Enhanced single photon fringe visibility in a 10 km-long prototype quantum cryptography channel
Paul D. Townsend, A. Ougazzaden, P. R. Tapster · Electronics Letters · 1993
High visibility (V = 0.985) single photon fringe measurements in a 10 km long, optical fibre-based, time- and polarisation-division Mach-Zehnder interferometer are reported. The ability of the system to transmit key data in a quantum cryptography scheme is assessed.