (Rational Quantum Mechanics - RaQM) is propos...
Measurement-Driven Transitions between Area Law Phases
Hui Yu, Jiangping Hu·Sep 19, 2025
In recent years, quantum circuits consisting of unitary gates and projective measurements have become valuable tools for stimulating or preparing quantum many-body states with non-trivial properties. Here, we introduce and examine a measurement-only ...