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The European Physical Journal Plus

Quantum squeezing in coupled waveguide networks with quadratic and qubic nonlinearity

Rafael Julius, Ahmad Nazib Alias, Muhammad Syawal Abd Halim

Published Jan 1, 2022• 3 citations
Publisher
DOI
10.1140/epjp/s13360-021-02302-1

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Higher-order nonclassical properties of fields propagating through a codirectional asymmetric nonlinear optical coupler which is prepared by combining a linear waveguide and a nonlinear (quadratic) waveguide operated by second harmonic generation are studied. A completely quantum mechanical description is used here to describe the system. Closed form analytic solutions of Heisenberg's equations of motion for various modes are used to show the existence of higher-order antibunching, higher-order squeezing, and higher-order two-mode and multimode entanglement in the asymmetric nonlinear optical coupler. It is also shown that nonclassical properties of light can transfer from a nonlinear waveguide to a linear waveguide.