光子多自由度的耦合及应用研究

光子体系在量子信息学中扮演着重要角色，大部分量子信息方案都是基于光子体系的。目前人们对光子体系的实验研究，主要是集中在单一自由度上，如光子偏振、角动量等，而无法充分利用光子携带的全部信息，造成量子资源的极大浪费。该项目拟在以前的研究基础上，开展光子多自由度之间的耦合及应用研究，针对光子不同自由度的特点，开展三方面的研究：1）研究二维偏振自由度-连续频率自由度的耦合，实现从环境中提取量子纠缠；2）研究高维-高维自由度耦合，实现高维纠缠态识别；3）研究高维-二维自由度耦合下的量子信息基本问题等。该项目的顺利实施，将为高效的光量子通信打下坚实基础，并促进光子与其他体系的相互作用方面的研究工作。

Photons play an important role in the field of quantum information, since most protocols of quantum information were demonstrated using photons. However, previous experiments mainly focused on single degree of freedom of photons, such as, polarization or orbital angular momentum, and cannot utilize all the information that photons contained. This project will focus on the coupling between deferent degrees of freedom (DOF) of photons, and contains the following three contents: 1) polarization-frequency coupling, and distills quantum entanglement from environment; 2) coupling between high-dimensional DOF and high-dimensional DOF, and realizes the complete determination of high-dimensional entanglement states; 3) coupling between high-dimensional DOF and two-dimensional DOF. This project will enhance the application of efficient optical quantum communication and stimulate the researching on the coupling between different systems.