In-band quantum key distribution (QKD) on fiber populated by high-speed classical data channels
Tongfei Xia, D.Z. Chen, Glenn A. Wellbrock, Anton Zavriyev, Alan C. Beal, K.M. Lee · 2006
We used a commercial QKD system to conduct key exchange over 50-km fiber span that supported classical 10 Gbit/sec traffic. Both quantum and classical channels were carried by the standard ITU grid C-band wavelengths.