Related papers: High-efficiency microwave photodetection by cavity coupled double dots with single cavity-photon sensitivity

High-efficiency microwave photodetection by cavity coupled double dots with single cavity-photon sensitivity

URL: http://arxiv.org/abs/2406.03047v1
Date: Wed, 5 Jun 2024 08:23:19 GMT
Title: High-efficiency microwave photodetection by cavity coupled double dots with single cavity-photon sensitivity
Authors: Subhomoy Haldar, Harald Havir, Waqar Khan, Drilon Zenelaj, Patrick P. Potts, Sebastian Lehmann, Kimberly A. Dick, Peter Samuelsson, Ville F. Maisi,
Abstract summary: A superconducting cavity-coupled double quantum dot (DQD) photodiode achieves a maximum photon-to-electron conversion efficiency of 25% in the microwave domain. With a higher-quality-factor cavity, our device measures microwave signals down to 100 aW power level and achieves sensitivity to probe microwave signals with one photon at a time in the cavity.
Score: 0.0
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: We present a superconducting cavity-coupled double quantum dot (DQD) photodiode that achieves a maximum photon-to-electron conversion efficiency of 25% in the microwave domain. With a higher-quality-factor cavity and improved device design to prevent photon leakages through unwanted pathways, our device measures microwave signals down to 100 aW power level and achieves sensitivity to probe microwave signals with one photon at a time in the cavity. We analyze the photodiode operation using Jaynes-Cummings input-output theory, identifying the key improvements of stronger cavity-DQD coupling needed to achieve near-unity photodetection efficiency. The results presented in this work represent a crucial advancement toward near unity microwave photodetection efficiency with single cavity-photon sensitivity for studies of photon statistics in the microwave range and applications related to quantum information processing.

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