Coherence squeezing in optical interference

TL;DR

This paper introduces the concept of optical coherence squeezing in double-slit interference, establishing a framework for coherence uncertainty relations and demonstrating its potential for quantum-enhanced interferometry.

Contribution

It presents the first theoretical framework for coherence squeezing, including Hermitian operators and uncertainty relations, expanding the understanding of quantum degrees of freedom.

Findings

Coherence squeezing affects intensity fringe uncertainty

States exhibiting coherence squeezing are analyzed

Potential applications in quantum-enhanced interferometry

Abstract

We introduce the concept of optical coherence squeezing in double-slit interference. We construct Hermitian operators that characterize the coherence at the slits, leading to coherence uncertainty relations and a corresponding squeezing condition. We also analyze states exhibiting such squeezing and show its manifestations in the uncertainty of the magnitudes and positions of the intensity fringes. Our work identifies coherence as a fundamental degree of freedom for squeezing, complementing phase, amplitude, and polarization, which could benefit quantum-enhanced interferometry.