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2.23 GHz gating InGaAs/InP single-photon avalanche diode for quantum key distribution

机译:2.23 GHz选通InGaAs / InP单光子雪崩二极管,用于量子密钥分配

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We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with the fastest gating frequency reported so far, of 2.23 GHz, which approaches the limit given by the bandwidth of the SPAD - 2.5 GHz. We propose a useful way to characterize the afterpulsing distribution for rapid gating that allows for easy comparison with conventional gating regimes. We compare the performance of this rapid gating scheme with free-running detector and superconducting single-photon detector (SSPD) for the coherent one-way quantum key distribution (QKD) protocol. The rapid gating system is well suited for both high-rate and long-distance QKD applications, in which Mbps key rates can be achieved for distances less than 40 km with 50 ns deadtime and the maximum distance is limited to ~190km with 5μs deadtime. These results illustrate that the afterpulsing is no longer a limiting factor for QKD.
机译:我们实现了一个InGaAs / InP单光子雪崩二极管(SPAD),用于单光子检测,迄今为止报道的最快门控频率为2.23 GHz,接近SPAD带宽给出的极限-2.5 GHz。我们提出了一种有用的方法来表征快速门控的后脉冲分布,该方法可轻松与常规门控方案进行比较。我们将这种快速门控方案与自由运行探测器和超导单光子探测器(SSPD)的相干单向量子密钥分配(QKD)协议的性能进行了比较。该快速门控系统非常适合高速率和长距离QKD应用,在这种情况下,死区时间为50 ns时,距离小于40 km时,可以实现Mbps密钥速率;死区时间为5μs时,最大距离限制为〜190 km。这些结果说明,后脉冲不再是QKD的限制因素。

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