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Abstract

The hybrid quantum system composed of superconductor and cold atoms is expected to achieve fast quantum gates, long-life quantum storage and long-distance transmission through optical fibers, making it one of the most promising hybrid quantum systems to realize optical interconnection between two superconducting quantum computers. In this paper, we comprehensively review the recent research advancements in the optical interconnection of two superconducting quantum computers, based on the superconductor and cold atoms hybrid quantum system, specifically the review covers the coherent coupling between superconducting chips and cold atoms, the coherent microwave-to-optics conversion, and the long-range microwave interconnection between superconducting qubits and quantum converters. The system is expected to provide a physical and technical foundation for practical optical-fiber interconnection of two superconducting quantum computers, and have broad applications in distributed superconducting quantum computation and hybrid quantum networks.

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Authors and contacts

Corresponding author:Liang Zhen-Tao,ztliangscnu@163.com

Funds:Project supported by the Innovation Program for Quantum Science and Technology, China (Grant No. 2021ZD0301705), the National Natural Science Foundation of China (Grant Nos. 12104168, 12074132, 12225405, 12247123, 12304287, U20A2074, 12074180), the National Key Research and Development Program of China (Grant Nos. 2022YFA1405300, 2022YFA1405303, 2020YFA0309500), the China Postdoctoral Science Foundation (Grant Nos. 2022M721222, 2023T160233), the Basic and Applied Basic Research Foundation of Guangdong Province, China (Grant Nos. 2021A1515110668, 2023A1515011550), and the Science and Technology Program of Guangzhou, China (Grant No. 202201010533).

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Cited By

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研究组	图宾根大学^[20]	图宾根大学^[21]	伦敦大学^[22]	华南师大
原子编码态	基态	里德伯态	里德伯态	基态
超导腔形式	共面波导腔	共面波导腔	共面波导腔	LC谐振腔
耦合方式	磁耦合	电耦合	电耦合	磁耦合
耦合强度	$ (2{\text{π}}\times 0.5) $ Hz	$ (2{\text{π}}\times 40) $ kHz	—	待测

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研究组	新加坡国立大学^[31]	华南师大^[30]	芝加哥大学^[28]	阿尔伯塔大学^[29]
原子团温度	冷原子	冷原子	冷原子	热原子
混频形式	六波混频	六波混频	四波混频	三波混频
内转换效率/%	5	82	58	—
总转换效率/%			2.5	$ 3\times {10}^{-9} $
带宽/MHz	15	1	0.36	1.00

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Vol. 72, Issue 20 - 2023-10-20

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