Coherence of operations and interferometry

TL;DR

This paper explores how quantum coherence, a fundamental quantum feature, impacts the performance of interferometric experiments and connects coherence detection and creation to practical technological applications.

Contribution

It establishes a link between quantum coherence operations and their effectiveness in interferometry, bridging theoretical resource quantification with experimental applications.

Findings

Quantum coherence detection correlates with interferometric sensitivity.

Operations that create coherence enhance interferometric performance.

Framework connects resource theory to practical quantum technologies.

Abstract

Quantum coherence is one of the key features that fuels applications for which quantum mechanics exceeds the power of classical physics. This explains the considerable efforts that were undertaken to quantify coherence via quantum resource theories. An application of the resulting framework to concrete technological tasks is however largely missing. Here, we address this problem and connect the ability of an operation to detect or create coherence to the performance of interferometric experiments.