Practical Reference-Frame-Independent Measurement-Device-Independent Quantum Key Distribution Systems Against the Worst Relative Rotation of Reference Frames

摘要

Reference-frame-independent measurement-device-independent QKD (RFI-MDI-QKD),immune to both the slow unknown drift of reference frames and detector side channel attacks,can generate information-theoretic secure keys.Despite its natural resistance to the slow drift of reference frames,the performance of practical RFI-MDI-QKD systems descends with the increasing drift of reference frames.In this paper,we demonstrate the worst relative rotation of reference frames for practical RFI-MDI-QKD systems,and investigate their performance against the worst-case scenario,both of which are unclear to date.Simulation results show that,practical RFI-MDI-QKD systems can achieve quite good performance even against the worst-case scenario,which clearly demonstrates that it is possible to implement practical MDI-QKD systems with freely drifting reference frames.