An ultra-high gain single-photon transistor in the microwave regime

Zhiling Wang, Zenghui Bao, Yan Li, Yukai Wu, Weizhou Cai, Weiting Wang, Xiyue Han, Jiahui Wang, Yipu Song, Luyan Sun, Hongyi Zhang () and Luming Duan ()
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Zhiling Wang: Tsinghua University
Zenghui Bao: Tsinghua University
Yan Li: Tsinghua University
Yukai Wu: Tsinghua University
Weizhou Cai: Tsinghua University
Weiting Wang: Tsinghua University
Xiyue Han: Tsinghua University
Jiahui Wang: Tsinghua University
Yipu Song: Tsinghua University
Luyan Sun: Tsinghua University
Hongyi Zhang: Tsinghua University
Luming Duan: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract A photonic transistor that can switch or amplify an optical signal with a single gate photon requires strong non-linear interaction at the single-photon level. Circuit quantum electrodynamics provides great flexibility to generate such an interaction, and thus could serve as an effective platform to realize a high-performance single-photon transistor. Here we demonstrate such a photonic transistor in the microwave regime. Our device consists of two microwave cavities dispersively coupled to a superconducting qubit. A single gate photon imprints a phase shift on the qubit state through one cavity, and further shifts the resonance frequency of the other cavity. In this way, we realize a gain of the transistor up to 53.4 dB, with an extinction ratio better than 20 dB. Our device outperforms previous devices in the optical regime by several orders in terms of optical gain, which indicates a great potential for application in the field of microwave quantum photonics and quantum information processing.

Date: 2022
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DOI: 10.1038/s41467-022-33921-6

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