摘要
We propose a fully symmetrical QKD system that enables quantum states to be prepared and measured simultaneously without compromising system performance.Over a 25.6 km fiber channel,we demonstrate point-to-point QKD operations with asymmetric Mach–Zehnder interferometer modules.Two interference visibilities of above99%indicate that the proposed system has excellent stability.Consequently,the scheme not only improves the feasibility of distributing secret keys,but also enables QKD closer to more practical applications.
基金
Supported by the Fundamental Research Funds for the Central Universities(Grant No.2019XD-A02)
the State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications(Grant No.IPO2019ZT06)。
