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Continuous variable quantum teleportation and remote state preparation between two space-separated local networks

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Abstract

Implementing quantum communication between space-separated local networks is essential for designing global quantum networks. In this study, we propose quantum teleportation and remote state preparation schemes between users of two space-separated local networks established by continuous-variable multipartite entangled states. In the proposed schemes, the quantum nodes belonging to the two distant local networks are first entangled by entanglement swapping, and then quantum communication protocols are realized. We show that quantum teleportation between any two users belonging to space-separated local networks can be realized with the assistance of other users, and squeezed thermal states can be remotely prepared in one local network by performing a homodyne projective measurement on the state in another distant local network. Our results provide a feasible approach for quantum communication between space-separated quantum networks with multipartite entangled states.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 11834010, 62005149), Fundamental Research Program of Shanxi Province (Grant No. 20210302121002), and Fund for Shanxi “1331 Project” Key Subjects Construction.

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Author notes

  1. Ren S Y and Han D M have the same contribution to this work.

Authors and Affiliations

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, China

    Siyu Ren, Dongmei Han, Meihong Wang & Xiaolong Su

  2. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China

    Siyu Ren, Dongmei Han, Meihong Wang & Xiaolong Su

Authors
  1. Siyu Ren
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  2. Dongmei Han
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  3. Meihong Wang
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  4. Xiaolong Su
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Corresponding author

Correspondence to Xiaolong Su.

Additional information

Supporting information Appendixes A–C. The supporting information is available online at info.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Ren, S., Han, D., Wang, M. et al. Continuous variable quantum teleportation and remote state preparation between two space-separated local networks. Sci. China Inf. Sci. 67, 142502 (2024). https://doi.org/10.1007/s11432-023-3913-2

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  • DOI: https://doi.org/10.1007/s11432-023-3913-2

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