Entanglement generation in continuously coupled parametric generators

Abstract

We investigate a compact source of entanglement. This device is composed of a pair of linearly coupled nonlinear waveguides operating by means of degenerate parametric downconversion. For the vacuum state at the input the generalized squeeze variance and logarithmic negativity are used to quantify the amount of nonclassicality and entanglement of output beams. Squeezing and entanglement generation for various dynamical regimes of the device are discussed.

6 pages, 7 figures

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• Dynamics of quantum light in integrated nonlinear waveguide arrays and generation of robust continuous variable entanglement
• Continuous-variable entanglement of two bright coherent states that never interacted
• Minimum resources for versatile continuous variable entanglement in integrated nonlinear waveguides
• Coupling quasi-phase matching: entanglement buildup in ${\chi }^{(2)}$ nonlinear waveguide arrays
• Supermode-based second harmonic generation in a nonlinear interferometer
• Symmetry-based analytical solutions to the χ^{(2)} nonlinear directional coupler