Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark.
Phys Rev Lett. 2013 Nov 1;111(18):180502. doi: 10.1103/PhysRevLett.111.180502. Epub 2013 Oct 29.
Noise is the main obstacle for the realization of fault-tolerant quantum information processing and secure communication over long distances. In this work, we propose a communication protocol relying on simple linear optics that optimally protects quantum states from non-Markovian or correlated noise. We implement the protocol experimentally and demonstrate the near-ideal protection of coherent and entangled states in an extremely noisy channel. Since all real-life channels are exhibiting pronounced non-Markovian behavior, the proposed protocol will have immediate implications in improving the performance of various quantum information protocols.
噪声是实现长距离容错量子信息处理和安全通信的主要障碍。在这项工作中，我们提出了一种依赖于简单线性光学的通信协议，该协议可以最优地保护量子态免受非马尔可夫或相关噪声的影响。我们通过实验实现了该协议，并在一个极其嘈杂的信道中演示了相干和纠缠态的近乎理想保护。由于所有实际信道都表现出明显的非马尔可夫行为，因此所提出的协议将立即对改进各种量子信息协议的性能产生影响。
