Polarization-independent, differential-phase-shift, quantum-key distribution system using upconversion detectors.
We propose and demonstrate a polarization-independent, differential-phase-shift, quantum-key distribution system with upconversion detectors. Even though the detectors have polarization dependency, use of alternative polarization modulation and a two-bit delay interferometer achieves polarization-insensitive operation. In an experiment, sifted key bits were polarization-independently generated over 50 km fiber.
Iwai
Yuki
Y
Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Honjo
Toshimori
T
Inoue
Kyo
K
Kamada
Hidehiko
H
Nishida
Yoshiki
Y
Tadanaga
Osamu
O
Asobe
Masaki
M