Differential-phase-shift quantum key distribution

Kyo Inoue; Hiroki Takesue; Toshimori Honjo

doi:10.1117/12.733442

10 September 2007 Differential-phase-shift quantum key distribution

Kyo Inoue, Hiroki Takesue, Toshimori Honjo

Proceedings Volume 6780, Quantum Communications Realized; 678015 (2007) https://doi.org/10.1117/12.733442
Event: Optics East, 2007, Boston, MA, United States

Abstract

A novel type of quantum key distribution (QKD) protocol, called DPS (differential-phase-shift) QKD, was proposed several years ago. A sender transmits a highly-attenuated coherent pulse train with {0, π} phase, and a receiver receives it with a one-bit delay Mach-Zehnder interferometer followed by photon detectors. A secret key is created from photon detection events, whose security is based on the fact that an eavesdropper cannot perfectly measure the phase information of a highly-attenuated coherent pulse train. This protocol has some features of simple setup, potential for a high key creation rate, and robustness against photon-number-splitting attack. This paper overviews DPS-QKD. The operation mechanism is described, and then some experimental efforts are introduced, featuring use of a glass waveguide Mach-Zehnder interferometer and advanced single-photon detectors. The highest key rate and the longest distance have been achieved with the DPS-QKD protocol. Some modified schemes are also presented, including that utilizing quantum entanglement, that using decoy pulses, and that using macroscopic coherent light.

Citation Download Citation

Kyo Inoue, Hiroki Takesue, and Toshimori Honjo "Differential-phase-shift quantum key distribution", Proc. SPIE 6780, Quantum Communications Realized, 678015 (10 September 2007); https://doi.org/10.1117/12.733442

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