Open AccessLong-distance entanglement-based quantum key distribution experiment using practical detectors
Author(s) -
Hiroki Takesue,
K. Harada,
Kiyoshi Tamaki,
Hiroshi Fukuda,
Tai Tsuchizawa,
T. Watanabe,
Koji Yamada,
S. Itabashi
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.016777
Subject(s) - quantum key distribution , avalanche photodiode , quantum entanglement , detector , optics , photon , physics , photon entanglement , quantum cryptography , key (lock) , quantum channel , computer science , key generation , qubit , quantum , quantum information , cryptography , quantum mechanics , algorithm , computer security
We report an entanglement-based quantum key distribution experiment that we performed over 100 km of optical fiber using a practical source and detectors. We used a silicon-based photon-pair source that generated high-purity time-bin entangled photons, and high-speed single photon detectors based on InGaAs/InP avalanche photodiodes with the sinusoidal gating technique. To calculate the secure key rate, we employed a security proof that validated the use of practical detectors. As a result, we confirmed the successful generation of sifted keys over 100 km of optical fiber with a key rate of 4.8 bit/s and an error rate of 9.1%, with which we can distill secure keys with a key rate of 0.15 bit/s.