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Doppler broadening and squeezing-induced sub- and super-luminal group velocity in a driven qubit model

European Physical Journal Plus, ISSN: 2190-5444, Vol: 136, Issue: 8
2021
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Article Description

We investigate the absorption and dispersion spectra of the light pulse propagation through Doppler broadened driven qubit by exponentially weak decaying field in the presence of an off-resonant broadband squeezed vacuum (SV) reservoir. Combined effects of Doppler broadening and SV reservoir parameters induce enhanced sub- and super-luminal behavior of light through the qubit medium, as compared with the normal vacuum (NV) and thermal field (TF) reservoir cases. The SV phase, as a control parameter, induce enhanced sinusoidal (positive and negative) peaks of group index of the Doppler broadened medium.

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