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Free-running InGaAs single photon detector with 1 dark count per second at 10% efficiency

Published inApplied physics letters, vol. 104, no. 8, 081108
Publication date2014
Abstract

We present a free-running single photon detector for telecom wavelengths based on a negative feedback avalanche photodiode (NFAD). A dark count rate as low as 1 cps was obtained at a detection efficiency of 10%, with an afterpulse probability of 2.2% for 20 μs of deadtime. This was achieved by using an active hold-off circuit and cooling the NFAD with a free-piston stirling cooler down to temperatures of −110 °C. We integrated two detectors into a practical, 625 MHz clocked quantum key distribution system. Stable, real-time key distribution in the presence of 30 dB channel loss was possible, yielding a secret key rate of 350 bps.

Citation (ISO format)
KORZH, Boris et al. Free-running InGaAs single photon detector with 1 dark count per second at 10% efficiency. In: Applied physics letters, 2014, vol. 104, n° 8, p. 081108. doi: 10.1063/1.4866582
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ISSN of the journal0003-6951
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