Tuesday, October 9, 2012

1210.1970 (Hemant Katiyar et al.)

Violation of Entropic Leggett-Garg Inequality in Nuclear Spin Ensembles    [PDF]

Hemant Katiyar, Abhishek Shukla, Rama Koteswara Rao, T. S. Mahesh
We report an experimental study of recently formulated entropic Leggett-Garg inequality (LGI) by Usha Devi et.al. (arXiv: 1208.4491v2 (2012)). This inequality places a bound on the statistical measurement outcomes of dynamical observables describing a macrorealistic system. Such bounds may be violated by quantum systems, and provide an important way to distinguish quantumness from classical behavior. Here we study entropic LGI using an ensemble of spin-1/2 nuclei initialized into a maximally mixed state. We also describe a general method to extract single-event and joint probabilities using an ancilla register. The experimental results show a violation of entropic LGI by over five standard deviations. These results agree with the predictions of quantum theory.
View original: http://arxiv.org/abs/1210.1970

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