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Phys. Rev. Lett. 89, 037902 (2002) [3 pages]

Differential Phase Shift Quantum Key Distribution

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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†
E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4085

Received 30 October 2001; revised 25 March 2002; published 27 June 2002

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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.037902
DOI:
10.1103/PhysRevLett.89.037902
PACS:
03.67.Dd, 42.50.Dv

*Electronic address: kyo@will.brl.ntt.co.jp

†Also at NTT Basic Research Laboratories.

 
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