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SCIENCE CHINA Information Sciences, Volume 63 , Issue 8 : 180503(2020) https://doi.org/10.1007/s11432-020-2953-y

Quantum network based on non-classical light

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  • ReceivedMay 5, 2020
  • AcceptedJun 13, 2020
  • PublishedJul 9, 2020

Abstract

Quantum network enables quantum communication among quantum nodes and provides advantages that are unavailable in any classical network. Based on rapidly developing science and technology in quantum communication, the studies on quantum network have also made important progresses recent years.In this study, we briefly review the experimental progresses in building quantum network based on optical field and discuss the challenges toward a quantum Internet.


Acknowledgment

This work was supported by National Natural Science Foundation of China (Grant Nos. 11834010, 61925503, 61775127), Key Project of the National Key RD program of China (Grant No. 2016YFA0301402), Applied Basic Research Program of Shanxi Province (Grant No. 201901D211164), and Fund for Shanxi “1331 Project" Key Subjects Construction.


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  • Figure 1

    (Color online) Schematic of quantum networks. (a) Local all optical quantum network, which consists of a quantum server (QS) and several users; (b) local hybrid quantum network containing quantum memory (QM); (c) the schematic of quantum Internet consisting of a quantum repeater, which enables long distance quantum communication.

  • Figure 2

    (Color online) Schematic of connecting two local quantum networks by quantum entanglement swapping. Two local quantum networks A and B are built by distributing two multipartite entangled states in several quantum nodes, respectively. By performing joint measurement on two optical modes coming from two local quantum networks and feedforward of measurement results to other quantum nodes, two quantum networks are emerged into one quantum network with new multipartite entangled states.

  • Figure 3

    (Color online) Schematic of establishing quantum entanglement among three atomic ensembles. Quantum entanglement of three optical modes is transferred to three atomic ensembles.

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