基于量子存储的远距离量子隐形传态研究

Quantum teleportation is a new method of information transmission, and is the elementary process of quantum repeaters and future quantum network. In order to achieve an effective quantum repeater, quantum memory technologies are absolutely necessary, because most of the preparation schemes of entangled particles are probabilistic. Quantum teleportation experiments and long-lived quantum memory technologies have been hot research fields of quantum information. The teleportation distance of 16 km has been achieved at present, while the storage lifetime has run up to hundreds of millisecond in the laboratory, which means it has satisfied the requests of practice initially. In this project, we will introduce state-of-the-art quantum memory technologies into the long-distance quantum teleportation experiments for the first time internationally, some important explorations such as simulations of quantum memory based on single-mode optical fibers and based on the interaction between photons and atoms will be carried out. Concurrently, we will explore and develop suitable quantum memory technology for quantum teleportation. And on this basis, communicating parties share entangled particles at first with the quantum memory, then transmitter conducts a joint Bell measurement on the particle to be transmitted and one of the entangled particles storaged locally, thereby the state will be sent to the another particle which belongs to the entangled state at remote receiver terminal invisibly. So, and so only, real long-distance quantum teleportation can be accomplished. Through the implementation of this project, we will further improve the distance and the effciency of quantum teleportation, explore the key technologies of practical quantum repeater, construct the scientific foundation of future quantum communication networks.

量子隐形传态是一种全新的信息传输方式，是量子中继器与未来量子网络基础过程。由于绝大多数纠缠粒子制备方式都是概率性的，只有在量子存储的帮助下才能实现有效的量子中继。量子隐形传态实验和长寿命量子存储技术一直是量子信息领域的研究热点，目前量子隐形传态的实验距离已达到16公里、实验室内量子存储寿命达到百毫秒量级，初步具备了实用化的基础。本项目在国际上首次将量子存储技术引入远距离量子隐形传态实验中，通过对基于单模光纤模拟量子存储、基于光子与原子相互作用的量子存储等方面的研究，探索和发展适合量子隐形传态的量子存储技术；并以此为基础，在量子存储的帮助下通信双方首先共享纠缠粒子后，再将待传送态与其中一个纠缠粒子进行联合Bell测量，从而将其隐形的传送到遥远的另一纠缠粒子上，这是真正意义的远程量子隐形传态。本项目的实施将进一步提高量子隐形传态的距离和效率，探索实用化量子中继关键技术，构筑未来量子网络科学基础

量子隐形传态是一种全新的信息传输方式,是量子中继器与未来量子网络基础过程。由于绝大多数纠缠粒子制备方式都是概率性的,只有在量子存储的帮助下才能实现有效的量子中继。量子隐形传态 实验和长寿命量子存储技术一直是量子信息领域的研究热点,目前量子隐形传态的实验距离已达到百 公里、实验室内量子存储寿命达到百毫秒量级,初步具备了实用化的基础。本项目在国际上首次将量 子存储技术引入远距离量子隐形传态实验中,通过对基于单模光纤模拟量子存储、基于光子与原子相 互作用的量子存储等方面的研究,探索和发展适合量子隐形传态的量子存储技术;并以此为基础,在量子存储的帮助下通信双方首先共享纠缠粒子后,再将待传送态与其中一个纠缠粒子进行联合 Bell 测量,从而将其隐形的传送到遥远的另一纠缠粒子上,这是真正意义的远程量子隐形传态。本项目的发展了自由空间量子存储技术，研制了适合外场应用的量子存储原型系统；发展了高效率量子发射装置，实现了15urad发散角、70％发射效率。本项目的实施为实现真正意义量子隐形传态奠定了重要的技术基础。