External-level assisted cooling by measurement

A quantum resonator in a thermal-equilibrium state with high temperature has large average population and is featured significant occupation over Fock states excitation number. The could be cooled down via continuous measurements on the ground of coupled two-level system (qubit). We find, however, that measurement-induced cooling might become inefficient high-temperature regime. Beyond conventional strategy, we introduce strong driving between excited qubit an external level. It can remarkably broaden range regard to nonvanishing populated resonator. Without any precooling procedure, our strategy allows reduction populations number, giving rise nondeterministic ground-state after sequence measurements. driving-induced fast transition constrains ancillary at their upon measurement then simulates Zeno effect. Our protocol applied cool magnetic Additionally, it generalized hybrid by interpolating methods without driving, which accelerate process increase overlap final its state.