https://doi.org/10.1140/epjp/s13360-021-01870-6
Regular Article
Doppler broadening and squeezing-induced sub- and super-luminal group velocity in a driven qubit model
1
Department of Physics, Abbottabad University of Science and Technology, Havelian, Pakistan
2
Mathematics Department, Faculty of Science, King AbdulAziz University, P.O. Box 80200, Zip Code 21589, Jeddah, Kingdom of Saudi Arabia
3
Department of Mathematics, Faculty of Science, University of Bahrain, Po.Box 32038, Sakhir, Kingdom of Bahrain
Received:
25
May
2021
Accepted:
12
August
2021
Published online:
30
August
2021
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.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021
