  A quantum emitter coupled to a nano-mechanical oscillator is a hybrid system
where a macroscopic degree of freedom is coupled to a purely quantum system.
Recent progress in nanotechnology has led to the realization of such devices by
embedding single artificial atoms like quantum dots or superconducting qubits
into vibrating wires or membranes, opening up new perspectives for quantum
information technologies and for the exploration of the quantum-classical
boundary. In this letter, we show that the quantum emitter can be turned into a
strikingly efficient light-controlled source of mechanical power, by exploiting
constructive interferences of classical phonon fields in the mechanical
oscillator. We show that this mechanism can be used as a novel strategy to
carry out low-background non-destructive single-shot measurement of an
optically active quantum bit state.
