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报告人：欧阳霄宇，California Institute of Technology
时间：9月8日（周二）10:00
单位：中国科学院理论物理研究所
地点：南楼6620
摘要:
We study the Néel quench dynamics of a 1D Fermi-Hubbard model which has recently been simulated on quantum hardware. We demonstrate that the set of 7260 observable trajectories measured in the quantum experiment can be obtained more quickly and accurately through classical tensor network simulation using modest computation. Our result relies on transverse tensor network contraction, where a bond dimension of 32 is already sufficient to reproduce the quantum experiment. We further extend the converged observable trajectories to longer times than in the hardware simulation and in other recent classical simulations.
The references: https://arxiv.org/abs/2608.13805, ttps://arxiv.org/abs/2605.04025
报告人简介:
Xiao-Yu is a 3rd year PhD candidate in Prof. Garnet Chan's group at Caltech. His work currently focuses on developing efficient tensor network methods to better simulate and understand quantum dynamics.
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报告人：方一奇，北京大学物理学院
时间：9月8日（周二）10:00
单位：中国科学院物理研究所
地点：怀柔园区X1楼101会议室
腾讯会议：474-538-317
会议密码：260908
摘要:
激光激发的电子运动使人们能够以前所未有的时间、空间和能量分辨率研究基础物理现象。结构光为调控材料的光学响应提供了全新的自由度，其能力远超传统线偏振光和圆偏振光。在本报告中，我将介绍结构光与束缚电子以及自由空间电子脉冲相互作用时所产生的物理现象及其应用。在原子体系中，我将展示强场电离产生的光电子动量谱如何作为强激光场的原位探针，以及高次谐波产生如何高效地产生具有按需时空拓扑结构的极紫外辐射。在自由空间中，我们利用自支撑电子透明氮化硅薄膜，在超快透射电子显微镜中制备并表征了两类手性电子：具有手性质量和手性电荷分布的电子，以及具有内部转矩的电子。
报告人简介:
方一奇，北京大学助理教授（研究员）。分别于2017年和2022年获得厦门大学学士和北京大学博士学位，2023-2025年在德国康斯坦茨大学物理系从事博士后研究工作，于2025-2026年于德国慕尼黑大学物理学院从事博士后研究。2026年7月加入北京大学物理学院。主要从事阿秒电子显微镜、自由电子物理、强场阿秒物理、光场调控等相关研究。迄今为止发表论文40余篇，其中以第一作者多次在Science、Nature Physics、Nature Photonics、Nature Reviews Physics、PRL，Light等期刊发表重要研究成果。曾获德国洪堡学者（2022）、王大珩光学奖（2021）、郭光灿光学奖（2023）等学术奖励。
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报告人：赖志坚，北京大学
时间：9月8日（周二）10:30
单位：中国科学院计算技术研究所
链接：
摘要:
面向基态制备的量子线路设计是量子计算领域的基础研究问题。然而，标准变分量子算法普遍存在量子线路拟设表达能力有限、优化过程易陷入困境等瓶颈。为突破上述局限，本文从几何视角出发，将量子线路设计问题转化为酉群上的能量函数最小化问题，构建了基于回缩的黎曼优化框架，确保算法各步骤可直接在量子硬件上执行。依托该框架，本文提出黎曼随机子空间梯度投影法（Riemannian Random Subspace Gradient Projection, RRSGP），实现了对现有随机梯度类算法的统一表述。另外，本文还推导了黎曼 Hessian 的显式表达式，证明其可通过参数平移规则在量子硬件上直接估算。基于此，进一步提出黎曼随机子空间牛顿法（Riemannian Random Subspace Newton, RRSN），该算法为可扩展的二阶优化方法，能够依托测量数据构建牛顿方程。数值实验结果表明，相较于现有一阶算法及标准变分量子算法，RRSN 算法具备二次收敛特性，仅需更少迭代次数即可制备出高精度基态。综上，本工作为将各类高效黎曼优化算法系统性应用于量子线路设计奠定了理论与方法基础。
报告人简介:
赖志坚，北京大学北京国际数学研究中心博雅博士后，国家自然科学基金青年科学基金项目（C类）负责人。他于2024年在日本筑波大学获得博士学位，同年起在北京大学文再文教授课题组从事博士后研究工作。他的科研围绕流形优化、量子计算与优化的交叉领域展开，重点研究参数化量子线路优化、量子算法设计以及流形优化在人工智能中的应用。目前已发表论文8篇，研究成果发表于 IEEE Transactions on Pattern Analysis and Machine Intelligence、SIAM Journal on Scientific Computing、Communications Physics 等期刊。
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报告人：胡仑辉，浙江大学物理学院
时间：9月8日（周二）12:00
单位：江苏省物理学会，南京大学物理学院
链接：
摘要:
交错磁体是一类新发现的共线反铁磁体，其特征为非相对论性自旋劈裂能带，为量子材料开辟了新前沿。在本次报告中，我将讨论交错磁性的两个关键方面。首先，我将展示交错磁性如何促成新颖的量子现象：(i) 由自旋群对称性调控的非相对论性自旋-轨道锁定/织构的出现；(ii) 独特的超导邻近效应：在节线型交错磁体中，我们发现有限动量的自旋单态对；而在无节型交错磁体中，我们发现自旋极化的约瑟夫森超流。我还将展示KV2Se2O-家族交错磁体材料中独特的层依赖交错磁性奇偶效应，其中准一维自旋劈裂费米面已通过自旋选择性准粒子干涉被探测到。其次，我将超越能带理论，展示交错磁性涨落对凝聚态理论至关重要。它完善了成熟的铁磁性Stoner理论，并且通过其涨落，可在 van Hove 奇点填充附近介导非常规自旋三重态超导体。
报告人简介:
胡仑辉，浙江大学百人计划研究员。于2013年和2018年在浙江大学分别获得学士和博士学位，此后在美国加州大学圣迭戈分校、宾夕法尼亚州立大学、田纳西大学以及芬兰阿尔托大学从事博士后研究。2023年入选国家海外高层次青年人才计划，并于2024年加入浙江大学。他的研究方向为凝聚态物理中新型量子现象的理论探索，尤其关注拓扑态、非常规超导电性和磁性。迄今已发表论文50余篇，其中Nat Phys/Nat Mater(2), PRL(4), Nat Comm/Sci Adv(5), Adv Mater(1).
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报告人：Zhu Cao，Tongji University
时间：9月9日（周三）14:00
单位：复旦大学 理论物理报告会
链接：
摘要:
Private function evaluation is a task that aims to obtain the output of a function while keeping the function secret. So far its quantum analogue has not yet been articulated. In this study, we initiate the study of quantum private function evaluation, the quantum analogue of classical private function evaluation. We give a formal definition of quantum private function evaluation and present two schemes together with their security proofs. We then give an experimental demonstration of the scheme. Finally, we apply quantuim private function evaluation to quantum copy protection to illustrate its usage.
报告人简介:
Dr. Zhu Cao received his Bachelor's degree and Ph.D. degree from Tsinghua University in 2013 and 2017, respectively. He is currently an Associate Professor at Tongji University. His research interests include quantum information, information security, and artificial intelligence. He has led four national and provincial research projects and has published 40+ research papers in top-tier journals such as PRX, PRL, and PNAS. In particular, he has published 16 papers in Physical Review joumnals and 9 papers receiving more than 100 citations each.
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报告人：曾长淦，中国科学技术大学
时间：9月10日（周四）15:30
单位：南京大学物理学院
链接：
摘要:
量子零点能引发的量子涨落，能够诱发一系列独特的量子效应，包括自发辐射、兰姆位移、以及卡西米尔效应。在本次报告中，我将介绍我们在凝聚态体系量子涨落研究领域取得的系列进展。我们成功研制出扫描卡西米尔力显微镜，并基于这一设备在磁流体中实现了卡西米尔力从吸引到排斥的磁场调控。自由空间中的量子涨落强度通常较弱，很难对宏观凝聚态物质产生可观测效应；我们进一步通过构筑暗腔来增强量子涨落，从而实现了NbSe2超导电性的增强。我们还在石墨烯与LaAlO₃/SrTiO₃超导界面的电双层中，观测到显著的超流拖拽效应；该效应源于超导约瑟夫森结阵列中超导相位动力学量子涨落与石墨烯电子之间的库伦相互作用 。上述研究结果表明，量子涨落在凝聚态物理领域能够催生新奇物理效应，尤其为宏观量子效应提供了全新的调控旋钮。
报告人简介:
曾长淦，中国科学技术大学讲席教授、教育部“长江学者”特聘教授。分别于1997年、2002年获中国科学技术大学理学学士学位与理学博士学位，2002至2007年于美国田纳西大学开展博士后研究，2007年入职中国科学技术大学，任物理学院、合肥微尺度物质科学国家研究中心教授。长期深耕于低维凝聚态物理与电学量子计量领域，在量子材料电子态、量子输运特性的设计与精准调控，及其在量子计量领域的应用研究中取得一系列成果。近年来，聚焦凝聚态体系量子涨落效应研究，一方面研发基于卡西米尔相互作用的新型精密探测技术；另一方面积极探索真空涨落的主动调控机制，突破其传统被动背景属性，致力于将其发展为调控量子物质物性的全新手段。
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报告人：Zhengyan Darius Shi，Stanford University
时间：9月11日（周五）9:00
单位：新加坡国立大学理学院物理系
链接：
摘要:
The concept of composite fermions (CF) is a cornerstone of the quantum Hall phase diagram. Famously, in the half-filled Landau level, CFs form a metallic state known as the composite Fermi liquid (CFL), which is arguably the best understood example of a non-Fermi liquid metal without well-defined quasiparticles. In the conventional Landau level setting, Galilean symmetry forces the CF dispersion to be circularly symmetric in momentum space. While this symmetry simplifies many calculations, it conceals some of the most striking phenomena intrinsic to CFs. In this talk, I will explain how these phenomena emerge when the symmetries of the CFL state are reduced. Motivated by the recent experimental realization of a zero-field CFL in twisted MoTe2 and rhombohedral graphene, we consider a CF bandstructure with three-fold rotation symmetry and no inversion symmetry. We show that: (1) in the CFL, broken inversion leads to a quantum critical optical conductivity that probes the dynamical exponent of the gauge fluctuations; broken continuum translation leads to a power-law temperature-dependent resistivity. (2) pairing of CFs with broken inversion gives a novel composite Bogoliubov Fermi liquid (CBFL) with a gapless Bogoliubov Fermi surface of CFs. Among its many exotic properties, the CBFL realizes a stable gapless topological phase with a two-fold torus ground state degeneracy, which does not fit into the "fractionalized Fermi liquid" framework. These results promise new physics of CFs in various FQAH platforms that extend beyond the half-filled Landau level.
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报告人：Damjan Pelc, Department of Physics, Faculty of Science, University of Zagreb, Croatia
时间：9月11日（周五）15:30
单位：中国科学院物理研究所
地点: M253会议室
摘要:
Uniaxial strain is an increasingly important tuning parameter in the physics of quantum materials, and in the past decade it has been used to study and manipulate both electronic and structural ordering phenomena in a wide range of systems. Yet uniaxial strain studies of dynamical properties such as lattice vibrations and spin excitations are still in their infancy, since it is difficult to obtain controlled uniaxial strain in large bulk samples suitable for use with techniques such as inelastic neutron scattering. In this talk, I will present new advances that have been made possible by the development of high-force uniaxial strain cells, which use helium gas pneumatics to generate large and finely controllable stress levels. These devices have enabled a number of important insights using both in situ and ex situ uniaxial deformation, and I will discuss our recent results on the effects of elastic and plastic deformation on phonons in the incipient ferroelectrics SrTiO3 and KTaO3 and PbTe, the manipulation of structural fluctuations in the cuprate high-temperature superconductor La2-xSrxCuO4, and strain tuning of magnetism in the Kitaev spin liquid candidate material RuCl3.
报告人简介:
Dr. Damjan Pelc obtained his PhD from the University of Zagreb, Croatia, in 2017, and spent three years as a postdoctoral researcher at the University of Minnesota in the group of Prof. Martin Greven. He is now Associate Professor at the University of Zagreb, where he leads a group with focus on experimental condensed matter physics. His interests are in the field of quantum materials, primarily unconventional superconductivity in complex oxides and layered materials, as well as exotic magnetism and quantum spin liquid phases. His group uses a combination of experimental approaches, including neutron and x-ray scattering, optical spectroscopy, and magnetic resonance, and is actively engaged in the development of new techniques.
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https://news.sciencenet.cn/htmlpaper/2024/2/20242219533791095663.shtm
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