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Long-distance continuous-variable measurement-device-independent quantum key distribution with postselection
Physical Review Research Pub Date : 2020-09-16 , DOI: 10.1103/physrevresearch.2.033424
Kieran N. Wilkinson , Panagiotis Papanastasiou , Carlo Ottaviani , Tobias Gehring , Stefano Pirandola

We introduce a robust scheme for long-distance continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution in which we employ postselection between distant parties communicating through the medium of an untrusted relay. We perform a security analysis that allows for general transmissivity and thermal noise variance of each link, in which we assume that an eavesdropper performs a collective attack and controls the excess thermal noise in the channels. The introduction of postselection enables the parties to sustain a secret key rate over distances exceeding those of existing CV MDI protocols. In the worst-case scenario in which the relay is positioned equidistant between them, we find that the parties may communicate securely over a range of 14 km in standard optical fiber. Our protocol helps to overcome the rate-distance limitations of previously proposed CV MDI protocols while maintaining many of their advantages.

中文翻译:

具有后选功能的长距离连续可变的独立于测量设备的量子密钥分配

我们为长距离连续变量(CV)与测量设备无关(MDI)量子密钥分配引入了一种健壮的方案,在该方案中,我们采用了通过不受信任的中继介质进行通信的远方之间的后选。我们执行安全性分析,考虑到每个链路的一般透射率和热噪声方差,我们假设窃听者执行集体攻击并控制通道中的多余热噪声。后选择的引入使双方能够在超过现有CV MDI协议的距离范围内维持秘密密钥率。在继电器之间等距放置的最坏情况下,我们发现当事方可以在标准光纤的14 km范围内安全通信。
更新日期:2020-09-16
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