Differential Phase Shift Quantum Key Distribution

Kyo Inoue; Edo Waks; Yoshihisa Yamamoto

doi:10.1103/PhysRevLett.89.037902

Differential Phase Shift Quantum Key Distribution

Kyo Inoue, Edo Waks, and Yoshihisa Yamamoto

Phys. Rev. Lett. 89, 037902 – Published 27 June 2002

Abstract

A novel quantum cryptography scheme is proposed, in which a single photon is prepared in a linear superposition state of three basis kets. A photon split to three pulses is sent from Alice to Bob, where the phase difference between sequential two pulses carries bit information. Bob measures the phase difference by passive differential phase detection. This scheme is suitable for fiber transmission systems and offers a key creation efficiency higher than conventional fiber-based BB84.

Received 30 October 2001

DOI:https://doi.org/10.1103/PhysRevLett.89.037902

Authors & Affiliations

Kyo Inoue^*

NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, 243-0198 Japan
and E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4085

Edo Waks and Yoshihisa Yamamoto^†