[6a-PA4-1~6] 3.10 Optical quantum physics and technologies

[6a-PA4-2] Decoy phase modulated DPS-QKD

〇Katsuhiko Ikezaki¹, Kyo Inoue¹ (1.Osaka Univ.)

Keywords:Quantum cryptography, Quantum key distribution, Differential phase shift quantum key distribution

We have been studying differential phase shift quantum key distribution (DPS-QKD) using a highly attenuated coherent pulse train that is randomly phase-modulated by {0,π} for each pulse. In this research, we propose decoy phase-modulated DPS-QKD. This protocol randomly inserts (±π/2) phase modulated pulses (decoy modulation) in a pulse train, and detects eavesdropping from simultaneous photon detection rate at the receiver.