Efficient Microwave Photon to Electron Conversion in a High Impedance Quantum Circuit
arXiv:2312.14065 · doi:10.1103/PhysRevLett.133.076302
Abstract
We demonstrate an efficient and continuous microwave photon to electron converter with large quantum efficiency () 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.
10 pages, 8 figures. Include supplementary informations
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