报告1
【报告题目】: 超冷原子准二维盒型势中的两体问题
【报 告 人】：杨凡博士，合肥国家实验室
【报告地点】：29幢414
【报告时间】：2025年10月30日（周四），14:00
【报告摘要】：We study the scattering and two-body bound states of two ultracold atoms in a quasi-two-dimensional (quasi-2D) confinement, with an infinitely deep square well (box potential) in the transverse (z-direction) and free motion in the x–y plane. Specifically, we calculate the effective 2D scattering length and 2D effective range parameter for low-energy scattering, as well as the energy and transverse-excited-mode probability of the bound states. By comparing these results with those under a harmonic transverse confinement potential with the same characteristic length, we find that, in most cases, the effective 2D range parameter for the box confinement is approximately 0.28 times that for the harmonic confinement. Moreover, the transverse-excited-mode probability of the bound states under the box confinement is also significantly lower than that under the harmonic confinement. These results indicate that transverse excitations are considerably weaker in the box confinement compared to the harmonic confinement with the same characteristic length. Therefore, it is more feasible to realize quasi-2D ultracold gases that can be well described by pure 2D effective models—especially those with 2D contact interactions—using box confinement. Our results are helpful for quantum simulations of 2D many-body physics with ultracold atoms.
【报告人简介】：杨凡，2016年本科毕业于山东大学，2016年至2024年在中国人民大学攻读硕士学位和博士学位，现在合肥国家实验室从事博士后研究工作。研究方向为超冷原子分子气体理论研究。
报告2
【报告题目】: 多比特离子量子比特的探测与操控
【报 告 人】：王玉欣，中国人民大学
【报告地点】：29幢414
【报告时间】：2025年10月30日（周四），15:00
【报告摘要】：Trapped ions remain a leading platform for scalable quantum computing, offering superior coherence times, high-fidelity operations, and large entangled states. This report demonstrates scalable techniques and a small-scale, fully controllable trapped-ion system. We trap multiple ^{171}Yb^{+} ions using radio-frequency fields and implement individual laser addressing to enable independent qubit control. With these tools, we realize universal quantum gates on arbitrary single qubit and qubit pairs, establishing the capability for universal quantum computation.
【报告人简介】：王玉欣，2019年本科毕业于河北大学，物理科学与技术学院。现为中国人民大学张翔课题组在读博士研究生。研究方向为离子阱量子计算。
