超越不可克隆极限的高保真量子隐形传态及连续变量的纠缠交换

High-fidelity teleportation beyond the no-cloning limit and entanglement swapping for continuous variables.

作者信息

Takei Nobuyuki, Yonezawa Hidehiro, Aoki Takao, Furusawa Akira

机构信息

Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

出版信息

Phys Rev Lett. 2005 Jun 10;94(22):220502. doi: 10.1103/PhysRevLett.94.220502. Epub 2005 Jun 8.

DOI:10.1103/PhysRevLett.94.220502

PMID:16090375

Abstract

We experimentally demonstrate continuous-variable quantum teleportation beyond the no-cloning limit. We teleport a coherent state and achieve the fidelity of 0.70 +/- 0.02 that surpasses the no-cloning limit of 2/3. Surpassing the limit is necessary to transfer the nonclassicality of an input quantum state. By using our high-fidelity teleporter, we demonstrate entanglement swapping, namely, teleportation of quantum entanglement, as an example of transfer of nonclassicality.

摘要

我们通过实验证明了超越不可克隆极限的连续变量量子隐形传态。我们隐形传态了一个相干态，并实现了0.70±0.02的保真度，超过了2/3的不可克隆极限。超越该极限对于传递输入量子态的非经典性是必要的。通过使用我们的高保真隐形传态器，我们展示了纠缠交换，即量子纠缠的隐形传态，作为非经典性传递的一个例子。