对自由空间光通信的贡献：在量子通信中利用切伦科夫望远镜作为接收器和光束漂移校正的可行性
Contributions to free-space optical communications: feasibility of utilizing Cherenkov telescopes as receivers and beam-wander correction in quantum communications
摘要：
本论文主要研究了自由空间光通信的两大应用：行星际通信和量子通信。因此，本文分为两部分。在第一个，一个新的建议，建议关于使用切伦科夫望远镜作为地面站接收器。一项可行性研究探讨了使用为伽马射线望远镜开发的技术的可能性，伽马射线望远镜将构成切伦科夫望远镜阵列，用于建立一种新型地面站。这些望远镜提供的主要优势之一是需要更大的孔径来克服地基伽马射线天文学和深空光学通信都具有的功率限制。此外，将为CTA建造的大量大型望远镜将有可能通过经济规模生产来降低单位成本。论文的第二部分主要研究自由空间量子密钥分发（QKD）技术。该技术提供了一种理论上安全的方式来在不安全的信道上进行通信，因为可以检测到最终窃听者的存在。自由空间QKD的主要挑战是需要在强大气湍流和日光背景噪声下工作。为了减轻这些影响，在设计接收器的光学器件时通常需要权衡，因为窄视场改善了背景噪声抑制，但增加了与相干性相关的损耗，而宽视场产生相反的效果。提出了一种大气湍流校正系统，同时克服了这两种限制，并对不同的策略进行了分析和实验，实现了在QKD系统中的集成。
英文摘要：
This thesis focuses on the two main applications where free-space optical communication (FSOC) can bring the most significant impact: interplanetary communications and quantum communications. Consequently, the dissertation is structured in two sections. In the first one, a novel proposal is suggested regarding to using Cherenkov telescopes as ground-station receivers. A feasibility study addresses the posibility of using the technology developed for the gamma-ray telescopes that will make up the Cherenkov Telescope Array (CTA) in the implementation of a new kind of ground station. Among the main advantages that these telescopes provide are the much larger apertures needed to overcome the power limitation that ground-based gamma-ray astronomy and deep-space optical communication both have. Also, the large number of big telescopes that will be built for CTA will make it possible to reduce unitary costs by economy-scale production. The second section of the thesis is framed in the field of free-space Quantum Key Distribution (QKD), which has become a new paradigm in the discipline of information security. This technique offers a theoretically-secure way to communicate over an insecure channel since the presence of an eventual eavesdropper can be detected. The main challenge of Free-space QKD is the need to operate both under strong atmospheric turbulence and daylight background noise. To mitigate these effects, a trade-off is usually required when designing the receiver's optics, since a narrow field-of-view improves background noise rejection, but increases turbulence-related losses and a wide field-of-view produces the opposite effect. A correction system for atmospheric turbulence is proposed to overcome both limitations at the same time, and different strategies are analyzed and experimented to carry out the implementation and integration within the QKD system.
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。
