Establishing and storing of deterministic quantum entanglement among three distant atomic ensembles

Zhihui Yan, Liang Wu, Xiaojun Jia (), Yanhong Liu, Ruijie Deng, Shujing Li, Hai Wang, Changde Xie and Kunchi Peng
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Zhihui Yan: Shanxi University
Liang Wu: Shanxi University
Xiaojun Jia: Shanxi University
Yanhong Liu: Shanxi University
Ruijie Deng: Shanxi University
Shujing Li: Shanxi University
Hai Wang: Shanxi University
Changde Xie: Shanxi University
Kunchi Peng: Shanxi University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract It is crucial for the physical realization of quantum information networks to first establish entanglement among multiple space-separated quantum memories and then, at a user-controlled moment, to transfer the stored entanglement to quantum channels for distribution and conveyance of information. Here we present an experimental demonstration on generation, storage, and transfer of deterministic quantum entanglement among three spatially separated atomic ensembles. The off-line prepared multipartite entanglement of optical modes is mapped into three distant atomic ensembles to establish entanglement of atomic spin waves via electromagnetically induced transparency light–matter interaction. Then the stored atomic entanglement is transferred into a tripartite quadrature entangled state of light, which is space-separated and can be dynamically allocated to three quantum channels for conveying quantum information. The existence of entanglement among three released optical modes verifies that the system has the capacity to preserve multipartite entanglement. The presented protocol can be directly extended to larger quantum networks with more nodes.

Date: 2017
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DOI: 10.1038/s41467-017-00809-9

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