Microwave amplification via interfering multi-photon processes in a half-waveguide quantum electrodynamics system
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.
Keywords
Cite
@article{arxiv.2302.07442,
title = {Microwave amplification via interfering multi-photon processes in a half-waveguide quantum electrodynamics system},
author = {Fahad Aziz and Kuan Ting Lin and Ping Yi Wen and Samina and Yu Chen Lin and Emely Wiegand and Ching-Ping Lee and Yu-Ting Cheng and Ching-Yeh Chen and Chin-Hsun Chien and Kai-Min Hsieh and Yu-Huan Huang and Ian Hou and Jeng-Chung Chen and Yen-Hsiang Lin and Anton Frisk Kockum and Guin Dar Lin and Io-Chun Hoi},
journal= {arXiv preprint arXiv:2302.07442},
year = {2025}
}