Simultaneous Resonant and Broadband Detection for Dark Sectors

Author:

Yifan Chen, Chunlong Li, Yuxin Liu, Jing Shu, Yuting Yang, Yanjie Zeng

Keyword:

High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), General Relativity and Quantum Cosmology (gr-qc), High Energy Physics - Experiment (hep-ex), Quantum Physics (quant-ph)

journal:

date:

2023-09-20 16:00:00

Abstract

Electromagnetic resonant systems, such as cavities or LC circuits, have emerged as powerful detectors for probing ultralight boson dark matter and high-frequency gravitational waves. However, the limited resonant bandwidth of conventional single-mode resonators, imposed by quantum fluctuations, necessitates numerous scan steps to cover broad unexplored frequency regions. The incorporation of multiple auxiliary modes can realize a broadband detector while maintaining a substantial signal response. The broadened sensitive width can be on the same order as the resonant frequency, encompassing several orders of the source frequency for heterodyne detection, where a background cavity mode transitions into another. Consequently, our approach enables significantly deeper exploration of the parameter space within the same integration time compared to single-mode detection.

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