Proposal for Slepian-States-Based DV- and CV-QKD Schemes Suitable for Implementation in Integrated Photonics Platforms
Proposal for Slepian-States-Based DV- and CV-QKD Schemes Suitable for Implementation in Integrated Photonics Platforms
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DOI：
10.1109/jphot.2019.2923749
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发表时间：
2019-08-01
影响因子：
2.4
通讯作者：
Djordjevic, Ivan B.
中科院分区：
文献类型：
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作者：
Djordjevic, Ivan B.
量子密钥分发（QKD）利用量子力学的基本原理来实现具有可验证安全性的密钥分发。尽管QKD具有吸引人的特点，但在其广泛应用之前，还需要解决一些基本和技术挑战。首先，QKD密钥速率（SKR）从根本上受到信道损耗的限制，这是由速率损耗权衡决定的。量子中继器将是克服这个问题的最终解决方案;然而，它们远远超出了可及范围。第二个挑战在于可扩展性和成本。未来的QKD系统必须适合大规模生产，具有低成本，可靠的免校准操作和低功耗。为了同时解决这些问题，我们提出在正交Slepian序列的基础上编码信息。这种方法对于自由空间光链路中的湍流效应和光纤信道中的色散效应/光纤非线性是高度鲁棒的，从而改善QKD距离。此外，利用多维编码空间实现高频谱效率QKD，使得SKR可以显著改善。关键的是，Slepian态的产生、处理和检测可以在基于反射和透射波导布拉格光栅（WBG）的集成量子光子学平台中可靠地实现。所提出的基于反射/透射WBG的Slepian态适用于离散变量和连续变量QKD系统。
Quantum key distribution (QKD) leverages underlying principles of quantum mechanics to realize distribution of keys with verifiable security. Despite appealing features of QKD, there are some fundamental and technical challenges that need to be solved prior to its widespread applications. First, QKD secret-key rate (SKR) is fundamentally limited by channel loss, as dictated by the rate-loss tradeoff. Quantum repeaters would be an ultimate solution to overcome this problem; however, they are well beyond the reach. The second challenge lies in the scalability and cost. Future's QKD systems must be suitable for mass production with low cost, reliable realignment-free operations, and small power consumption. To solve for these problems in a simultaneous manner, we propose to encode information in the orthogonal Slepian sequences' bases. Such an approach is highly robust against turbulence effects in free-space optical links and dispersion effects/fiber non-linearities in fiber-optics channels, thereby improving QKD distance. Moreover, exploiting multidimensional encoding space enables high spectral efficiency QKD so that the SKR can be significantly improved. Critically, generation, processing, and detection of Slepian states can be reliably implemented in an integrated quantum photonics platform, based on both reflective and transmissive waveguide Bragg gratings (WBGs). Proposed reflective/transmissive WBG-based Slepian states are applicable to both discrete variable and continuous variable QKD systems.