The two-photon transition (6S(sub 1/2) yields 6D(sub 5/2)) of atomic Cesium is investigated for excitation with squeezed vacuum generated via nondegenerate parametric down conversion. The two-photon excitation rate (R) is observed to have a non-quadratic dependence of R = aI(exp 2) + bI on the incident photon flux (I), reflecting the nonclassical correlations of the squeezed vacuum field.

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Two-photon interaction of a squeezed light field with an atom

Dan Yao, Guang‐Can Guo

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arXiv:1105.2007 · Nature

Observation of squeezed light from one atom excited with two photons

Alexei Ourjoumtsev, Alexander Kubanek, M. Koch, Christian Sames, Pepijn W. H. Pinkse, Gerhard Rempe, Karim Murr

Published Jun 1, 2011• 101 citations

arXiv HTML PDF

DOI: 10.1038/nature10170

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The two-photon transition ${6S}_{1/2}\ensuremath{\rightarrow}{6D}_{5/2}$ is investigated for trapped atomic cesium excited by squeezed light. The rate

R

of two-photon excitation versus intensity

I

is observed to be consistent with the functional form $R\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}{\ensuremath{\beta}}_{1}I+{\ensuremath{\beta}}_{2}{I}^{2}$, extending into a region with slope 1.3. This departure from the quadratic form for classical light sources is due to the fundamental alteration of atomic radiative processes by the nonclassical field.