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Continuous-variable measurement-device-independent quantum key distribution using squeezed states

A continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol using squeezed states is proposed where the two legitimate partners send Gaussian-modulated squeezed states to an untrusted third party to realize the measurement. Security analysis shows that the protocol can not only defend all detector side channels, but also attain higher secret key rates than the coherent-state-based protocol. We also present a method to improve the squeezed-state CV-MDI QKD protocol by adding proper Gaussian noise to the reconciliation side. It is found that there is an optimal added noise to optimize the performance of the protocol in terms of both key rates and maximal transmission distances. The resulting protocol shows the potential of long-distance secure communication using the CV-MDI QKD protocol.

preprint2014arXivOpen access
Yi-Chen ZhangZhengyu LiSong YuWanyi GuXiang PengHong Guo
quant-ph
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Open access6 authors1 topic
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Yi-Chen ZhangZhengyu LiSong YuWanyi GuXiang PengHong Guo

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