用准一维光晶格中的冷原子模拟二维晶格中带电粒子的回旋-布洛赫动力学

霍尔电导率超出线性响应范围

Hall conductivity beyond the linear response regime

本文介绍了一种在单带近似下计算霍尔电导率的半解析方法。该方法超越了线性响应理论，因此，对电场大小没有限制。当布洛赫频率（正比于电场）超过回旋频率（正比于磁场）时，霍尔电流随电场的增大而减小。所得结果可直接应用于二维光晶格中的冷玻色原子系统，其中单带近似是合理的。

二维光晶格中冷原子的外尔半金属物理模拟与探索

Simulating and exploring Weyl semimetal physics with cold atoms in a two-dimensional optical lattice

提出了一种在二维正方形光晶格中模拟和探索Weyl半金属物理的方案，该方案考虑了实验上可实现的自旋轨道耦合和从外部参数空间引入的人工维度，与三维光晶格中的情况相比，可以增加实验的可行性.结果表明，这个系统与紧束缚模型是能够描述本质上是三维Weyl半金属与可调Weyl点。相关的拓扑性质也解决了通过陈数和无隙边态。此外，我们说明，模仿外尔点可以通过测量在布洛赫-齐纳振荡的原子转移分数的实验检测，和特征拓扑不变量可以测量与粒子泵浦的方法。

A Simple game simulating quantum measurements of qubits

Games are useful tools for introducing new concepts to students. This paper describes a competitive two-player game for sophomore students in a modern physics survey course or junior/senior students in an introductory quantum mechanics course to build intuition and quantitative understanding of the probabilistic nature of quantum measurements in two-level systems such as qubits or the Stern-Gerlach experiment. The goal of the game is to guess a quantum state secretly chosen from a given set in the fewest number of measurements. It uses twenty-sided dice or other classical random number generat…

原子阱态合成维度上的布洛赫振荡

Bloch Oscillations Along a Synthetic Dimension of Atomic Trap States

首次实验实现极长且可控的原子谐振阱态合成维度，通过动态调制阱势引发布洛赫振荡，为高维拓扑物理探索奠定基础。

通过热场动力学模拟热量子比特

Simulating thermal qubits through thermofield dynamics

本文提出在量子计算环境中利用热场动力学（TFD）和 Bogoliubov 变换构建并模拟热量子比特，为教学提供直观方法。

基于量子行走启发的量子比特晶格算法，用于模拟保守和耗散磁化等离子体中的电磁波传播与散射

A Quantum Walk Inspired Qubit Lattice Algorithm for Simulating Electromagnetic Wave Propagation and Scattering in Conservative and Dissipative Magnetized Plasmas

提出一种量子行走启发的量子比特晶格算法，用于模拟磁化等离子体中电磁波传播与散射，具备多项式量子优势，并扩展至耗散情形。

Simulating non-Hermitian quasicrystals with single-photon quantum walks

Non-Hermiticity significantly enriches the properties of topological models, leading to exotic features such as the non-Hermitian skin effects and non-Bloch bulk-boundary correspondence that have no counterparts in Hermitian settings. Its impact is particularly illustrating in non-Hermitian quasicrystals where the interplay between non-Hermiticity and quasiperiodicity results in the concurrence of the delocalization-localization transition, the parity-time (PT)-symmetry breaking, and the onset of the non-Hermitian skin effects. Here we experimentally simulate non-Hermitian quasicrystals using …

在量子计算机上探测非平衡系统中的束缚态弛豫动力学

Probing Bound State Relaxation Dynamics in Systems Out-of-Equilibrium on Quantum Computers

该研究利用量子计算机的泵浦-探测模拟方法，研究混合场Ising模型的离散束缚态演化及伪真空衰变现象，发现布洛赫振荡是有限尺寸模型长寿命振荡的原因，为无辅助量子比特模拟非平衡系统奠定基础。

用于非平衡受驱开放量子系统的极化Houston态框架

Polarized Houston State Framework for Nonequilibrium Driven Open Quantum Systems

本研究提出纳入场致极化效应的极化Houston基理论框架，可在量子主方程中使用，经一维二聚体链模型验证，其能抑制虚假激发与虚跃迁、降低非物理直流电流，为光驱动开放量子材料的非平衡现象模拟提供有力工具。

Exploring topological double-Weyl semimetals with cold atoms in optical lattices

We explore the topological properties of double-Weyl semimetals with cold atoms in optical lattices. We first propose to realize a tight-binding model of simulating the double-Weyl semimetal with a pair of double-Weyl points by engineering the atomic hopping in a three-dimensional optical lattice. We show that the double-Weyl points with topological charges of \$pm2$ behave as sink and source of Berry flux in momentum space connecting by two Fermi arcs and they are stabilized by the \$C_{4h}$ point-group symmetry. By applying a realizable \$C_4$ breaking term, we find that each double-Weyl poi…

Transient fluorescence with a single trapped ion

In this paper we present a method to measure transient fluorescent dynamics with single trapped ions in a Paul trap. We use $^{40}$Ca$^+$ ions which exhibit a $Λ$-type three-level system and measure the characteristic optical pumping times between the ground $S_{1/2}$ and the meta-stable $D_{3/2}$ levels. We prepare one of these states, then pump it to the opposite via the excited $P_{1/2}$ state. By measuring the scattered photons of the ion, we retrieve transient curves of the atomic fluorescence. These curves provide fundamental information about the atomic system, such as branching fractio…

Exact solutions of few-magnon problems in the spin-$S$ periodic XXZ chain

We solve few-magnon problems for a finite-size spin-$S$ periodic Heisenberg XXZ chain with single-ion anisotropy through constructing sets of exact Bloch states achieving block diagonalization of the system. Concretely, the two-magnon (three-magnon) problem is converted to a single-particle one on a one-dimensional (two-dimensional) effective lattice whose size depends linearly (quadratically) on the total number of sites. For parameters lying within certain ranges, various types of multimagnon bound states are manifested and shown to correspond to edge states on the effective lattices. In the…

Electric fields for light: Propagation of microwave photons along a synthetic dimension

The evenly-spaced modes of an electromagnetic resonator are coupled to each other by appropriate time-modulation, leading to dynamics analogous to those of particles hopping between different sites of a lattice. This substitution of a real spatial dimension of a lattice with a "synthetic'" dimension in frequency space greatly reduces the hardware complexity of an analog quantum simulator. Complex control and read-out of a highly multi-moded structure can thus be accomplished with very few physical control lines. We demonstrate this concept with microwave photons in a superconducting transmissi…

温铷蒸气的非线性折射率

Nonlinear refractive index of warm rubidium vapor

基于光学布洛赫方程计算温铷蒸气的线性和非线性折射率，与干涉测量实验定量吻合，获得高达10^{-4} cm^2/W的Kerr非线性折射率。