N. Ph. Georgiades, E. S. Polzik and H. J. Kimble,
"Atoms as Nonlinear Mixers for Detection of Quantum Correlations at
Ultrahigh Frequencies,"
Phys. Rev. A, 55, 1605, March (1997)
Measurements of quantum correlations are reported for a frequency difference of 25 THz between the signal and idler output fields generated by a subthreshold non-degenerate optical parametric oscillator. By simultaneously exciting a two-photon transition in atomic Cs by a combination of signal, idler and "reference oscillator" fields, we record modulation of the excited state population due to quantum interference between two alternative excitation pathways. the observed phase sensitive modulation is proportional to the correlation function <Es*Ei> for the quantized signal and idler fields.
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