On-Demand Driven Dissipation for Cavity Reset and Cooling
Vivek Maurya, Haimeng Zhang, Daria Kowsari, Andre Kuo, Darian M. Hartsell, Clark Miyamoto, J. -C. Liu, Sadman Shanto, Evangelos Vlachos, Azarin Zarassi, Kater Murch, Eli Levenson-Falk
Abstract
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 greater than <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mn>50</a:mn><a:mspace width="0.2em"/><a:mtext>μ</a:mtext><a:msup><a:mtext>s</a:mtext><a:mrow><a:mo>−</a:mo><a:mn>1</a:mn></a:mrow></a:msup></a:math>. 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 quantum electrodynamics. Published by the American Physical Society 2024