Quantum memory for light via stimulated off-resonant Raman process: beyond the three-level Lambda-scheme approximation
arXiv:1007.3391 · doi:10.1103/PhysRevA.82.033838
Abstract
We consider a quantum memory scheme based on the conversion of a signal pulse into a long-lived spin coherence via stimulated off-resonant Raman process. For a storing medium consisting of alkali atoms, we have calculated the Autler-Townes resonance structure created by a strong control field. By taking into account the upper hyperfine states of the D1 optical transition, we show important deviations from the predictions of the usual three-level Lambda-scheme approximation and we demonstrate an enhancement of the process for particular detunings of the control. We estimate the memory efficiency one can obtain using this configuration.
8 pages, 6 figures
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