Title :
Differential-quadrature-phase-shift (DQPS) quantum key distribution
Author :
Inoue, Kyo ; Kukita, Tatsuya ; Iwai, Yuuki ; Honjo, Toshimori
Author_Institution :
Osaka Univ., Suita, Japan
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, pi} {pi/2. 3pi/2} for each pulse, and a receiver measures it with either one of two delay interferometers respectively having bias phases of 0 and pi/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.
Keywords :
cryptographic protocols; differential phase shift keying; quadrature phase shift keying; quantum cryptography; quantum optics; telecommunication security; BB84 protocol; DQPS QKD; coherent pulse train; differential-quadrature-phase-shift keying; quantum key distribution; two-delay interferometer; unconditional security; Delay; Detectors; Interferometers; Optical receivers; Optical transmitters; Phase detection; Protocols; Pulse measurements; Robustness; Security; (270.5565) Quantum Communications; (270.5568) Optical Cryptography;
Conference_Titel :
Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-55752-869-8
Electronic_ISBN :
978-1-55752-869-8
