On-demand driven dissipation for cavity reset and cooling

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 above $50\mu {\mathrm{s}}^{-1}$. 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.

12 pages, 6 figures

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• All-thermal reversal of heat currents using qutrits
• Gatemon Qubit Revisited for Improved Reliability and Stability
• Rapid on-demand generation of thermal states in superconducting quantum circuits
• Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters
• Non-Gaussian Dissipative Quantum Thermometry Beyond Gaussian Bounds
• Non-Gaussian Phase Transition and Cascade of Instabilities in the Dissipative Quantum Rabi Model
• Loss-induced quantum nonreciprocity and entanglement in superconducting qubits
• CDJ-Pontryagin Optimal Control for General Continuously Monitored Quantum Systems