Single-photon Interference over 150 km Transmission Using Silica-based Integrated-optic Interferometers for Quantum Cryptography
Tadamasa Kimura, Yoshihiro Nambu, T. Hatanaka, Akihisa Tomita, Hideo Kosaka, Kazuo Torii Nakamura · Japanese Journal of Applied Physics · 2004
We have demonstrated single-photon interference over 150 km using time-division interferometers for quantum cryptography, which were composed of two integrated-optic asymmetric Mach-Zehnder interferometers, and balanced gated-mode photon detectors. The observed fringe visibility was more than 80% after 150 km transmission.