[23p-A601-1~10] 3.9 Optical quantum physics and technologies (formerly 3.10)

1:45 PM - 2:00 PM JST(4:45 AM - 5:00 AM UTC)

[23p-A601-3] Scalability of differential-phase-shift quantum digital signature

〇Kyo Inoue¹, Toshimori Honjo² (1.Osaka Univ., 2.NTT Labs.)

Keywords:

quantum communication,quantum digital signature,differential phase shift

Quantum digital signature (QDS) is a quantum technology that confirms whether a received message is legitimate by comparing a signature key attached to the message and an authentication key publicly distributed in advance. We previously proposed a QDS protocol, called DPS-QKD, which features the simplicity in the key distribution process. Subsequently to the previous proposal, we investigate the capacity of DPS-QDS systems in terms of the number of recipients in this study, and shows that several hundreds of recipient can be accommodated in 100-km transmission systems.