  Quantum Hypothesis Testing has shown the advantages that quantum resources
can offer in the discrimination of competing hypothesis. Here, we apply this
framework to optomechanical systems and fundamental physics questions. In
particular, we focus on an optomechanical system composed of two cavities
employed to perform quantum channel discrimination. We show that input squeezed
optical noise, and feasible measurement schemes on the output cavity modes,
allow to obtain an advantage with respect to any comparable classical schemes.
We apply these results to the discrimination of models of spontaneous collapse
of the wavefunction, highlighting the possibilities offered by this scheme for
fundamental physics searches.
