Abstract
Geometric phase of mixed state is expanded for a two-level atom interacting with a quantized field mode, where master equation is a modified Bloch equation with constant terms that are used to explain emergence of sidebands in the spectrum of the fluorescent light. The results show that geometric phase transition is observed for medium initial angle when the Rabi frequency associated with the driving field becomes comparable to the spectral width of the atom. We find that the geometric phase transition depends on population inversion and Bloch radius, which is helpful to understand mechanism of sideband.
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Xu, H., Ji, Y.H. & Wang, Z.S. Geometric Phase and Sidebands. Int J Theor Phys 50, 497–506 (2011). https://doi.org/10.1007/s10773-010-0558-0
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DOI: https://doi.org/10.1007/s10773-010-0558-0