A macro-realism inequality for opto-electro-mechanical systems

Details A macro-realism inequality for opto-electro-mechanical systems A macro-realism inequality for opto-electro-mechanical systems

2011-06-16

arxiv.org/abs/1106.3138v2

Physics

Quantum Physics

9 pages, 2 figures. Added additional figure (2b), and associated content

Scientific paper

We show how to apply the Leggett-Garg inequality to opto-electro-mechanical systems near their quantum ground state. We find that by using a dichotomic quantum non-demolition measurement (via, e.g., an additional circuit-QED measurement device) either on the cavity or on the nanomechanical system itself, the Leggett-Garg inequality is violated. We argue that only measurements on the mechanical system itself give a truly unambigous violation of the Leggett-Garg inequality for the mechanical system. In this case, a violation of the Leggett-Garg inequality indicates physics beyond that of "macroscopic realism" is occurring in the mechanical system. Finally, we discuss the difficulties in using unbound non-dichotomic observables with the Leggett-Garg inequality.

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