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We demonstrate an efficient way to improve the timing jitter of sine-wave gated InGaAs/InP avalanche photo diode (APD) by combining sinusoidally balanced differencing and low-pass filtering techniques to minimize detrimental waveform distortion of the avalanche signal, and realize a 1-GHz gated InGaAs/InP single-photon detector with the timing jitter as low as 60 ps. The detection efficiency could reach 10.4% at 1550 nm with the maximum count rate ~100 MHz, after pulse probability ~3.0%, and dark count rate ~6.1 × 10-6 per gate. Such low timing jitter single-photon detectors offer facility for quantum key distribution at gigahertz clock rate.
Date of Publication: July1, 2011