Practical decoy-state round-robin differential-phaseshift quantum key distribution

Abstract

To overcome the signal disturbance from the transmission process, recently, a new type of protocol named round-robin differential-phase-shift(RRDPS) quantum key distribution[Nature 509, 475(2014)] is proposed. It can estimate how much information has leaked to eavesdropper without monitoring bit error rates. In this paper, we compare the performance of RRDPS using different sources without and with decoy-state method, such as weak coherent pulses(WCPs) and heralded single photon source(HSPS). For practical implementations, we propose finite decoy-state method for RRDPS, the performance of which is close to the infinite one. Taking WCPs as an example, the three-intensity decoystate protocol can distribute secret keys over a distance of 128 km when the length of pulses packet is 32, which confirms the great practical interest of our method.

arXiv comment24 pages, 7 figures

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Cited by in corpus (4)

• Practical round-robin differential-phase-shift quantum key distribution
• A security proof of the round-robin differential phase shift quantum key distribution protocol based on the signal disturbance
• Decoy-state round-robin differential-phase-shift quantum key distribution with source errors
• Technique of active phase stabilization for the interferometer with 128 actively selectable paths