多光子高维量子纠缠操纵研究

To expand the dimension of Hilbert space, in which quantum information tasks are performed, there are two directions: increasing the number of fully-controlled entangled qubits and dimension of one degree of freedom. Based on linear optical system, this project will move along the two directions. On the one hand, we will keep on optimizing the entanglement source in 10-photon entanglement, dissolving correlation of frequency and building perfect entanglement source up till now, try our best to generate 12-photon entanglement state, ensuring our world records of maximum number of entangled photons. On the other hand, we will develop technologies of manipulating high-dimensional quantum state, breaking through qutrit manipulation in single degree of freedom, and accomplish generation of arbitrary two-photon qutrit entanglement state. Further more, we will study the application in quantum computation, quantum simulation, quantum network and quantum principle test with these new entangled sources. The research of generation and manipulation of multiphoton high-dimensional entanglement state is fundamental and prospective. Successful implementation of this project will help us to maintain the leading position in the area of optical quantum information processing.

为提高开展量子信息处理所需的Hilbert空间维度，可通过两条途径，一是增加可独立操纵纠缠比特数；二是增加单粒子编码空间的维度。本项目将基于线性光学系统沿着这两条途径继续前进：继续提升可纠缠光子数目，在已经实现十光子纠缠基础上，继续优化纠缠光源，解除光源频率关联，制备新一代完美纠缠源，努力实现十二光子纠缠，旨在继续保持光子纠缠态制备的世界纪录；开展高维光量子态操纵研究，突破光子单自由度qutrit调控，制备任意双光子qutrit纠缠态。进一步探索这些纠缠源在量子计算与量子模拟、量子网络、量子力学基础检验等方面的应用。开展多光子高维纠缠操纵的研究，具有很强的基础性和前瞻性，该研究的顺利实施将有助于继续保持我国在光量子信息处理领域的国际领先地位。

本项目的研究内容和研究目标是：继续提升可纠缠光子数目，在已经实现十光子纠缠基础上，继续优化纠缠光源，解除光源频率关联，制备新一代完美纠缠源，努力实现十二光子纠缠，旨在继续保持光子纠缠态制备的世界纪录；开展高维光量子态操纵研究，突破光子单自由度qutrit调控，制备任意双光子qutrit纠缠态。进一步探索这些纠缠源在量子计算与量子模拟、量子网络、量子力学基础检验等方面的应用。通过本项目的实施，顺利完成了上述目标，取得一系列国际领先科研成果：首次实现高维量子隐形传态，实现基于量子隐形传态的逻辑比特编码，实现利用量子隐形传态读取多体波函数，利用十二光子首次实现全光量子中继，首次实现分布式量子相位估计的实验验证，实现多体纠缠自检测，实现纠缠态的近似量子克隆等。共发表SCI论文16篇，其中包括Nature Photonics 2篇，Physical Review Letters 7篇，PNAS 1篇，Optica 1篇。