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Applicant:
Central University of Tamil Nadu 
Author:
R. Arun 
Corresponding Authors:
R. Arun 
DOI #:
10.1103/PhysRevA.94.043843 
Title:
Superluminal light propagation via quantum interference in decay channels 
Journal:
Physical Review A 
Year:
2016 
Volume:
94 
Page:
043843 
Keywords:
quantum interference, spontaneous emission, pump probe spectroscopy 
Abstract:
We examine the propagation of a weak probe light through a coherently driven Y-type system. Under the condition that the excited atomic levels decay via the same vacuum modes, the effects of quantum interference in decay channels are considered. It is found that the interference in decay channels results in a lossless anomalous dispersion between two gain peaks. We demonstrate that the probe pulse propagation can, in principle, be switched from subluminal to superluminal due to the decay-induced interference. We also show that the system exhibits a high index of refraction with negligible absorption for the driving fields. A dressed-state picture of the atom-light interaction is described to explain the numerical results. 
Entered by:
R. ARUN on 2020-09-02 
 
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