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Conferences > IQEC > 2009 > ITuI > ITuI4
  • Conference on Lasers and Electro-Optics/International Quantum Electronics Conference
  • OSA Technical Digest (CD) (Optica Publishing Group, 2009),
  • paper ITuI4
  • •https://doi.org/10.1364/IQEC.2009.ITuI4

Differential-quadrature-phase-shift (DQPS) quantum key distribution

Kyo Inoue, Yuuki Iwai, Tatsuya Kukita, and Toshimori Honjo

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Abstract

A quantum key distribution (QKD) scheme named differential-quadrature-phase-shift (DQPS) QKD is presented. A transmitter sends a weak coherent pulse train with a phase of {0, π}{ π/2. 3π /2} for each pulse, and a receiver measures it with either one of two delay interferometers respectively having bias phases of 0 and π/2. The scheme introduces the idea of the BB84 protocol into differential-phase-shift (DPS) QKD, making the system robust against a sequential attack, and may guarantee the unconditional security as in BB84.

© 2009 Optical Society of America

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