Investigating nonclassicality in nonlinear electronic spectroscopy. (arXiv:1808.04427v2 [quant-ph] UPDATED)

In this work, we establish a connection between nonlinear electronic
spectroscopy and the protocol for the non-disturbance condition, the
non-fullfilment of which is a witness of nonclassicality and can be related to
the presence of coherence. Our approach permits us to express the
nonclassicality witness condition in terms of common observables in the context
of electronic spectroscopy experiments, such as the induced polarization. In
this way, we provide the theoretical framework allowing one to infer
nonclassicality from the detected signals in these experiments.

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