Diabolical points in coupled active cavities with quantum emitters

Jingnan Yang; Chenjiang Qian; Xin Xie; Kai Peng; Shiyao Wu; Feilong Song; Sibai Sun; Jianchen Dang; Yang Yu; Shushu Shi; Jiongji He; Matthew J Steer; Iain G Thayne; Bei-Bei Li; Fang Bo; Yun-Feng Xiao; Zhanchun Zuo; Kuijuan Jin; Changzhi Gu; Xiulai Xu

doi:10.1038/s41377-020-0244-9

Diabolical points in coupled active cavities with quantum emitters

Light Sci Appl. 2020 Jan 13:9:6. doi: 10.1038/s41377-020-0244-9. eCollection 2020.

Authors

Jingnan Yang^#^{1

2}, Chenjiang Qian^#^{1

2}, Xin Xie^{1

2}, Kai Peng^{1

2}, Shiyao Wu^{1

2}, Feilong Song^{1

2}, Sibai Sun^{1

2}, Jianchen Dang^{1

2}, Yang Yu^{1

2}, Shushu Shi^{1

2}, Jiongji He^{1

2}, Matthew J Steer³, Iain G Thayne³, Bei-Bei Li¹, Fang Bo⁴, Yun-Feng Xiao⁵, Zhanchun Zuo^{1

2}, Kuijuan Jin^{1

2

6}, Changzhi Gu^{1

2}, Xiulai Xu^{1

2

6}

Affiliations

¹ 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China.
² 2CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China.
³ 3School of Engineering, University of Glasgow, Glasgow, G12 8LT UK.
⁴ 4The MOE Key Laboratory of Weak Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin, 300457 China.
⁵ 5State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing, China.
⁶ Songshan Lake Materials Laboratory, Dongguan, 523808 Guangdong China.

^# Contributed equally.

Abstract

In single microdisks, embedded active emitters intrinsically affect the cavity modes of the microdisks, resulting in trivial symmetric backscattering and low controllability. Here we demonstrate macroscopic control of the backscattering direction by optimizing the cavity size. The signature of the positive and negative backscattering directions in each single microdisk is confirmed with two strongly coupled microdisks. Furthermore, diabolical points are achieved at the resonance of the two microdisks, which agrees well with theoretical calculations considering the backscattering directions. Diabolical points in active optical structures pave the way for an implementation of quantum information processing with geometric phase in quantum photonic networks.

Keywords: Micro-optics; Microresonators.