Decoy-state round-robin-differential-quadrature-phase-shift quantum key distribution protocol
Round-robin-differential-phase-shift(RRDPS)is a special high-dimensional phase-coding quantum key distribution protocol.It has two distinctive advantages of free for parameter monitoring and its high error tolerance.Round-robin-differential-quadrature-phase-shift(RRDQPS)is a variant of this protocol,which encodes four different phases instead of two to improve performance.Though these RRDPS-type protocols can run without parameter monitoring,the performance can be improved with parameter monitoring.In this article,we propose a decoy-state scheme for the RRDQPS protocol,giving a tight key rate formula by monitoring the click rates of different intensities.According to our numerical simulation,our scheme has a distinct performance advantage compared with the scheme without decoy states.
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