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Live trends in quantum computing research, updated daily from arXiv.
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Quantum Advantage in Learning Mixed Unitary Channels
Yue Tu, Liang Jiang·Nov 17, 2025
We study the task of learning mixed unitary channels using Fisher information, under different quantum resource assumptions including ancilla and concatenation. Our result shows that the asymptotic sample complexity scales as $\frac{r}{d\varepsilon^2...
Architectural Approaches to Fault-Tolerant Distributed Quantum Computing and Their Entanglement Overheads
Nitish Kumar Chandra, Eneet Kaur, Kaushik P. Seshadreesan·Nov 17, 2025
Fault tolerant quantum computation over distributed quantum computing (DQC) platforms requires careful evaluation of resource requirements and noise thresholds. As quantum hardware advances toward modular and networked architectures, various fault to...
High-Efficiency Three-Stroke Quantum Isochoric Heat Engine: From Infinite Potential Wells to Magic Angle Twisted Bilayer Graphene
Hadi Mohammed Soufy, Colin Benjamin·Nov 17, 2025
We introduce a three-stroke quantum isochoric cycle that functions as a heat engine operating between two thermal reservoirs. Implemented for a particle confined in a one-dimensional infinite potential well, the cycle's performance is benchmarked aga...
Modeling Quantum Noise in Nanolasers using Markov Chains
Matias Bundgaard-Nielsen, Gian Luca Lippi, Jesper Mørk·Nov 17, 2025
The random nature of spontaneous emission leads to unavoidable fluctuations in a laser's output. This is often included through random Langevin forces in laser rate equations, but this approach falls short for nanolasers. In this paper, we show that ...
Long-range entanglement and quantum correlations in a multi-frequency comb system
Sahil Pontula, Debasmita Banerjee, Marin Soljacic +1 more·Nov 17, 2025
Frequency combs are multimode photonic systems that underlie countless precision sensing and metrology applications. Since their invention over two decades ago, numerous efforts have pushed frequency combs to broader bandwidths and more stable operat...
Thermodynamics of the Fermi-Hubbard Model through Stochastic Calculus and Girsanov Transformation
Detlef Lehmann·Nov 17, 2025
We apply the methodology of our recent paper 'The Dynamics of the Hubbard Model through Stochastic Calculus and Girsanov Transformation' [1] to thermodynamic correlation functions in the Fermi-Hubbard model. They can be obtained from a stochastic dif...
Density of reflection resonances in one-dimensional disordered Schrödinger operators
Yan V. Fyodorov, Jan Meibohm·Nov 17, 2025
We develop an analytic approach to evaluating the density $ρ({\cal E},Γ)$ of complex resonance poles with real energies $\mathcal{E}$ and widths $Γ$ in the pure reflection problem from a one-dimensional disordered sample with white-noise random poten...
Qudit-native simulation of the Potts model
Maksim A. Gavreev, Evgeniy O. Kiktenko, Aleksey K. Fedorov +1 more·Nov 17, 2025
Simulating entangled, many-body quantum systems is notoriously hard, especially in the case of high-dimensional nature of physical underlying objects. In this work, we propose an approach for simulating the Potts model based on the Suzuki-Trotter dec...
Sequences of Bivariate Bicycle Codes from Covering Graphs
Benjamin C. B. Symons, Abhishek Rajput, Dan E. Browne·Nov 17, 2025
We show that given an instance of a bivariate bicycle (BB) code, it is possible to generate an infinite sequence of new BB codes using increasingly large covering graphs of the original code's Tanner graph. When a BB code has a Tanner graph that is a...
Measurement-based Dynamical Decoupling for Fidelity Preservation on Large-scale Quantum Processors
Jeongwoo Jae, Changwon Lee, Juzar Thingna +2 more·Nov 17, 2025
Dynamical decoupling (DD) is a key technique for suppressing decoherence and preserving the performance of quantum algorithms. We introduce a measurement-based DD (MDD) protocol that determines control unitary gates from partial measurements of noisy...
Simultaneous variances of Pauli strings, weighted independence numbers, and a new kind of perfection of graphs
Zhen-Peng Xu, Jie Wang, Qi Ye +3 more·Nov 17, 2025
A set of Pauli stings is well characterized by the graph that encodes its commutatitivity structure, i.e., by its frustration graph. This graph provides a natural interface between graph theory and quantum information, which we explore in this work. ...
Towards Quantum Software for Quantum Simulation
Maja Franz, Lukas Schmidbauer, Joshua Ammermann +2 more·Nov 17, 2025
Quantum simulation is a leading candidate for demonstrating practical quantum advantage over classical computation, as it is believed to provide exponentially more compute power than any classical system. It offers new means of studying the behaviour...
Quantum Machine Learning via Contrastive Training
Liudmila A. Zhukas, Vivian Ni Zhang, Qiang Miao +5 more·Nov 17, 2025
Quantum machine learning (QML) has attracted growing interest with the rapid parallel advances in large-scale classical machine learning and quantum technologies. Similar to classical machine learning, QML models also face challenges arising from the...
Spin-Adapted Fermionic Unitaries: From Lie Algebras to Compact Quantum Circuits
Ilias Magoulas, Francesco A. Evangelista·Nov 17, 2025
Conservation of symmetries plays a crucial role in both classical and quantum simulations of many-body systems, enabling the tracking of states with specific symmetry properties and leading to substantial reductions in the number of optimization para...
Extracting Photon-Number Information from Superconducting Nanowire Single-Photon Detectors Traces via Mean-Derivative Projection
I. S. Kuijf, F. B. Baalbergen, L. Seldenthuis +2 more·Nov 17, 2025
Photon-number resolved detection with superconducting nanowire single-photon detectors (SNSPDs) attracts increasing interest, but lacks a systematic framework for interpreting and benchmarking this capability. In this work, we combine principal compo...
Probing parameters estimation with Gaussian non-commutative measurements
Alice P. G. Hall, Carlos H. S. Vieira, Jonas F. G. Santos·Nov 17, 2025
Gaussian quantum states and channels are pivotal across many branches of quantum science and their applications, including the processing and storage of quantum information, the investigation of thermodynamics in the quantum regime, and quantum compu...
Emulation of the Six-State Quantum Key Distribution Protocol with Pulsed Lasers
Sara P. Gandelman, Georgi Gary Rozenman·Nov 17, 2025
Quantum cryptography remains a topic of enduring scientific and educational interest. Here, we present a clear and accessible framework for exploring the six-state quantum key distribution protocol, an enhanced three-basis extension of the BB84 schem...
On the Optimal Rate of Convergence for Translation-Invariant 1D Quantum Walks
Benjamin Hinrichs, Pascal Mittenbühler·Nov 17, 2025
We study the convergence rate of translation-invariant discrete-time quantum dynamics on a one-dimensional lattice. We prove that the cumulative distributions function of the ballistically scaled position $X(n)/{n}$ after $n$ steps converges at a rat...
Taming Barren Plateaus in Arbitrary Parameterized Quantum Circuits without Sacrificing Expressibility
Zhenyu Chen, Yuguo Shao, Zhengwei Liu +1 more·Nov 17, 2025
Quantum algorithms based on parameterized quantum circuits (PQCs) have enabled a wide range of applications on near-term quantum devices. However, existing PQC architectures face several challenges, among which the ``barren plateaus" phenomenon is pa...
Diffraction induced quantum chaos in a one-dimensional Bose gas
M. Olshanii, G. Aupetit-Diallo, S. G. Jackson +2 more·Nov 17, 2025
We investigate the Lieb--Liniger model of interacting one-dimensional bosons coupled to a localized impurity, modeled by a delta barrier. While the Lieb--Liniger gas is integrable, the impurity breaks integrability and induces a transition towards qu...