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Optomechanics is currently believed to provide a promising route towards theachievement of genuine quantum effects at the large, massive-system scale. Byusing a recently proposed figure of merit that is well suited to addresscontinuous-variable systems, in this paper we analyze the requirements neededfor the state of a mechanical mode (embodied by an end-cavity cantilever or amembrane placed within an optical cavity) to be qualified as macroscopic. Weshow that, according to the phase space-based criterion that we have chosen forour quantitative analysis, the state achieved through strong single-photonradiation-pressure coupling to a quantized field of light and conditioned bymeasurements operated on the latter might be interpreted as macroscopicallyquantum. In general, though, genuine macroscopic quantum superpositions appearto be possible only under quite demanding experimental conditions.

On the limitations of a measurement-assisted optomechanical route to quantum macroscopicity of superposition states