[16a-PA1-1~4] 3.10 Optical quantum physics and technologies

[16a-PA1-1] Studies in effects of afterpulse events on entanglement-based quantum-key-distribution systems

〇Shin Arahira¹, Hitoshi Murai¹ (1.Oki Electric)

Keywords:quantum key distribution,quantum entanglement,afterpulse

we examine the performance of an entanglement-based quantum-key-distribution (QKD) system using single-photon detectors (SPDs) with poor afterpulse characteristics, both theoretically and experimentally. We determine that afterpulse probability, P_a, in the SPDs does not bind the lowest limit of the error rate in the sifted keys of the entanglement-based QKD system. Secure secret key sharing is possible even when P_a is considerably large, for example, exceeding 100%.