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Acta Optica Sinica

Phase-Matched Passive-Decoy-State Quantum Key Distribution Based on Heralded Single Photon Source

虞味 Yu Wei, 周媛媛 Zhou Yuanyuan

Published Jan 1, 2021• 1 citation
Publisher
DOI
10.3788/aos202141.0227001

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Based on the model of quantum key distribution(QKD) system with a heralded single photon source(HSPS),three typical BB84-decoy-state methods are introduced including active decoy-state protocol, passive decoy-state protocol and the protocol combining active and passive decoy-state idea.The performance and implementation difficulty of the three decoy-state methods are analyzed with numerical simulation.The results show that the key generation rate of BB84 decoy-state protocol is increased by the passive decoy idea.Passive decoy-state method proposed by Adachi,Yamamoto,Koashi and Imoto(AYKI) is easy to implement and speedy to distribute keys because there is no need to prepare decoy states actively. Furthermore,the performance of the AYKI protocol is close to that of the infinite decoy-state protocol. The performance of the method combining active and passive decoy-state idea is better than that of AYKI protocol,but there is not much room left for improvement after the AYKI protocol is implemented.

Chinese Journal of Quantum Electronics•Jan 1, 2010•0 citations
Decoy states have recently been proposed as a useful protocol for substantially improving the performance of quantum key distribution (QKD). The passive decoy-state protocol has the advantage of easier implementation, higher transmission rate and better security compared with the active decoy-state protocol. This paper analyzes the passive decoy-state protocol with different light sources, including the lastest passive state protocol with weak coherent state (WCS) and the simple passive state protocol (AYKI) with heralded single photon source (HSPS). Based on the theoretic discussion and numerical simulation, we obtain the conclusion that the passive decoy-state protocol with HSPS is easier to implement than the passive decoy-state protocol with WCS because the latter need a hardware change but the former dose not involve any hardware change on the statnard QKD scheme. The key generation rate of the passive decoy-state protocol with WCS is better than that of the passive decoy-state protocol with HSPS, but the transmission distance is less than the latter. Anyhow, the performance of the passive scheme with a threshold detector is close to the active one.
Based on the model of quantum key distribution(QKD) system with a heralded single photon source(HSPS),three typical BB84-decoy-state methods are introduced including active decoy-state protocol, passive decoy-state protocol and the protocol combining active and passive decoy-state idea.The performance and implementation difficulty of the three decoy-state methods are analyzed with numerical simulation.The results show that the key generation rate of BB84 decoy-state protocol is increased by the passive decoy idea.Passive decoy-state method proposed by Adachi,Yamamoto,Koashi and Imoto(AYKI) is easy to implement and speedy to distribute keys because there is no need to prepare decoy states actively. Furthermore,the performance of the AYKI protocol is close to that of the infinite decoy-state protocol. The performance of the method combining active and passive decoy-state idea is better than that of AYKI protocol,but there is not much room left for improvement after the AYKI protocol is implemented.