Practical decoy-state BB84 quantum key distribution with quantum memory

• 作者: Xian-Ke Li Xiao-Qian Song Qi-Wei Guo Xing-Yu Zhou Qin Wang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: GENERAL
• 页码范围: 149-153
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/abda31

摘要

We generalize BB84 quantum key distribution (QKD) to the scenario where the receiver adopts a heralded quantum memory (QM).With the heralded QM,the valid dark count rate of the receiver's single photon detectors can be mitigated obviously,which will lower the quantum bit error rate,and thus improve the performance of decoy-state BB84 QKD systems in long distance range.Simulation results show that,with practical experimental system parameters,decoy-state BB84 QKD with QM can exhibit performance comparable to that of without QM in short distance range,and exhibit performance better than that without QM in long distance range.