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Optics Communications

Direct observation of single- and double-quantum sublevel coherence in rubidium vapor by optical raman beat detection

Stephan Appelt, Peter Scheufler, M. Mehring

Published Dec 1, 1989• 5 citations
Publisher
DOI
10.1016/0030-4018(89)90501-4

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The optically induced and detected entangled state involving an exciton Zeeman doublet with entanglement entropy as high as $\ensuremath{\sim}0.7$ was created using picosecond lasers in single GaAs\mathrm{GaAs}GaAs quantum dots. The temporal evolution of the nonradiative Raman coherence between two exciton states was directly resolved in quantum beats measured in the homodyne detected differential transmission experiment. The Raman coherence time, $66\ifmmode\pm\else\textpm\fi{}15\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$, was determined from the decay of the envelope of the quantum beats, and was found to be limited by the lifetimes of the exciton transitions, $50\ifmmode\pm\else\textpm\fi{}3\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$.
We have observed coherent Raman beat signals from a Lambda-type three-level system in a sodium atomic vapor. The sample is first prepared in a coherent superposition state of the ground-state hyperfine levels, or a dark state, by resonant bichromatic radiation. A following sudden frequency shift of one of the excitation beams causes the beat signals. Detailed analytical calculations based on the three-level Liouville equations are presented and are compared with experimental results. This simple technique is particularly suited for the obtaining of information on the generated sublevel coherence, including magnitude, phase, and decay time.