报告题目：用超冷原子在光晶格中实现拓扑泵：从量子模拟到量子计算
Topological pump with ultracold atoms in optical lattices: from quantum simulation to quantum computing
报告人：朱子杰 博士
报告人单位：瑞士联邦理工（ETH）
主持人：邓书金 研究员
报告时间：2024年10月20日（周日）上午10:00
报告地点：光学大楼B225会议室
报告内容：
将原子冷却到量子态，然后将它们装载到由激光驻波场形成的光学晶格中，这种制备超冷原子的技术提供了研究各种量子现象的理想平台，例如强关联多体系统、拓扑相和复杂材料的量子模拟。此外，得利于对原子间相互作用、晶格几何结构和外部场的精确控制，它也在量子计算方向具有很大的前景。
我的工作围绕拓扑泵展开。拓扑泵指的是粒子在晶格参数循环调制下展现出的定向量子化位移。与量子霍尔效应类似，拓扑泵将可测量的物理量（如粒子流）与对扰动具有鲁棒性的几何性质联系起来，因此具有丰富的应用价值。我们实现了一种能够在光学晶格中实现超过一百个格点位移的拓扑泵，这使我们能够进一步探索拓扑量子物质和由相互作用驱动的拓扑相变。这一进展也为在光学晶格中实现通用量子计算和费米子量子处理提供了新的方向。
Ultracold atoms in optical lattices—achieved by cooling atoms to a quantum regime and loading them into an optical lattice formed by a stationary laser light wave—provide an ideal platform for studying a wide range of quantum phenomena, including strongly correlated many-body systems, topological phases, and quantum simulations of complex materials. Additionally, the ability to precisely control atomic interactions, lattice geometry, and external fields makes it an excellent candidate for exploring quantum information processing and simulating condensed matter systems.
My work centers on the concept of the topological pump, which represents the quantized motion of particles in response to a cyclic modulation of lattice parameters. Similar to the quantum Hall effect, the topological pump is of fundamental interest because it links physically measurable quantities, such as particle currents, to geometric properties that are robust against perturbations, making them technologically useful. We demonstrate a scheme that enables topological pumping over a hundred lattice sites, facilitating the exploration of topological quantum matter and interaction-driven topological transitions. This advancement in shuttling fermonic quantum states also paves the way for universal quantum computation and fermionic quantum processing in optical lattices.
报告人简介：
朱子杰，本科毕业于北京大学物理学院，后在瑞士联邦理工（ETH）获得物理学硕士学位并继续攻读博士，导师为Prof. Tilman Esslinger，主要研究方向为量子光学，量子模拟和量子计算。以第一作者在Science, Nature Physics上发表论文，并在Physical Review Letters，Physical Review Research，Physical Review X等期刊上发表合作文章。