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RESEARCH HIGHLIGHT: Drastic increase of key rate in continuous-variable quantum key distribution using multimode states and non-Gaussian operations

机译：研究重点:关键利率的急剧增加在无级变速量子密钥分发利用多模态和非高斯操作

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摘要

Quantum cryptography provides information-theoretic security via the laws of physics, and it has attracted much attention recently. Continuous-variable quantum key distribution (CVQKD) has garnered great interest over the past decade because CV QKD has the advantage of "off-the-shelf" technology based on efficient homodyne (or heterodyne) detectors, and the fact that CV QKD protocols potentially provide a realistic route to high QKD key rates. Thus, increasing the secret key rate and the transmission distance of CV-QKD protocols are topics of much ongoing research. It has been shown in various nonoptimized CV-QKD protocols that non-Gaussian operations, such as photon subtraction, can improve the QKD key rate. However, for "single-mode" entanglement-based CV-QKD schemes where entanglement is shared between two singlemodes only, when the squeezing of the input state is optimized to loss conditions, non-Gaussian operations do not provide higher QKD key rates than those schemes without non-Gaussian operations. Instead, "multimode" entanglement-based CV-QKD schemes (where entanglement is shared between more than two single modes) can provide an alternative route to obtain higher QKD key rates.
机译：量子密码学提供了信息理论安全通过的法律物理学,它吸引了大量关注最近。分布(CVQKD)已经获得了极大的兴趣在过去的十年中,因为简历QKD有“现成的”技术基础上的优势有效的零差(或外差)探测器简历QKD协议可能的事实提供一个现实的途径高QKD关键利率。因此,增加了密钥率和CV-QKD协议的传输距离正在进行的研究的主题。所示各种可行CV-QKD协议非高斯操作,如光子减法,可以改善QKD关键利率。然而,对于“单模”entanglement-basedCV-QKD方案共享纠缠两个单模,当挤压输入状态优化的损失条件下,非高斯操作不会提供更高的QKD关键利率比计划没有非高斯操作。“多模”entanglement-based CV-QKD方案(纠缠是超过之间共享两种单模式)可以提供另一种选择获得更高的QKD关键利率。

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