Gaussian entanglement for quantum key distribution from a single-mode squeezing source
Gaussian entanglement for quantum key distribution from a single-mode squeezing source
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DOI：
10.1088/1367-2630/15/5/053049
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发表时间：
2011-10
影响因子：
3.3
通讯作者：
T. Eberle;V. Händchen;J. Duhme;T. Franz;F. Furrer;R. Schnabel;R. Werner
中科院分区：
文献类型：
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作者：
T. Eberle;V. Händchen;J. Duhme;T. Franz;F. Furrer;R. Schnabel;R. Werner
我们报道了在1550 nm波长下的Einstein-Podolsky-罗森纠缠源对高斯连续变量量子密钥分配的适用性。我们的源是基于一个单一的连续波压缩真空模式结合真空模式在平衡分束器。扩展最近的安全性证明，我们通过量化的可组合的安全密钥的提取长度从有限数量的样本的假设下的集体攻击的来源。我们表明，在10公里的顺序的距离是可以实现的，这个源的一个合理的样本大小，尽管事实上，产生的纠缠，包括真空模式。我们的安全性分析适用于所有具有不对称性的领域正交方差，包括由两个压缩模式具有不同的压缩强度叠加产生的状态。
We report the suitability of an Einstein–Podolsky–Rosen entanglement source for Gaussian continuous-variable quantum key distribution at 1550 nm. Our source is based on a single continuous-wave squeezed vacuum mode combined with a vacuum mode at a balanced beam splitter. Extending a recent security proof, we characterize the source by quantifying the extractable length of a composable secure key from a finite number of samples under the assumption of collective attacks. We show that distances in the order of 10 km are achievable with this source for a reasonable sample size despite the fact that the entanglement was generated including a vacuum mode. Our security analysis applies to all states having an asymmetry in the field quadrature variances, including those generated by superposition of two squeezed modes with different squeezing strengths.