量子科学论坛(112)|景俊:Floquet engineering in cavity-magnonic system

2023/11/24

【时  间】 2023年12月1日(周五) 上午 10:00

【地  点】 量子院320报告厅

【主  持】 李铁夫(量子工程研究部执行部长

【题  目】 Floquet engineering in cavity-magnonic system

【摘  要】 Floquet engineering by fast periodic modulation over the characteristic frequency of a quantum system is a major approach to the desired effective Hamiltonian and controls the long-time dynamics of the system. We find that the Floquet engineering can induce a synthetic gauge field and realize a chiral state transfer in a cavity-magnonic system. In particular, the cavity mode is adiabatically eliminated in the large-detuning regime and the magnon modes under conditional longitudinal drives can be indirectly coupled to each other with a phase-modulated interaction. Moreover, we find that the time modulation over the interaction between an ancillary qubit and the cavity mode can be used to replace the Floquet driving over the magnon frequency for generating the chiral state transfer and then relieves the strict requirement on the relative phases in driving. Our protocol applies to continuous-variable systems with arbitrary states and can be used to generate symmetrical entangled states. It is found to be robust against systematic errors in the coupling strength.

   References:

[1] S. Qi and J. Jing*, Chiral current in Floquet cavity-magnonics, Physical Review A 106, 033711 (2022).

[2] S. Qi and J. Jing*, Floquet generation of a magnonic NOON state, Physical Review A 107, 013702 (2023).

 

【报告人简介】 景俊,浙江大学物理学院光学与量子信息研究所教授、博士生导师。上海交通大学物理系本科(1998~2002)、硕博连读(2002~2007),理论物理博士。曾任上海大学物理系讲师、副教授;美国史蒂文斯理工学院研究助理;西班牙巴斯克大学理论物理系、美国纽约大学水牛城分校物理系(2013~2014)、香港理工大学应用物理系访问学者;吉林大学原子与分子物理研究所教授、博士生导师。致力于开放量子系统、光与物质相互作用的量子调控、量子退相干、量子测量基本理论以及几何量子计算方向的研究。

当前主持国家自然科学基金面上基金三项、青年基金一项,参与国家自然科学基金联合基金一项。出版译著两本:1:《量子光学导论》(清华大学出版社2019) 2:《原子与光子相互作用:基本过程和应用》(清华大学出版社2021,合译)。发表论文80余篇(半数以上为美国物理评论系列)。原创性工作包括:(1)解决了真空环境下任意三能级量子系统的精确动力学问题;(2)在精确动力学基础上给出量子系统与环境之间发生动力学解耦的必要条件;(3)在开放系统的理论框架下拓展了量子绝热定理;(4)提出量子芝诺效应的简单物理判据;(5)提出冷却量子机械振子的高效率迭代方案。