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

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.

10 pages, 8 figures. Include supplementary informations

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• High-Efficiency Tunable Microwave Photon Detector Based on a Semiconductor Double Quantum Dot Coupled to a Superconducting High-Impedance Cavity
• Two-quanta processes in coupled double-quantum-dot cavity systems
• Wigner-function formalism for the detection of single microwave pulses in a resonator-coupled double quantum dot
• Fast and Continuous Detection of Single Microwave Photons via Photo-assisted Quasiparticle Tunneling to a Superconducting Island
• Dispersive detection of single microwave photons with quantum dots
• Dissipation and noise in strongly driven Josephson junctions