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Quantum NETwork: from theory to practice

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Abstract

The quantum internet is envisioned as the ultimate stage of the quantum revolution, which surpasses its classical counterpart in various aspects, such as the efficiency of data transmission, the security of network services, and the capability of information processing. Given its disruptive impact on the national security and the digital economy, a global race to build scalable quantum networks has already begun. With the joint effort of national governments, industrial participants, and research institutes, the development of quantum networks has advanced rapidly in recent years, bringing the first primitive quantum networks within reach. In this work, we aim to provide an up-to-date review of the field of quantum networks from both theoretical and experimental perspectives, contributing to a better understanding of the building blocks required for the establishment of a global quantum internet. We also introduce a newly developed quantum network toolkit to facilitate the exploration and evaluation of innovative ideas. Particularly, it provides dual quantum computing engines, supporting simulations in both the quantum circuit and measurement-based models. It also includes a compilation scheme for mapping quantum network protocols onto quantum circuits, enabling their emulations on real-world quantum hardware devices. We showcase the power of this toolkit with several featured demonstrations, including a simulation of the Micius quantum satellite experiment, a testing of a four-layer quantum network architecture with resource management, and a quantum emulation of the CHSH game. We hope this work can give a better understanding of the state-of-the-art development of quantum networks and provide the necessary tools to make further contributions along the way.

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Acknowledgements

We would like to thank Yu-Ao CHEN, Shusen LIU, Jingbo WANG, Kun WANG, Xin WANG, and Zihe WANG for discussions on the development of QNET. We also thank Jie LIN for suggesting relevant references on single-photon sources and detectors.

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  1. Institute for Quantum Computing, Baidu Research, Beijing, 100193, China

    Kun Fang, Jingtian Zhao, Xiufan Li, Yifei Li & Runyao Duan

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  1. Kun Fang
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  2. Jingtian Zhao
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  3. Xiufan Li
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  4. Yifei Li
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Correspondence to Kun Fang or Runyao Duan.

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Fang, K., Zhao, J., Li, X. et al. Quantum NETwork: from theory to practice. Sci. China Inf. Sci. 66, 180509 (2023). https://doi.org/10.1007/s11432-023-3773-4

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