Song Guo-Zhu, Wu Fang-Zhou, Zhang Mei, Yang Guo-Jian
Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Sci Rep. 2016 Jun 28;6:28744. doi: 10.1038/srep28744.
Quantum repeater is the key element in quantum communication and quantum information processing. Here, we investigate the possibility of achieving a heralded quantum repeater based on the scattering of photons off single emitters in one-dimensional waveguides. We design the compact quantum circuits for nonlocal entanglement generation, entanglement swapping, and entanglement purification, and discuss the feasibility of our protocols with current experimental technology. In our scheme, we use a parametric down-conversion source instead of ideal single-photon sources to realize the heralded quantum repeater. Moreover, our protocols can turn faulty events into the detection of photon polarization, and the fidelity can reach 100% in principle. Our scheme is attractive and scalable, since it can be realized with artificial solid-state quantum systems. With developed experimental technique on controlling emitter-waveguide systems, the repeater may be very useful in long-distance quantum communication.
量子中继器是量子通信和量子信息处理中的关键元件。在此，我们研究基于一维波导中单个发射器对光子的散射来实现一个有 herald 信号的量子中继器的可能性。我们设计用于非局域纠缠生成、纠缠交换和纠缠纯化的紧凑型量子电路，并讨论我们的协议在当前实验技术下的可行性。在我们的方案中，我们使用参量下转换源而非理想单光子源来实现有 herald 信号的量子中继器。此外，我们的协议可以将错误事件转化为光子偏振检测，并且保真度原则上可以达到 100%。我们的方案具有吸引力且可扩展，因为它可以用人工固态量子系统来实现。随着在控制发射器 - 波导系统方面实验技术的发展，该中继器在长距离量子通信中可能会非常有用。
