Funding for this research was provided by:
the National Natural Science Foundation of China (62076042, 61572086)
the Key Research and Development Project of Sichuan Province (2020YFG0307, 2018TJPT0012)
the Key Research and Development Project of Chengdu (2019-YF05-02028-GX)
the Innovation Team of Quantum Security Communication of Sichuan Province (17TD0009)
the Academic and Technical Leaders Training Funding Support Projects of Sichuan Province (2016120080102643)
Article History
Received: 23 August 2020
Accepted: 26 December 2020
First Online: 4 February 2021