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What will be the experimental procedure to put the center of mass degree of freedom of a macroscopic object in a quantum superposition of widely separated states? I have been reading some papers on decoherence theory where the origin of classical laws is claimed to be due to the formation of entanglement between the given macroscopic quantum system and the environmental degrees of freedom. In addition one assumes that the environmental states are orthogonal. I am however unconvinced. This seems to mean that in the absence of external feilds and stray particles, ANY macroscopic body of whatever mass will be quantum. If this conclusion is correct, then is it true that environmental isolation is the sole experimental procedure to put the macroscopic system in a quantum superposition? Furthermore, how do we control which particular quantum state we prepare our macroscopic system in?

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