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Quantum mechanics predicts superposition of position states even formacroscopic objects. Recently, the use of a quasi-freely suspended mirrorcombined with laser was proposed to prepare such states, by M\"uller-Ebhardt etal. [Phys.Rev.Lett.100, 013601 (2008)]. One of the key milestones towards thisgoal is the preparation of the mechanical oscillator mainly driven by quantumback-action, which identifies the connection between the object and quantumnessof the light. Here, we describe development of a suspended 5-mg mirror drivenby quantum back-action larger than thermal fluctuating force by a factor of1.4$\pm$0.2 at 325 Hz,which is confirmed by using a triangular optical cavity.

5-mg suspended mirror driven by measurement-induced back-action