A Scheme to Probe the Decoherence of a Macroscopic Object

Details A Scheme to Probe the Decoherence of a Macroscopic Object A Scheme to Probe the Decoherence of a Macroscopic Object

1997-12-08

arxiv.org/abs/quant-ph/9712017v2

Phys.Rev.A59:3204,1999

Physics

Quantum Physics

Much expanded version, macroscopic mirror masses, to appear in Phys. Rev. A (tent: May 99)

Scientific paper

10.1103/PhysRevA.59.3204

We propose a quantum optical version of Schr\"{o}dinger's famous gedanken experiment in which the state of a microscopic system (a cavity field) becomes entangled with and disentangled from the state of a massive object (a movable mirror). Despite the fact that a mixture of Schr\"{o}dinger cat states is produced during the evolution (due to the fact that the macroscopic mirror starts off in a thermal state), this setup allows us to systematically probe the rules by which a superposition of spatially separated states of a macroscopic object decoheres. The parameter regime required to test environment-induced decoherence models is found to be close to those currently realizable, while that required to detect gravitationally induced collapse is well beyond current technology.

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