Generation of Squeezed Light by Optically Pumped Two-Level Atom in a Cavity Containing Parametric Amplifier and Coupled to Squeezed Vacuum Reservoir
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Date
2022-04-18
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Addis Ababa University
Abstract
In this thesis, we have analyzed the quantum properties of light generated by coherently
driven two level atom in a cavity containing a parametric amplifier and coupled to a squeezed
vacuum reservoir. The equations of evolution for the expectation values of cavity mode and
atomic operators are determined with the aid of the system’s master equation. Applying
the large time approximation to the cavity mode quantum Langiven equation, we obtain the
steady-state solutions for the expectation values of cavity mode and atomic operators. Utilizing
these solutions, we calculate the mean photon number, the power spectrum, second-order
correlation function, quadrature variance and squeezing of the cavity mode.
Our results indicate that the two-level atom has larger probability of being found in the lower
level than being found in the upper level and the photons of the fluorescent light produced
by the two-level atom are found to be anti-bunched. Moreover, the cavity mode is observed
to be squeezed, with squeezing being occurring in the plus quadrature.
In addition, the squeezing increases as the amplitude of driving coherent light increases; with
a maximum squeezing of 60% for (_ = 0.1) and 50% in the absence of parametric amplifier.
And the degree of squeezing enhances with the increase of stimulated emission decay constant
and reaches a maximum value of 70% below the vacuum state level.
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Keywords
Generation, Squeezed Light, Optically Pumped Two-Level Atom, Cavity Containing, Parametric Amplifier, Coupled to Squeezed Vacuum Reservoir