Field test of quantum key distribution in the Tokyo QKD Network
  A novel secure communication network with quantum key distribution in a metropolitan area is reported. Different QKD schemes are integrated to demonstrate secure TV conferencing over a distance of 45km, stable long-term operation, and application to secure mobile phones. 
M. Sasaki, M. Fujiwara, H. Ishizuka, W. Klaus, K. Wakui, M. Takeoka,   A. Tanaka, K. Yoshino, Y. Nambu, S. Takahashi, A. Taj...
quant-ph