Macroscopic quantum correlation in a delayed-choice quantum eraser scheme

TL;DR

This paper demonstrates a macroscopic quantum correlation in a continuous wave quantum eraser setup using polarized optical fields, showing violation of cause-effect relations and inseparable joint-parameter relations.

Contribution

It introduces a macroscopic quantum eraser scheme with polarized optical fields, extending quantum nonlocal correlations to a larger scale.

Findings

Violation of cause-effect relation in macroscopic optical fields

Inseparable joint-parameter relation observed in intensity measurements

Macroscopic quantum correlations demonstrated in a Mach-Zehnder interferometer

Abstract

Quantum entanglement is known as a unique feature of quantum mechanics, which cannot be obtained from classical physics. Recently, a coherence interpretation has been conducted for the delayed-choice quantum eraser using coherent photon pairs, where phase-locked symmetric frequency detuning between paired photons plays an essential role for selective measurement-caused nonlocal correlation. Here, a macroscopic version of the nonlocal correlation is presented using orthogonally polarized optical fields in a continuous wave quantum eraser scheme in a Mach-Zehnder interferometer (MZI). The resulting polarization projection of each MZI output fields onto a rotated polarizer satisfies the violation of the cause-effect relation. Based on this macroscopic quantum eraser, the intensity product between two projected output fields satisfies the inseparable joint-parameter relation if the intensity product is selectively measured through a low pass filter to block beating signals between them.