Boosting up quantum key distribution by learning statistics of practical single-photon sources
Boosting up quantum key distribution by learning statistics of practical single-photon sources
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DOI：
10.1088/1367-2630/11/11/113033
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发表时间：
2009-09
影响因子：
3.3
通讯作者：
Y. Adachi;Takashi Yamamoto;M. Koashi;N. Imoto
中科院分区：
文献类型：
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作者：
Y. Adachi;Takashi Yamamoto;M. Koashi;N. Imoto
提出了一种简单的单光子源的量子密钥分配方案，该方案在对源的二阶相关系数g（2）进行适度抑制的情况下也能工作。该方案利用被动准备的诱饵状态，通过监测的一部分信号，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产生与传统的QKD方案，并表明，学习光子数分布到几个数字是足够的，以实现几乎相同的距离作为一个理想的SPS。
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 multiphoton 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 distance as that of an ideal SPS.