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