Reverse-reconciliation continuous-variable quantum key distribution based on the uncertainty principle
Reverse-reconciliation continuous-variable quantum key distribution based on the uncertainty principle
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DOI：
10.1103/physreva.90.042325
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发表时间：
2014-10-21
影响因子：
2.9
通讯作者：
Furrer, Fabian
中科院分区：
文献类型：
--
作者：
Furrer, Fabian
连续变量量子密钥分配的一个巨大挑战是证明其安全性，以抵御包括有限尺寸效应等现实假设在内的任意相干攻击。最近，这样的证明已提交[物理学评论快报。109，100502（2012）]，用于基于与量子存储器的新型不确定性关系的双模压缩态协议。但由于直接和解协议，传输距离相当有限。我们在这里证明了安全性对相干攻击的反向和解协议在类似的假设下，但允许超过16公里的实验可行的参数的距离。进一步阐明了在连续变量量子密钥分配的安全性证明中使用量子存储器的测不准关系的局限性。
A big challenge in continuous-variable quantum key distribution is to prove security against arbitrary coherent attacks including realistic assumptions such as finite-size effects. Recently, such a proof has been presented in [Phys. Rev. Lett. 109, 100502 (2012)] for a two-mode squeezed state protocol based on a novel uncertainty relation with quantum memories. But the transmission distances were fairly limited due to a direct reconciliation protocol. We prove here security against coherent attacks of a reverse-reconciliation protocol under similar assumptions but allowing distances of over 16 km for experimentally feasible parameters. We further clarify the limitations when using the uncertainty relation with quantum memories in security proofs of continuous-variable quantum key distribution.