Putting a whole cat into a quantum mechanical superposition of two states, as in Erwin Schrödinger's original thought experiment, might not be realistically possible, but researchers have found a macroscopic system that could come close to it.

Mishkat Bhattacharya and Pierre Meystre of the University of Arizona have demonstrated that it should be possible to get pairs of membranes to interact by reflecting light into vibrational states that are analogous to the excitations of single molecules.

Michael Hartmann and Martin Plenio at Imperial College in London have also argued that such optically coupled membranes could be put into entangled states. It will take challenging experimental work using laser cooling to get these effects to occur, but the membranes could be 1 mm2, which is closer to feline scales than to the scale of atoms.