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Quantum Control of Two-photon Inter-excited States Transitions

Jongseok Lim, Han-gyeol Lee, Sangkyung Lee, Jaewook Ahn

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We demonstrate quantum control of two-photon inter-excited states transitions in a V-type atomic system. By varying linear and quadratic chirps, we project the transitions to coherent transient phenomena in a two-level system.
DOI
10.1364/cleo_at.2011.jthb14

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If a coherent perturbation field is used to couple the excited level of the coupling transition in the five-level K-type atom with another higher excited level, the two-photon electromagnetically induced transparency can be locally modulated by altering the parameters of the additional perturbation field. With different detunings of the coherent perturbation field, the absorption peak or transparency window with sharp and high-contrast spectral feature can be generated in the two-photon absorption spectrum. The physical interpretation of these phenomena is given in terms of the dressed states.
Multiphoton transitions can be reached by many routes through a continuum of virtual levels. We show that the transition probability of two-photon and multiphoton processes can be controlled by tailoring the shape of an ultrashort excitation pulse, so that the many paths leading to the final state interfere to give a desired probability amplitude. We analyze the effect of pulse shapes on N-photon absorption as well as on Raman transitions. We show theoretically that certain tailored dark pulses do not excite the system at all, while other shaped pulses induce transitions as effectively as transform limited pulses, even when their peak amplitudes are greatly reduced. These results are confirmed experimentally for two-photon transitions in atomic cesium.