Afterpulse-like phenomenon of superconducting single photon detector in high speed quantum key distribution system

We discuss our estimates of the performance of a superconducting single photon detector (SSPD) in a high speed quantum key distribution (QKD) system. We find that at high repetition operation reflections from the readout circuit at room temperature causes an afterpulse-like phenomenon, and drastical...

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Bibliographic Details
Published in:Optics express 2011-09, Vol.19 (20), p.19562-19571
Main Authors: Fujiwara, M, Tanaka, A, Takahashi, S, Yoshino, K, Nambu, Y, Tajima, A, Miki, S, Yamashita, T, Wang, Z, Tomita, A, Sasaki, M
Format: Article
Language:English
Subjects:
Amplifiers, Electronic
Computer Simulation
Equipment Design
Fiber Optic Technology
Photons
Quantum Theory
Signal Processing, Computer-Assisted - instrumentation
Telecommunications - instrumentation
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Summary:We discuss our estimates of the performance of a superconducting single photon detector (SSPD) in a high speed quantum key distribution (QKD) system. We find that at high repetition operation reflections from the readout circuit at room temperature causes an afterpulse-like phenomenon, and drastically increases the quantum bit error rate (QBER). Such effects are not seen during low frequency operation. By using an amplifier with a small reflection coefficient S11, we succeed in reducing the afterpulse-like phenomenon and increasing a secure key rate.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.19.019562