Superconducting circuits present a promising platform with which to realize a quantum refrigerator. Motivated by this, we fabricate and perform spectroscopy of a gated Cooper-pair box, capacitively coupled to two superconducting coplanar waveguide resonators with different frequencies. We experimentally demonstrate the strong coupling of a charge qubit to two superconducting resonators, with the ability to perform voltage driving of the qubit at GHz frequencies. We go on to discuss how the measured device could be modified to operate as a cyclic quantum refrigerator by terminating the resonators with normal-metal resistors acting as heat baths.
@article{arxiv.2109.03023,
title = {A Cooper-Pair Box Coupled to Two Resonators: An Architecture for a Quantum Refrigerator},
author = {Andrew Guthrie and Christoforus Dimas Satrya and Yu-Cheng Chang and Paul Menczel and Franco Nori and Jukka P. Pekola},
journal= {arXiv preprint arXiv:2109.03023},
year = {2022}
}