2 GHz clock quantum key distribution over 260 km of standard telecom fiber.
2 GHz clock quantum key distribution over 260 km of standard telecom fiber.
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DOI：
10.1364/ol.37.001008
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发表时间：
2012-03
期刊：
影响因子：
3.6
通讯作者：
Shuang Wang;Wei Chen;Junqing Guo;Z. Yin;Hongwei Li;Zheng-Wei Zhou;G. Guo;Z. Han
中科院分区：
文献类型：
--
作者：
Shuang Wang;Wei Chen;Junqing Guo;Z. Yin;Hongwei Li;Zheng-Wei Zhou;G. Guo;Z. Han
我们报告的量子密钥分配（QKD）的标准电信光纤超过50分贝的损失和250公里的长度的演示。选择差分相移QKD协议并以2GHz系统时钟速率实现。通过对1比特延迟法拉第-迈克尔逊干涉仪的优化设计和超导单光子探测器的使用，在光纤长度不超过205 km时，量子误码率低于2%，在260 km光纤中，量子误码率为3.45%，损耗为52.9 dB。我们还提高了SSPD的量子效率，以获得50公里长的高密钥速率。
We report a demonstration of quantum key distribution (QKD) over a standard telecom fiber exceeding 50 dB in loss and 250 km in length. The differential phase shift QKD protocol was chosen and implemented with a 2 GHz system clock rate. By careful optimization of the 1 bit delayed Faraday-Michelson interferometer and the use of the superconducting single photon detector (SSPD), we achieved a quantum bit error rate below 2% when the fiber length was no more than 205 km, and of 3.45% for a 260 km fiber with 52.9 dB loss. We also improved the quantum efficiency of SSPD to obtain a high key rate for 50 km length.