Simulating Chiral Dynamics in Quantum Optics
Speaker
Prof. Da-Wei Wang
Department of Physics, Zhejiang University
Abstract

Topological or chiral physics have been vastly investigated in electrons, photons and phonons. In electrons, large magnetic field and low temperature are usually necessary. Topological photonic and acoustic structures require exotic methods to synthesize gauge field. I will introduce a momentum-space lattice composed by timed Dicke states (single photon superradiant states) [1], based on which the chiral edge currents are observed in atoms at room temperature [2]. This quantum optical system requires neither magnetic field nor low temperature and can be extended to simulate the Haldane model [3]. A variation of the Haldane model can also be realized in a cavity QED system, which involves with synthetic spin-orbit coupling and effective magnetic fields for photons in a Fock-state lattice [4]. We experimentally realized a similar scheme in superconducting qubits, where anti-symmetric spin exchange interaction (also known as the Dzyaloshinskii-Moriya interaction) was synthesized and dynamics of chiral spin clusters were observed [5].


References:
[1] D.-W. Wang, R.-B. Liu, S.-Y. Zhu and M. O. Scully, PRL 114, 043602 (2015).
[2] H. Cai, J. Liu, J. Wu, S.Y. Zhu, J. X. Zhang and D.-W. Wang, Phys. Rev. Lett. 122, 023601 (2019).
[3] D.-W. Wang, H. Cai, L. Yuan, S.-Y. Zhu and R.-B. Liu, Optica 2, 712 (2015).
[4] D.-W. Wang, Han Cai, Renbao Liu and M.O. Scully, Phys. Rev. Lett. 116, 220502 (2016).
[5] D.-W. Wang, C. Song, W. Feng, H. Cai, D. Xu, H. Deng, H. Li, D. Zheng, X. Zhu, H. Wang, S.Y. Zhu and M.O. Scully, Nature Physics 15, 382-386 (2019)


About the Speaker

王大伟于2006年同济大学本科毕业, 2012年获得香港中文大学物理学博士; 后加入美国德克萨斯州农工大学国际量子光学领域Scully组, 先后担任博士后、研究助理教授和研究副教授。2017年作为百人计划研究员加入浙江大学物理系, 2018年入选青年千人计划项目。主要研究拓扑量子光学、超辐射晶格、海森堡极限下的超辐射测量学、光二极管等。截至目前共发表30余篇SCI收录文章, 包括7篇PRL和1篇Nature Physics, 其中1篇PRL文章被Web of Science选为物理领域前1%高引用率文章, 1篇Optica文章因提出用超辐射探测拓扑绝缘体相变被编辑选为期刊封面文章。


Date&Time
2019-04-27 10:00 AM
Location
Room: A403 Meeting Room
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