Publication: Squeezing in a Lambda-type three-level atom via spontaneously generated coherence
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2005-09-13
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American Physical Society
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Abstract
The squeezing spectrum of the fluorescent light is investigated for a laser-driven three-level atom of the Lambda configuration when quantum interference of the decay channels is accounted for. We show that when the two atomic transitions contribute to the detected fluorescence field, squeezing at certain frequency intervals is obtained in both the weak- and the high-Rabi-frequency regimes even for equally decay rates of the transitions. Unlike in two-level atoms in free space, squeezing can be obtained in both the in-phase and out-of-phase quadrature spectra although in different spectral regions. We also show that the squeezing spectrum can be controlled by an adequate selection of the Rabi frequencies and atomic detunings. Another remarkable effect is that squeezing can be achieved with proper relative phases of the driving fields. We provide an analytical description in the dressed basis which accounts for the main features of the squeezing spectra obtained from the numerical work.
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© 2005 The American Physical Society.
We are gratefully to Tomás Lorca L. Aranguren for a careful reading of the manuscript. This work was supported by the Projects No. PR3/04-12458 (UCM, Spain) and No. FIS2004-03267 (MEC, Spain).
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