Plug & Play Quantum Key Distribution Using Modulation Sidebands for Shifting Frequency
Toshimori Honjo, Kyo Inoue · Japanese Journal of Applied Physics · 2005
A Plug & Play quantum key distribution (QKD) system operating at a high pulse repetition frequency is presented. To avoid Rayleigh backscattering, modulation sidebands are used as frequency-shifted light. As the pulse repetition frequency increases, the quantum bit-error rate (QBER) in our proposed setup remains constant, while it increases in a conventional setup, which indicates that Plug & Play QKD at a high repetition frequency is possible with our scheme.