  Interfacing between matter qubits and light is a crucial provision for
numerous quantum technological applications. However, a generic qubit may not
directly interact with a relevant optical field mode, and hence, one could
necessitate to adjust frequencies to match resonance conditions between
parties. In this work, we show how a parametric coupling of the qubit with a
mechanical oscillator, in conjunction with the trilinear radiation pressure
coupling of the same object with light, can induce maximal qubit-light
entanglement at an optimal time. We also show how our method enables
conditional nonclassical state preparation of an optical field state via qubit
measurements in the weak optomechanical coupling regime, whereas nonclassical
states of the same can dynamically be achieved in the moderate-to-strong single
photon coupling limit. Our scheme benefits from not requiring any cooling of
the mechanical component, and not needing an adjusting of the detunings and
transition frequencies to have resonance between any pairs of quantum systems.
