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We propose a method for fast, deterministic resonator reset based on tunabledissipative modes. The dissipator is based on a Josephson junction withrelatively low quality factor. When the dissipator is tuned into resonance witha high quality microwave resonator, resonator photons are absorbed by thedissipator at a rate orders of magnitude faster than the resonator relaxationrate. We determine the optimal parameters for realization of the tunabledissipator, and examine application of the dissipator to removing spuriousphoton population in the qubit readout resonator in circuit quantumelectrodynamics. We show that even in the nonlinear large photon occupationregime, this enhanced resonator decay rate can be attained by appropriatemodulation of the dissipator frequency.

A tunable quantum dissipator for active resonator reset in circuit QED