Efficient Microwave Photon to Electron Conversion in a High Impedance Quantum Circuit

• URL: http://arxiv.org/abs/2312.14065v2
• Date: Wed, 06 Nov 2024 10:40:21 GMT
• Title: Efficient Microwave Photon to Electron Conversion in a High Impedance Quantum Circuit
• Authors: Ognjen Stanisavljević, Jean-Côme Philippe, Julien Gabelli, Marco Aprili, Jérôme Estève, Julien Basset,
• Abstract summary: We demonstrate an efficient and continuous microwave photon to electron converter with large quantum efficiency ($83%$) and low dark current. These unique properties are enabled by the use of a high kinetic inductance disordered superconductor, granular aluminium.
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• Abstract: We demonstrate an efficient and continuous microwave photon to electron converter with large quantum efficiency ($83\%$) and low dark current. These unique properties are enabled by the use of a high kinetic inductance disordered superconductor, granular aluminium, to enhance light-matter interaction and the coupling of microwave photons to electron tunneling processes. As a consequence of strong coupling, we observe both linear and non-linear photon-assisted processes where 2, 3 and 4 photons are converted into a single electron at unprecedentedly low light intensities. Theoretical predictions, which require quantization of the photonic field within a quantum master equation framework, reproduce well the experimental data. This experimental advancement brings the foundation for high-efficiency detection of individual microwave photons using charge-based detection techniques.

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