N. Ph. Georgiades, E. S. Polzik, K. Edamatsu, H. J. Kimble,
"Nonclassical Excitation for Atoms in a Squeezed Vacuum,"
Phys. Rev. Lett. 75, 3426 (1995).
The two-photon transition 6S1/2 -> 6D1/2 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 = a*I + b*I^2, extending into a region with slope 1.3 . This departure from the quadratic form for classical light sources is due to the fundametal alteration of atomic radiative processes by the nonclassical field.
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