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Higher order nonclassical properties of fields propagating through acodirectional asymmetric nonlinear optical coupler which is prepared bycombining a linear wave guide and a nonlinear (quadratic) wave guide operatedby second harmonic generation are studied. A completely quantum mechanicaldescription is used here to describe the system. Closed form analytic solutionsof Heisenberg's equations of motion for various modes are used to show theexistence of higher order antibunching, higher order squeezing, higher ordertwo-mode and multi-mode entanglement in the asymmetric nonlinear opticalcoupler. It is also shown that nonclassical properties of light can transferfrom a nonlinear wave guide to a linear wave guide.

Higher order nonclassicalities in a codirectional nonlinear optical coupler: Quantum entanglement, squeezing and antibunching