Experimental violation of a Bell's inequality in time with weak measurement

Details Experimental violation of a Bell's inequality in time with weak measurement Experimental violation of a Bell's inequality in time with weak measurement

2010-05-19

arxiv.org/abs/1005.3435v1

Nature Physics 6, 442-447 (2010)

Physics

Quantum Physics

26 pages including 10 figures, preprint format

Scientific paper

10.1038/nphys1641

The violation of J. Bell's inequality with two entangled and spatially separated quantum two- level systems (TLS) is often considered as the most prominent demonstration that nature does not obey ?local realism?. Under di?erent but related assumptions of ?macrorealism?, plausible for macroscopic systems, Leggett and Garg derived a similar inequality for a single degree of freedom undergoing coherent oscillations and being measured at successive times. Such a ?Bell's inequality in time?, which should be violated by a quantum TLS, is tested here. In this work, the TLS is a superconducting quantum circuit whose Rabi oscillations are continuously driven while it is continuously and weakly measured. The time correlations present at the detector output agree with quantum-mechanical predictions and violate the inequality by 5 standard deviations.

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