We present a superconducting circuit device that provides active, on-demand, tunable dissipation on a target mode of the electromagnetic field. Our device is based on a tunable "dissipator" that can be made lossy when tuned into resonance with a broadband filter mode. When driven parametrically, this dissipator induces loss on any mode coupled to it with energy detuning equal to the drive frequency. We demonstrate the use of this device to reset a superconducting qubit's readout cavity after a measurement, removing photons with a characteristic rate above 50μs−1. We also demonstrate that the dissipation can be driven constantly to simultaneously damp and cool the cavity, effectively eliminating thermal photon fluctuations as a relevant decoherence channel. Our results demonstrate the utility of our device as a modular tool for environmental engineering and entropy removal in circuit QED.
@article{arxiv.2310.16785,
title = {On-demand driven dissipation for cavity reset and cooling},
author = {Vivek Maurya and Haimeng Zhang and Daria Kowsari and Andre Kuo and Darian M. Hartsell and Clark Miyamoto and Jocelyn Liu and Sadman Shanto and Evangelos Vlachos and Azarin Zarassi and Kater W. Murch and Eli M. Levenson-Falk},
journal= {arXiv preprint arXiv:2310.16785},
year = {2024}
}