Single-photon Interference over 150 km Transmission Using Silica-based Integrated-optic Interferometers for Quantum Cryptography
Tadamasa KimuraDepartment of Materials Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuda, Yokohama, Kanagawa 226-0026, JapanYoshihiro NambuFundamental and Environmental Research Laboratories, NEC, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, JapanT. HatanakaFiber Optic Devices Division, NEC Corp., 747 Magi, Ohtsukimachi, Ohtsuki, Yamanashi 401-0016, JapanAkihisa TomitaHideo KosakaResearch Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, JapanKazuo NakamuraFundamental and Environmental Research Laboratories, NEC, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan
2004en
ABI
Аннотация
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.
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