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arXiv · 2312.14065

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

Ognjen Stanisavljević·Jean-Côme Philippe·Julien Gabelli·Marco Aprili·Jérôme Estève·Julien Basset
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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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Ognjen Stanisavljević, Jean-Côme Philippe, Julien Gabelli, Marco Aprili, Jérôme Estève, Julien Basset. 2023-12-21. Efficient Microwave Photon to Electron Conversion in a High Impedance Quantum Circuit. https://doi.org/10.1103/physrevlett.133.076302

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