NTT Technical Review, December 2004, Vol. 2, No. 12
نویسندگان
چکیده
Quantum cryptography promises to provide communications with unconditional security on the basis of the physical principles of quantum mechanics. We have proposed a quantum key distribution protocol called a differential-phase-shift quantum key distribution (DPS-QKD). This scheme has several advantages including suitability for fiber transmission and highly efficient key generation. In this paper, we review quantum cryptography technologies and then describe our scheme DPS-QKD. In an experiment using a planar lightwave circuit Mach-Zehnder interferometer, DPS-QKD achieved stable polarization-independent operation during 20-km fiber transmission. The raw key creation rate was 3076 bit/s with a 5.0% quantum bit error rate. Differential-phase-shift Quantum Key Distribution † NTT Basic Research Laboratories Atsugi-shi, 243-0198 Japan E-mail: [email protected]
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