For a coherently driven cavity mode coupled to a cascade three-level atom, the paper's steady-state variances imply both quadratures are squeezed, but only relative to a model-defined reference and using a modified uncertainty bound.
A degenerate three-level laser coupled to a squeezed vacuum reservoir
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abstract
Employing the master equation for a three-level laser driven by coherent light and coupled to a squeezed vacuum reservoir, we obtain stochastic differential equations associated with the normal ordering. Using the solutions of the stochastic differential equations, we calculate the quadrature variance, the squeezing spectrum, the mean photon number, and the variance of the photon number. It turns out that the degree of squeezing increases with the linear gain coefficient or the squeeze parameter. It is also found that the driving coherent light decreases the mean photon number.
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Squeezing in Both the Plus and Minus Quadratures with the Uncertainty Relation Perfectly Holding
For a coherently driven cavity mode coupled to a cascade three-level atom, the paper's steady-state variances imply both quadratures are squeezed, but only relative to a model-defined reference and using a modified uncertainty bound.