On-Demand Cavity Cooling and Reset with a Modular Dissipator

Spurious thermal photons in readout resonators are a leading source of dephasing in superconducting qubits. To remove these photons, one can introduce a lossy interaction to the environment. To preserve the coherence of a logical qubit, we introduce a lossy "dissipator" based on a transmon qubit, a flexible and modular component which can be integrated into any superconducting qubit circuit. Using a parametric drive to induce coupling between the cavity and dissipator, we remove thermal photons from the cavity and dissipate them to the environment, thereby suppressing noise seen by a logical qubit coupled to the same readout resonator. We discuss theoretical, numerical, and experimental results demonstrating that this driven dissipative cooling provides fast cavity reset and can cool the system below the bath temperature.