Affiliation:
1. Indian Institute of Technology, Kanpur
Abstract
Electromagnetically induced transparency (EIT) and Autler–Townes splitting (ATS) are
generally characterized and distinguished by the width of the
transparency created in the absorption profile of a weak probe in
presence of a strong control field. This often leads to ambiguities,
as both phenomena yield similar spectroscopic signatures. However, an
objective method based on Akaike’s information criterion (AIC) test
offers a quantitative way to discern the two regimes when applied on
the probe absorption profile. The obtained transition value of control
field strength was found to be higher than the value given by pole
analysis of the corresponding off-diagonal density matrix element. By
contrast, we apply the test on ground state coherence and the measured
coherence quantifier, which yields a distinct transition point around
the predicted value even in presence of noise. Our test accurately
captures the transition between two regimes, indicating that a proper
measure of coherence is essential for making such distinctions.
Funder
Science and Engineering Research Board
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics