  Cooling a mechanical mode to its motional ground state opens up avenues for
both scientific and technological advancements in the field of quantum
meteorology and information processing. We propose a multi-parameter
optimization scheme for ground-state cooling of a mechanical mode using quantum
dots. Applying the master equation approach, we formulate the optimization
scheme over a broad range of system parameters including detunings, decay
rates, pumping rates, and coupling strengths. We implement the optimization
scheme on two major types of semiconductor quantum dot systems: colloidal and
epitaxial quantum dots. These systems span a broad range of mechanical mode
frequencies, coupling rates, and decay rates. Our optimization scheme lowers
the steady-state phonon number in all cases by several orders of magnitude. We
also calculate the net cooling rate by estimating the phonon decay rate and
show that the optimized system parameters also result in efficient cooling. The
proposed optimization scheme can be readily extended to other driven systems
coupled to a mechanical mode.
