学术报告（4月26日10:00 – 11:30）

主持人：项泽亮 教授

欢迎广大师生前来参与！

【摘要】

Quantum systems are unavoidably coupled to their environments, which make the systems different from the isolated ones. This system-environment setup is called the open quantum system. The key target in such problems is to characterize the influence of the environments efficiently and precisely. Within the framework of the Born-Markovian approximation, open quantum systems can be generally described with the Lindblad master equation. However, it is difficult to obtain a universal solution beyond the Born-Markovian approximation. Therefore, researchers apply numerical methods to simulate those complicated open systems. In this talk, some of the works on simulation of bosonic environments will be introduced. This kind of environments mainly describe the coupling to the photon and the phonon and have close relations to the dephasing and the dissipation phenomena in the field like quantum optics or quantum information. 
量子系统往往避免不了与外界的环境的相互作用，导致系统的特性与孤立系统有所区别。这种系统和环境一起被称为开放量子系统。研究这类系统的关键点在于如何精确且有效地刻画环境对系统的影响。在波恩马尔可夫近似的框架下，开放量子系统可以被统一地Lindblad主方程来描述，但假如不采取近似，则很难得到一个普适的解。因此研究者会利用数值方法去模拟这些复杂的开放系统。在这个讲座中，我将介绍对玻色子环境的开放系统的相关模拟工作。这一类环境主要描述光子与声子的相互作用，与量子光学和量子信息中讨论的退相位和退相干有着密切的联系。

【报告人简介】

Zheng-Yang Zhou obtained the Ph.D degree from Fudan University in 2017. He is currently working as a JSPS post-docotoral fellowship in the Theoretical Quantum Physics Laboratory, Riken, Japan. His research topic is non-Markovian open quantum systems and quantum thermodynamics.