Bell's inequality for Macroscopic Squeezed Vacuum

TL;DR

This paper derives a Bell-type inequality for macroscopic photon states and demonstrates its potential violation using recent experimental macroscopic Bell states, advancing understanding of quantum nonlocality at large scales.

Contribution

It introduces a new Bell inequality applicable to macroscopic photon states and shows it can be violated with recent experimental states, bridging quantum foundations and macroscopic quantum optics.

Findings

Derived a Bell inequality for macroscopic photon numbers.

Showed the inequality can be violated with recent experimental states.

Supports the possibility of observing quantum nonlocality at macroscopic scales.

Abstract

A non-dichotomic Bell-type inequality for macroscopic photon numbers in two spatially separated beams is derived from local realistic assumptions. This inequality is shown to be possible to violate with the macroscopic Bell states recently obtained in experiment.