Quantum State Transfer over 1200 km Assisted by Prior Distributed Entanglement

Bo Li, Yuan Cao, Yu-Huai Li, Wen-Qi Cai, Wei-Yue Liu, Ji-Gang Ren, Sheng-Kai Liao, Hui-Nan Wu, Shuang-Lin Li, Li Li, Nai-Le Liu, Chao-Yang Lu, Juan Yin, Yu-Ao Chen, Cheng-Zhi Peng, and Jian-Wei Pan
Phys. Rev. Lett. 128, 170501 – Published 26 April 2022

Abstract

Long-distance quantum state transfer (QST), which can be achieved with the help of quantum teleportation, is a core element of important quantum protocols. A typical situation for QST based on teleportation is one in which two remote communication partners (Alice and Bob) are far from the entanglement source (Charlie). Because of the atmospheric turbulence, it is challenging to implement the Bell-state measurement after photons propagate in atmospheric channels. In previous long-distance free-space experiments, Alice and Charlie always perform local Bell-state measurement before the entanglement distribution process is completed. Here, by developing a highly stable interferometer to project the photon into a hybrid path-polarization dimension and utilizing the satellite-borne entangled photon source, we demonstrate proof-of-principle QST at the distance of over 1200 km assisted by prior quantum entanglement shared between two distant ground stations with the satellite Micius. The average fidelity of transferred six distinct quantum states is 0.82±0.01, exceeding the classical limit of 2/3 on a single copy of a qubit.

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  • Received 18 April 2021
  • Accepted 16 March 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.170501

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Bo Li1,2,3,*, Yuan Cao1,2,3,*, Yu-Huai Li1,2,3, Wen-Qi Cai1,2,3, Wei-Yue Liu1,2,3, Ji-Gang Ren1,2,3, Sheng-Kai Liao1,2,3, Hui-Nan Wu1,2,3, Shuang-Lin Li1,2,3, Li Li1,2,3, Nai-Le Liu1,2,3, Chao-Yang Lu1,2,3, Juan Yin1,2,3, Yu-Ao Chen1,2,3, Cheng-Zhi Peng1,2,3, and Jian-Wei Pan1,2,3

  • 1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
  • 2Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
  • 3Shanghai Research Center for Quantum Sciences, Shanghai 201315, China

  • *These authors contributed equally to this work.

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Issue

Vol. 128, Iss. 17 — 29 April 2022

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