Diabolical Points in Coupled Active Cavities with Quantum Emitters

14 Jan 2020  ·  Yang Jingnan, Qian Chenjiang, Xie Xin, Peng Kai, Wu Shiyao, Song Feilong, Sun Sibai, Dang Jianchen, Yu Yang, Shi Shushu, He Jiongji, Steer Matthew J., Thayne Iain G., Li Bei-Bei, Bo Fang, Xiao Yun-Feng, Zuo Zhanchun, Jin Kuijuan, Gu Changzhi, Xu Xiulai ·

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

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Optics Mesoscale and Nanoscale Physics