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Afterpulse-like phenomenon of superconducting single photon detector in high speed quantum key distribution system
2011
Optics Express
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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
doi:10.1364/oe.19.019562
pmid:21996897
fatcat:nficnp53yzdldm6u5tz2qqtdqi