We report the observation of the interferometric response in parametric four-wave mixing in rubidium atoms excited by a pair of ultrashort pulses. For pulses with orthogonal polarizations and in the presence of the two-photon transition 5S–5D reveals a one-photon quantum interference, in contrast to the optical interference observed when the pulses have parallel polarization. For opposite circular polarizations no interference is observed in the fluorescence of the two-photon transition, in contrast to the one- and two-photon interferences exhibited in the nonlinear process.
© 2010 Optical Society of America
Original Manuscript: November 2, 2009
Revised Manuscript: December 18, 2009
Manuscript Accepted: December 21, 2009
Published: January 28, 2010
J. Ferraz, L. H. Acioli, and S. S. Vianna, "One- and two-photon quantum interferences in parametric four-wave mixing," Opt. Lett. 35, 375-377 (2010)