Microwave amplification via interfering multi-photon processes in a half-waveguide quantum electrodynamics system

• URL: http://arxiv.org/abs/2302.07442v1
• Date: Wed, 15 Feb 2023 03:24:17 GMT
• Title: Microwave amplification via interfering multi-photon processes in a half-waveguide quantum electrodynamics system
• Authors: Fahad Aziz, Kuan Ting Lin, Ping Yi Wen, Samina, Yu Chen Lin, Emely Wiegand, Ching-Ping Lee, Yu-Ting Cheng, Ching-Yeh Chen, Chin-Hsun Chien, Kai-Min Hsieh, Yu-Huan Huang, Ian Hou, Jeng-Chung Chen, Yen-Hsiang Lin, Anton Frisk Kockum, Guin Dar Lin, and Io-Chun Hoi
• Abstract summary: We investigate the amplification of a microwave probe signal by a superconducting artificial atom. Due to the weak anharmonicity of the artificial atom, a strong pump field creates excitations among the dressed states. We obtain a maximum amplitude of about 18 %, higher than in any previous experiment with a single artificial atom.
• Score: 2.884845555225785
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the amplification of a microwave probe signal by a superconducting artificial atom, a transmon, strongly coupled to the end of a one-dimensional semi-infinite transmission line. The end of the transmission line acts as a mirror for microwave fields. Due to the weak anharmonicity of the artificial atom, a strong pump field creates multi-photon excitations among the dressed states. Transitions between these dressed states, Rabi sidebands, give rise to either amplification or attenuation of the weak probe. We obtain a maximum amplitude amplification of about 18 %, higher than in any previous experiment with a single artificial atom, due to constructive interference between Rabi sidebands. We also characterize the noise properties of the system by measuring the spectrum of spontaneous emission.

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