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The violation of J. Bell's inequality with two entangled and spatiallyseparated quantum two- level systems (TLS) is often considered as the mostprominent demonstration that nature does not obey ?local realism?. Underdifferent but related assumptions of "macrorealism", plausible for macroscopicsystems, Leggett and Garg derived a similar inequality for a single degree offreedom undergoing coherent oscillations and being measured at successivetimes. Such a "Bell's inequality in time", which should be violated by aquantum TLS, is tested here. In this work, the TLS is a superconducting quantumcircuit whose Rabi oscillations are continuously driven while it iscontinuously and weakly measured. The time correlations present at the detectoroutput agree with quantum-mechanical predictions and violate the inequality by5 standard deviations.

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