Generation Of Squeezed Light By Optically Pumped Two-level Atom In A Cavity Containing Parametric Amplifier And Coupled To Squeezed Vacuum Reservoir

In this thesis, we have analyzed the quantum properties of light generated by coherentlyrndriven two level atom in a cavity containing a parametric amplifier and coupled to a squeezedrnvacuum reservoir. The equations of evolution for the expectation values of cavity mode andrnatomic operators are determined with the aid of the system’s master equation. Applyingrnthe large time approximation to the cavity mode quantum Langiven equation, we obtain thernsteady-state solutions for the expectation values of cavity mode and atomic operators. Utilizingrnthese solutions, we calculate the mean photon number, the power spectrum, second-orderrncorrelation function, quadrature variance and squeezing of the cavity mode.rnOur results indicate that the two-level atom has larger probability of being found in the lowerrnlevel than being found in the upper level and the photons of the fluorescent light producedrnby the two-level atom are found to be anti-bunched. Moreover, the cavity mode is observedrnto be squeezed, with squeezing being occurring in the plus quadrature.rnIn addition, the squeezing increases as the amplitude of driving coherent light increases; withrna maximum squeezing of 60% for (_ = 0.1) and 50% in the absence of parametric amplifier.rnAnd the degree of squeezing enhances with the increase of stimulated emission decay constantrnand reaches a maximum value of 70% below the vacuum state level.

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