Quantum key distribution for 10 Gb/s dense wavelength division multiplexing networks

摘要

We demonstrate quantum key distribution (QKD) with bidirectional 10 Gb/sclassical data channels in a single fiber using dense wavelength divisionmultiplexing. Record secure key rates of 2.38 Mbps and fiber distances up to 70km are achieved. Data channels are simultaneously monitored for error-freeoperation. The robustness of QKD is further demonstrated with a secure key rateof 445 kbps over 25 km, obtained in the presence of data lasers launchingconventional 0 dBm power. We discuss the fundamental limit for the QKDperformance in the multiplexing environment.