3 years ago

Experimental nested purification for a linear optical quantum repeater

Experimental nested purification for a linear optical quantum repeater
Tong Xiang, Tao Yang, Bo Zhao, Cheng-Zhi Peng, Nai-Le Liu, He Lu, Xing-Can Yao, Chang Liu, Ping Xu, Jian-Wei Pan, Zheng-Da Li, Li Li, Hai-Lin Yong, Luo-Kan Chen, Yu-Ao Chen
Quantum repeaters1,2,3,4 are essential elements for demonstrating global-scale quantum communication. Over the past few decades, tremendous efforts have been dedicated to implementing a practical quantum repeater5,6,7,8,9,10. However, nested purification1, the backbone of a quantum repeater, remains a challenge because the capacity for successive entanglement manipulation is still absent. Here, we propose and demonstrate an architecture of nested purification using spontaneous parametric downconversion sources11. A heralded entangled photon pair with higher fidelity is successfully purified from two copies of low-fidelity pairs that experience entanglement swapping and noisy channels. By delicately designing the optical circuits, double-pair emission noise is eliminated automatically and the purified state can be used for scal

-Abstract Truncated-

Publisher URL: https://www.nature.com/articles/s41566-017-0010-6

DOI: 10.1038/s41566-017-0010-6

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