quant-ph papers | Gist.Science

Quantifying Quantum Computational Advantage on a Processor of Ultracold Atoms

Using a quantum gas microscope to manipulate ultracold atoms in driven Bose-Hubbard chains and ladders, the authors demonstrate a practical quantum computational advantage by sampling thermalized many-body states with a Hilbert space dimension of $10^{19}$ at a rate three orders of magnitude faster than classical supercomputers, while validating the system's chaotic nature through volume-law entanglement and high-order correlation measurements.

Yong-Guang Zheng, Ying-Chao Shen, Wei-Yong Zhang, An Luo, Ying Liu, Ming-Gen He, Hao-Ran Zhang, Wan Lin, Han-Yi Wang, Zi-Hang Zhu, Pei-Yue Qiu, Tian-Yi Wang, Ming-Cheng Chen, Chao-Yang Lu, Supanut Thanasilp, Dimitris G. Angelakis, Zhen-Sheng Yuan, Jian-Wei Pan2026-04-14🔬 cond-mat

Performance Analysis of Satellite-Based QKD Protocols

This paper analyzes the performance of four satellite-based QKD protocols (BB84, B92, BBM92, and E91) over low Earth orbit links, demonstrating that downlink configurations generally outperform uplinks and that BB84 and BBM92 achieve higher secure key rates than their counterparts under various atmospheric and operational conditions.

Muskan, Ramniwas Meena, Subhashish Banerjee2026-04-14⚛️ quant-ph

Generic ETH: Eigenstate Thermalization beyond the Microcanonical

This paper extends the Eigenstate Thermalization Hypothesis beyond its traditional microcanonical limits by demonstrating "generic ETH" in a qutrit lattice system with conserved quasilocal charge, where thermalization signatures persist even in states far outside standard energy and charge windows.

Elena Cáceres, Stefan Eccles, Jason Pollack, Sarah Racz2026-04-14⚛️ quant-ph

Genuinely nonlocal sets with smallest cardinality

This paper establishes the existence of genuinely nonlocal sets with the smallest possible cardinality, demonstrating that three pure states suffice in arbitrary N-partite systems and even two mixed states are sufficient, thereby providing new examples of strongly nonlocal sets and highlighting the role of genuine entanglement in hindering local access to multipartite quantum information.

Zong-Xing Xiong, Mao-Sheng Li, Bing Yu, Zhu-Jun Zheng, Lvzhou Li2026-04-14⚛️ quant-ph

Elevating Variational Quantum Semidefinite Programs for Polynomial Objectives

This paper introduces Product-State Lifting (PSL), a resource-efficient encoding method that upgrades variational quantum semidefinite programs to solve general $k$ -degree polynomial optimization problems with only a linear increase in resources, thereby overcoming the scalability limitations of classical relaxations.

Iria W. Wang, Robin Brown, Taylor L. Patti, Anima Anandkumar, Marco Pavone, Susanne F. Yelin2026-04-14⚛️ quant-ph

A stable phase-locking-free single beam optical lattice with multiple configurations

This paper presents a stable, phase-locking-free method for generating optical lattices by passing a single laser beam through a prism with n-fold symmetric facets, successfully demonstrating various configurations like triangular and ten-fold quasi-crystal lattices with minimal lattice constant variation and positional drift.

Yirong Wang, Xiaoyu Dai, Xue Zhao, Guangren Sun, Kuiyi Gao, Wei Zhang2026-04-14🔬 physics.atom-ph

Large Language Models Can Help Mitigate Barren Plateaus in Quantum Neural Networks

This paper proposes AdaInit, a novel framework that leverages large language models with submartingale properties to iteratively synthesize adaptive initial parameters for Quantum Neural Networks, thereby effectively mitigating barren plateaus and ensuring higher gradient variance across various scales.

Jun Zhuang, Chaowen Guan2026-04-14⚛️ quant-ph

Quantum stick-slip motion in nanoscaled friction

This paper investigates the quantum mechanical version of the Prandtl-Tomlinson model for nanoscale friction, revealing that Landau-Zener tunneling significantly reduces frictional dissipation compared to classical motion and providing guidelines for interpreting experimental data by analyzing the interplay between velocity, interaction strength, and temperature.

Dai-Nam Le, Pablo Rodriguez-Lopez, Lilia M. Woods2026-04-14🔬 cond-mat.mes-hall

Driven Magnon-Photon System as a Tunable Quantum Heat Rectifier

This paper demonstrates that an asymmetrically driven hybrid magnon-photon system can function as a highly tunable quantum heat rectifier, where strong external driving of the magnonic subsystem in the weak hybridization regime enables precise control over both the magnitude and direction of thermal currents.

C. O. Edet, K. Słowik, N. Ali, M. Asjad, O. Abah2026-04-14🔬 cond-mat.mes-hall

Conditions for Unitarity in Timeless Quantum Theory

This paper establishes the necessary and sufficient conditions for unitary relative dynamics in timeless quantum theory, demonstrating that such evolution occurs if and only if the clock's rate remains constant in time and independent of its internal structure.

Simone Rijavec2026-04-14⚛️ quant-ph

Improved Strategies for Fermionic Quantum Simulation with Global Interactions

This paper introduces efficient quantum circuits for fermionic excitation operators on ion trap quantum computers that leverage the global Mølmer-Sørensen interaction to achieve optimal parallelism, reducing gate counts by factors of 2 and 4 for single and double excitations respectively, thereby significantly improving speed and error performance.

Thierry N. Kaldenbach, Erik Schultheis, Niklas Stewen, Gabriel Breuil2026-04-14🔬 cond-mat.mtrl-sci

Locality Implies Complex Numbers in Quantum Mechanics

The paper demonstrates that under the independent source assumption, real-number quantum theories are equivalent to complex-number quantum theory only if they incorporate nonlocal hidden degrees of freedom, suggesting that complex numbers are essential for describing entanglement between independent systems.

Tianfeng Feng, Changliang Ren, Vlatko Vedral2026-04-14⚛️ quant-ph

Quantum Cramer-Rao Precision Limit of Noisy Continuous Sensing

This paper introduces a numerically efficient method to calculate the quantum Cramer-Rao bound for continuously monitored quantum sensors under general Markovian and non-Markovian environmental noise, providing a rigorous framework to assess and optimize sensor performance for both constant-parameter and waveform estimation.

Dayou Yang, Moulik Ketkar, Koenraad Audenaert, Susana F. Huelga, Martin B. Plenio2026-04-14⚛️ quant-ph

Optimizing Resource Allocation in a Distributed Quantum Computing Cloud: A Game-Theoretic Approach

This paper proposes a game-theoretic framework, specifically the QC-PRAGM and QC-PRAGM++ models, to optimize resource allocation in distributed quantum computing clouds by partitioning quantum circuits to minimize client costs and inter-node communication while maximizing resource utilization.

Bernard Ousmane Sane, Michal Hajdušek, Rodney Van Meter2026-04-14⚛️ quant-ph

Subjective nature of path information in quantum mechanics

This paper challenges classical intuition by demonstrating through a three-source quantum experiment that the assignment of a definite physical origin to a particle is subjective, even when full path information is available and interference visibility is zero.

Xinhe Jiang, Armin Hochrainer, Jaroslav Kysela, Manuel Erhard, Xuemei Gu, Ya Yu, Anton Zeilinger2026-04-14🔬 physics.optics

Security of deterministic key distribution with higher-dimensional systems

This paper analyzes the security of a two-way quantum key distribution protocol using arbitrary finite-dimensional systems and Heisenberg-Weyl operators, demonstrating that increasing the system dimension enhances robustness against both individual and collective eavesdropping attacks while outperforming entangled two-way secure dense coding protocols under various noise conditions.

Abhishek Muhuri, Ayan Patra, Rivu Gupta, Tamoghna Das, Aditi Sen De2026-04-14⚛️ quant-ph

Computational Complexity and Simulability of Non-Hermitian Quantum Dynamics

This paper demonstrates that scalable non-Hermitian quantum computation is unlikely to offer a practical advantage because its ability to implement postselection renders it as powerful as the intractable complexity class PP, whereas non-Hermitian systems derived from classically simulable unitary families remain efficiently simulable provided postselection events occur with non-negligible probability.

Brian Barch, Daniel Lidar2026-04-14⚛️ quant-ph

Accelerated Inchworm Method with Tensor-Train Bath Influence Functional

This paper proposes an efficient, deterministic algorithm that accelerates the inchworm method for simulating open quantum systems by approximating the bath influence functional as a tensor train, thereby achieving linear scaling with dimensionality and enabling accurate long-time dynamics simulations.

Geshuo Wang, Yixiao Sun, Siyao Yang, Zhenning Cai2026-04-14⚛️ quant-ph

Heralded enhancement in quantum state discrimination

This paper demonstrates that while partial post-selection via local operations and classical communication cannot improve the average error probability for discriminating two unknown non-orthogonal pure states, it can strictly enhance discrimination performance within specific post-selected ensembles.

Qipeng Qian, Christos N. Gagatsos2026-04-14⚛️ quant-ph

Classical-quantum gravity as quantum gravity in disguise

This paper demonstrates that classical-quantum gravity theories based on completely positive dynamics can be embedded into a fully quantum framework and, as a consequence, can violate fundamental conservation laws like angular momentum even when the underlying equations are rotationally symmetric.

Masahiro Hotta, Sebastian Murk, Daniel R. Terno2026-04-14⚛️ gr-qc