Deterministic quantum correlation in an interferometric scheme

TL;DR

This paper investigates the fundamental principles of quantum correlation in an interferometric scheme, demonstrating controllable quantum correlations for both microscopic entangled photon pairs and macroscopic coherence, advancing quantum sensing and entanglement understanding.

Contribution

It introduces a novel interferometric approach to generate and control quantum correlations beyond bipartite entanglement, including macroscopic coherence.

Findings

Demonstrates controllable quantum correlation in an interferometric setup.

Shows potential for enhanced quantum sensing beyond standard limits.

Extends quantum correlation studies from microscopic to macroscopic regimes.

Abstract

Over the last several decades, entangled photon pairs generated from \c{hi}^((2)) nonlinear optical materials via spontaneous parametric down conversion processes have been intensively studied for various quantum correlations such as Bell inequality violation and anticorrelation. In a Mach-Zehnder interferometer, the photonic de Broglie wavelength has also been studied for quantum sensing with an enhanced phase resolution overcoming the standard quantum limit. Here, the fundamental principles of quantumness are investigated in an interferometric scheme for controllable quantum correlation not only for bipartite entangled photon pairs in a microscopic regime, but also for macroscopic coherence entanglement generation.