Differential phase-shift quantum key distribution

Kyo Inoue; Edo Waks; Yoshihisa Yamamoto

doi:10.1117/12.483037

13 September 2002 Differential phase-shift quantum key distribution

Kyo Inoue, Edo Waks, Yoshihisa Yamamoto

Proceedings Volume 4917, Quantum Optics in Computing and Communications; (2002) https://doi.org/10.1117/12.483037
Event: Photonics Asia, 2002, Shanghai, China

Abstract

This paper presents novel quantum key distribution (QKD) schemes that use differential phases of sequential pulses as an information carrier. Alice sends a photon in a linear superposition state of three temporal slots, in which each amplitude is phase-modulated by {0,π}. Bob measures the phase difference of an asymmetric interferometer, and tells Alice time-instance at which the photon was counted. From this time information and her modulation data, Alice knows which detector counted the photon in Bob s site. Then, the two parties create a secret key. The scheme is suitable for fiber transmission systems and offers key creation efficiency higher than conventional phase-encoding QKD. The above scheme utilizes fully non-orthogonal four states. Differential phase shift QKD utilizing two non-orthogonal states is also presented. Alice sends a coherent pulse train with less than one photon per pulse, which is phase modulated by {0,π} for each pulse, and Bob measures the pulse train by a one-bit delay circuit. The system has a simple configuration such that Alice has no interferometer and sends no intense reference pulse, unlike to conventional QKD scheme using two non-orthogonal states, and also has an advantage of high key creation efficiency.

Citation Download Citation

Kyo Inoue, Edo Waks, and Yoshihisa Yamamoto "Differential phase-shift quantum key distribution", Proc. SPIE 4917, Quantum Optics in Computing and Communications, (13 September 2002); https://doi.org/10.1117/12.483037

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