Differential-phase-shift quantum key distribution experiment using fast physical random bit generator with chaotic semiconductor lasers
Toshimori Honjo, Atsushi Uchida, Kazuya Amano, Kunihito Hirano, Hiroyuki Someya, Haruka Okumura, Kazuyuki Yoshimura, Peter T. Davis, Y. Tokura · Optics Express · 2009
A high speed physical random bit generator is applied for the first time to a gigahertz clocked quantum key distribution system. Random phase-modulation in a differential-phase-shift quantum key distribution (DPS-QKD) system is performed using a 1-Gbps random bit signal which is generated by a physical random bit generator with chaotic semiconductor lasers. Stable operation is demonstrated for over one hour, and sifted keys are successfully generated at a rate of 9.0 kbps with a quantum bit error rate of 3.2% after 25-km fiber transmission.