Funding for this research was provided by:
National Natural Science Foundation of China (61572086, 61402058)
the Application Foundation Project of Sichuan Province of China (2017JY0168)
the National Key Research and Development Program (2017YFB0802302)
Sichuan innovation team of quantum security communication (17TD0009)
Sichuan academic and technical leaders training funding support projects (2016120080102643)
the Fund for Middle and Young Academic Leaders of CUIT (J201511)
Article History
Received: 10 March 2019
Accepted: 29 May 2019
First Online: 11 June 2019