We demonstrate a microwave power-to-electrical energy conversion in a resonator-coupled double quantum dot. The system, operated as a photodiode, converts individual microwave photons to electrons tunneling through the double dot, resulting in an electrical current flowing against the applied voltage bias at input powers down to 1 femto-watt. The device attains a maximum power harvesting efficiency of 2%, with the photon-to-electron conversion efficiency reaching 12% in the single photon absorption regime. We find that the power conversion depends on thermal effects showing that thermodynamics plays a crucial role in the single photon energy conversion.
@article{arxiv.2306.15797,
title = {Microwave power harvesting using resonator-coupled double quantum dot photodiode},
author = {Subhomoy Haldar and Drilon Zenelaj and Patrick P. Potts and Harald Havir and Sebastian Lehmann and Kimberly A. Dick and Peter Samuelsson and Ville F. Maisi},
journal= {arXiv preprint arXiv:2306.15797},
year = {2024}
}