Photon storage in Lambda-type optically dense atomic media. III. Effects of inhomogeneous broadening

Details Photon storage in Lambda-type optically dense atomic media. III. Effects of inhomogeneous broadening Photon storage in Lambda-type optically dense atomic media. III. Effects of inhomogeneous broadening

2006-12-11

arxiv.org/abs/quant-ph/0612084v2

Phys. Rev. A 76, 033806 (2007)

Physics

Quantum Physics

15 pages, 8 figures. V2: minor changes in presentation, new references, higher resolution of figures

Scientific paper

10.1103/PhysRevA.76.033806

In a recent paper [Gorshkov et al., Phys. Rev. Lett. 98, 123601 (2007)] and in the two preceding papers [Gorshkov et al., Phys. Rev. A 76, 033804 (2007); 76, 033805 (2007)], we used a universal physical picture to optimize and demonstrate equivalence between a wide range of techniques for storage and retrieval of photon wave packets in homogeneously broadened Lambda-type atomic media, including the adiabatic reduction of the photon group velocity, pulse-propagation control via off-resonant Raman techniques, and photon-echo-based techniques. In the present paper, we generalize this treatment to include inhomogeneous broadening. In particular, we consider the case of Doppler-broadened atoms and assume that there is a negligible difference between the Doppler shifts of the two optical transitions. In this situation, we show that, at high enough optical depth, all atoms contribute coherently to the storage process as if the medium were homogeneously broadened. We also discuss the effects of inhomogeneous broadening in solid state samples. In this context, we discuss the advantages and limitations of reversing the inhomogeneous broadening during the storage time, as well as suggest a way for achieving high efficiencies with a nonreversible inhomogeneous profile.

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