通过学习实际单光子源的统计信息来提高量子密钥分发
Boosting up quantum key distribution by learning statistics of practical single photon sources
摘要：
本文提出了一种简单的量子密钥分配方案，该方案适用于实际的单光子源（SPS），即使对源的二阶相关$g^{(2)}$有适度的抑制也能工作。该方案利用被动准备的诱饵状态，通过监测的信号的一小部分，通过一个额外的分束器和检测器在发送方监测光子数分裂攻击。我们表明，可实现的距离增加的精度与亚泊松趋势被确认在较高的光子数分布的源，而不是与实际抑制的多光子发射事件。我们提出了一个例子的安全密钥生成率的情况下，一个贫穷的SPS与$g^{(2)} = 0.19$，其中没有安全的密钥与传统的QKD方案产生，并表明，学习光子数分布到几个数字是足以实现几乎相同的可实现的距离作为一个理想的SPS。
英文摘要：
We propose a simple quantum-key-distribution (QKD) scheme for practical single photon sources (SPSs), which works even with a moderate suppression of the second-order correlation $g^{(2)}$ of the source. The scheme utilizes a passive preparation of a decoy state by monitoring a fraction of the signal via an additional beam splitter and a detector at the sender's side to monitor photon number splitting attacks. We show that the achievable distance increases with the precision with which the sub-Poissonian tendency is confirmed in higher photon number distribution of the source, rather than with actual suppression of the multi-photon emission events. We present an example of the secure key generation rate in the case of a poor SPS with $g^{(2)} = 0.19$, in which no secure key is produced with the conventional QKD scheme, and show that learning the photon-number distribution up to several numbers is sufficient for achieving almost the same achievable distance as that of an ideal SPS.
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