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Decaying Weak Field Excitation of a Qubit in a Squeezed Vacuum Reservoir
O. M. Frege, Mohamed M. Hassan, and Shoukry S. Hassan

A perturbation approach is adopted to solve the model Bloch equations for a 2-level atom in an off-resonant squeezed vacuum (SV) with an exponentially decaying driving field up to the second order in the Rabi frequency of the driving field. Both the instantaneous mean atomic variables (population, polarization) and the Boltzmann-Gibbs (BG) atomic entropy are calculated. Effect of the SV parameters and the damping rate of the driving field are examined computationally. Entropy investigation shows that the system is unstable for certain values of the SV phase parameter.

Keywords: Resonance fluorescence, squeezed vacuum, entropy.

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