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Proceedings Paper

Differential-phase-shift quantum key distribution
Author(s): Kyo Inoue; Hiroki Takesue; Toshimori Honjo
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Paper 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.

Paper Details

Date Published: 10 September 2007
PDF: 9 pages
Proc. SPIE 6780, Quantum Communications Realized, 678015 (10 September 2007); doi: 10.1117/12.733442
Show Author Affiliations
Kyo Inoue, Osaka Univ. (Japan)
NTT Corp. (Japan)
Hiroki Takesue, NTT Corp. (Japan)
Toshimori Honjo, NTT Corp. (Japan)

Published in SPIE Proceedings Vol. 6780:
Quantum Communications Realized
Yasuhiko Arakawa; Masahide Sasaki; Hideyuki Sotobayashi, Editor(s)

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