Heralded-qubit amplifiers for practical device-independent quantum key distribution
Heralded-qubit amplifiers for practical device-independent quantum key distribution
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DOI：
10.1103/physreva.84.010304
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发表时间：
2011-07-27
影响因子：
2.9
通讯作者：
Moroder, Tobias
中科院分区：
文献类型：
--
作者：
Curty, Marcos;Moroder, Tobias
与设备无关的量子密钥分配不需要精确的量子力学模型来保证安全性。尽管它很漂亮，但它仍然是一个非常具有挑战性的实验任务。我们比较了最近的建议，吉辛等人。[物理。105，070501（2010）]，以利用基于与线性光学的纠缠交换的更简单的量子中继来关闭检测漏洞问题。我们对这两种方案的全模式分析证实，与最近的信念相反，第二种方案确实可以提供一个积极的关键率，甚至比第一种方案高得多。然而，这两种方案的密钥速率和所需的检测效率约为95%，这在很大程度上取决于底层的安全证明。
Device-independent quantum key distribution does not need a precise quantum mechanical model of employed devices to guarantee security. Despite its beauty, it is still a very challenging experimental task. We compare a recent proposal by Gisin et al. [Phys. Rev. Lett. 105, 070501 (2010)] to close the detection loophole problem with that of a simpler quantum relay based on entanglement swapping with linear optics. Our full-mode analysis for both schemes confirms that, in contrast to recent beliefs, the second scheme can indeed provide a positive key rate which is even considerably higher than that of the first alternative. The resulting key rates and required detection efficiencies of approximately 95% for both schemes, however, strongly depend on the underlying security proof.