Decoy state quantum key distribution with a photon number resolved heralded single photon source
Decoy state quantum key distribution with a photon number resolved heralded single photon source
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DOI：
10.1103/physreva.73.032331
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发表时间：
2006-03
影响因子：
2.9
通讯作者：
T. Horikiri;Takayoshi Kobayashi
中科院分区：
文献类型：
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作者：
T. Horikiri;Takayoshi Kobayashi
近年来，利用诱饵态法的思想，实现了长距离、高密钥速率的量子密钥分发。我们证明了利用预告单光子源(利用自发参数下转换)代替原来的诱饵态方法中提出的弱相干脉冲(WCP)作为源，可以实现更远距离的量子密钥分配。此外，通过利用目前可用的光子数分辨探测器作为预告单光子源的触发探测器，提高了关键率，并且接近WCP的关键率。
Recently a long distance and high key rate quantum key distribution (QKD) has become possible by the idea of the decoy state method. We show that a longer distance QKD is possible by utilizing a heralded single photon source (utilizing spontaneous parametric down-conversion) as a source instead of a weak coherent pulse (WCP) as proposed in the original decoy state method. Moreover, the key rate is improved by utilizing a presently available photon number resolving detector as a trigger detector of the heralded single photon source and it is shown to approach the key rate of the WCP.