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Over the last several decades, entangled photon pairs generated from\c{hi}^((2)) nonlinear optical materials via spontaneous parametric downconversion processes have been intensively studied for various quantumcorrelations such as Bell inequality violation and anticorrelation. In aMach-Zehnder interferometer, the photonic de Broglie wavelength has also beenstudied for quantum sensing with an enhanced phase resolution overcoming thestandard quantum limit. Here, the fundamental principles of quantumness areinvestigated in an interferometric scheme for controllable quantum correlationnot only for bipartite entangled photon pairs in a microscopic regime, but alsofor macroscopic coherence entanglement generation.

Deterministic quantum correlation in an interferometric scheme