面向卫星平台广域量子通信的超高亮度量子纠缠源实验研究

Quantum Information is an interdisciplinary science between quantum physics and information science, which provides a new way for better understanding of quantum theory. Furthermore, due to its unique advantage in information processing, quantum information rapidly becomes one of the hottest researches in recent years. Quantum entanglement is the core resources in quantum information processing. Because of the important role in the research field of quantum information, the quantum entanlement source has been a hot area of research for many years. In this project,we will gradually carry out the experimental research of a ultra-brightness entanglement source with the goal of application in satellite platforms. Meanwhile we will perform some free-space long-distance experiments based on this new type quantum entanglement source. Through these experiments, we can experimental simulate the process of satellite-to-ground quantum communication. The implementation of this project would developed a valuable approach to increase the flux of entangled photon pairs, which can be served as a step stone towards the satellite-ground quantum communication as well as the real practicalization of the quantum teleportaton, quantum repeater,quantum computation and quntum network.

量子信息是量子物理和信息科学相互结合所产生的交叉学科，为重新认识和理解量子理论提供了新途径。同时由于其在信息处理方面所展现出来的独特优势，使其在近些年迅速发展为学术界的重要研究热点之一。作为量子信息核心资源的量子纠缠，因其反应出的诸多量子理论本质以及在量子通信领域中的重要地位，使得量子纠缠源的研制成为了国内外量子信息科学中最重要的研究方向之一。 本项目逐步开展新一代更高亮度纠缠源的实验研究。并以能够应用于卫星等空间平台为目标，对研制出的量子纠缠源进行更为合理和优化的设计。同时，将以该新型量子纠缠源为基础，开展远距离自由空间实验，模拟星地量子纠缠分发。纠缠源亮度的进一步提升将为基于卫星平台的星地量子通信的早日实现奠定基础，同时也使量子态隐形传输、量子中继、量子计算和量子网络朝向真正的实用化更加迈进一步。

量子纠缠是量子信息的核心资源，可用于量子通信，量子计算，量子模拟及量子精密测量等诸多领域。所以量子纠缠源的研制成为了国内外量子信息科学中最重要的研究方向之一。本项目首先通过理论研究，寻找到发展更高亮度纠缠源新的技术途径，并成功在项目中实践了该技术，研制了新一代超高亮度量子纠缠源，亮度比上一代纠缠源高出近两个数量级，达到10^9 对/s。在此基础上，模拟高信道衰减，在总衰减100dB的情况下，实现量子纠缠分发实验，并成功观测到Bell不等式的破缺。纠缠源亮度的进一步提升为基于中高卫星平台的星地量子通信的早日实现奠定基础,同时也使量子态隐形传输、量子中继、量子计算和量子网络朝向真正的实用化更加迈进一步。