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Springer eBooks

Gain in Autler-Townes Doublet due to Interference in Decay Channels

Sunish Menon, G. S. Agarwal

Published Jan 1, 2000• 0 citations
Publisher
DOI
10.1007/978-3-662-07313-1_61

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Comment on “Interference-induced gain in the Autler-Townes doublet of a V-type atom in a cavity” and “Cavity implementation of quantum interference in a Λ-type atom”

R. Arun

In a couple of papers [Phys. Rev. A, 63, 033818 (2001); 63, 023810 (2001)], P. Zhou, S. Swain, and L. You studied the cavity-induced modifications to the Autler-Townes spectrum of three-level atoms due to the phenomenon of quantum interference. They demonstrated that probe gain can occur in either of the Autler-Townes doublet due to the cavity-induced interference among spontaneous decay channels. In this Comment, we show that this conclusion is incorrect and it contradicts the thermodynamic equilibrium conditions of the atomic system in steady state.

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Gain components in the Autler-Townes doublet from quantum interferences in decay channels

Sunish Menon, G. S. Agarwal

We consider nondegenerate pump-probe spectroscopy of $V$ systems under conditions such that interference among decay channels is important. We demonstrate how this interference can result in new gain features instead of the usual absorption features. We relate this gain to the existence of a new vacuum induced quasi-trapped-state. We further show how this also results in a large refractive index with low absorption.

arXiv:quant-ph/9908055•Physical Review A•Dec 13, 1999•132 citations
In a couple of papers [Phys. Rev. A, 63, 033818 (2001); 63, 023810 (2001)], P. Zhou, S. Swain, and L. You studied the cavity-induced modifications to the Autler-Townes spectrum of three-level atoms due to the phenomenon of quantum interference. They demonstrated that probe gain can occur in either of the Autler-Townes doublet due to the cavity-induced interference among spontaneous decay channels. In this Comment, we show that this conclusion is incorrect and it contradicts the thermodynamic equilibrium conditions of the atomic system in steady state.
We consider nondegenerate pump-probe spectroscopy of VVV systems under conditions such that interference among decay channels is important. We demonstrate how this interference can result in new gain features instead of the usual absorption features. We relate this gain to the existence of a new vacuum induced quasi-trapped-state. We further show how this also results in a large refractive index with low absorption.