Dynamics of Three-Level Atom Pumped by Coherent Light and With Spontaneous Emission
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Date
2018-08-02
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Addis Ababa University
Abstract
In this research we have studied the squeezing and statistical properties of the cavity
light generated by a coherently driven three-level atom with an open cavity coupled to
a two-mode vacuum reservoir via a single-port mirror. We carry out our calculation
by putting the noise operators associated with the vacuum reservoir in normal order.
Employing the master equation and the quantum Langevin equations, we obtained the
equations of evolution of the expectation values of the atomic operators. Then applying
the resulting solutions, we have calculated the mean photon number, variance of the
photon number, and the quadrature variance for the single-modes cavity light as well
as the two-mode cavity light. Moreover, we have obtained the quadrature squeezing for
the two-mode cavity light. We have noticed that the mean photon number, the variance
of the photon number for light mode a, the variance of the photon number for the twomode
cavity light, and the quadrature variance of light mode a for = 0 is greater than
for = 0.1. The quadrature variance of light mode b in the absence of spontaneous
emission ( = 0) is less than in the presence of spontaneous emission ( = 0.1). We
have also found that the maximum quadrature squeezing of the two-mode cavity light
is 43.42% for both = 0 and = 0.1 below the vacuum-state level.
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Keywords
Dynamics of Three-Level Atom, Coherent Light and With, Spontaneous Emission