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arXiv 1902.09175quant-phcs.ITmath.IT
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地-星信道CV-QKD的光子工程

Photonic Engineering for CV-QKD over Earth-Satellite Channels

Mingjian He, Robert Malaney, Jonathan Green

摘要:

通过卫星的量子密钥分发(QKD)提供了在全球范围内无条件安全通信的可能性。在这样的系统中,通过光子工程在源头上增加秘密密钥速率,是许多正在进行的研究的主题。在这项工作中,我们研究了使用光子添加状态和光子减去状态,来自双模压缩真空状态,作为这样的光子工程的例子。具体来说,我们确定工程光子状态提供更好的QKD性能时,实现在连接地面接收器与低地球轨道卫星的通道。我们量化了增加或减少的光子数量的影响,并强调了所采用的大气湍流和损失模型对预测关键速率的作用。我们的研究结果提出的部署的复杂性,最简单的部署忽略任何估计的信道,和更复杂的部署涉及一个反馈回路,用于优化每个信道估计的关键速率。最佳的量子态被确定为每个部署方案调查。

英文摘要:

Quantum Key Distribution (QKD) via satellite offers up the possibility of unconditionally secure communications on a global scale. Increasing the secret key rate in such systems, via photonic engineering at the source, is a topic of much ongoing research. In this work we investigate the use of photon-added states and photon-subtracted states, derived from two mode squeezed vacuum states, as examples of such photonic engineering. Specifically, we determine which engineered-photonic state provides for better QKD performance when implemented over channels connecting terrestrial receivers with Low-Earth-Orbit satellites. We quantify the impact the number of photons that are added or subtracted has, and highlight the role played by the adopted model for atmospheric turbulence and loss on the predicted key rates. Our results are presented in terms of the complexity of deployment used, with the simplest deployments ignoring any estimate of the channel, and the more sophisticated deployments involving a feedback loop that is used to optimize the key rate for each channel estimation. The optimal quantum state is identified for each deployment scenario investigated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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