  We propose a method for fast, deterministic resonator reset based on tunable
dissipative modes. The dissipator is based on a Josephson junction with
relatively low quality factor. When the dissipator is tuned into resonance with
a high quality microwave resonator, resonator photons are absorbed by the
dissipator at a rate orders of magnitude faster than the resonator relaxation
rate. We determine the optimal parameters for realization of the tunable
dissipator, and examine application of the dissipator to removing spurious
photon population in the qubit readout resonator in circuit quantum
electrodynamics. We show that even in the nonlinear large photon occupation
regime, this enhanced resonator decay rate can be attained by appropriate
modulation of the dissipator frequency.
