Many-body nonlocality as a resource for quantum-enhanced metrology

TL;DR

This paper shows that many-body nonlocality can be harnessed as a resource to improve the precision of quantum measurements, linking nonlocal correlations with enhanced metrological sensitivity.

Contribution

It introduces a method to connect many-body nonlocal correlations with quantum sensor sensitivity, demonstrating their utility for quantum-enhanced metrology.

Findings

Many-body nonlocality enhances measurement precision.

Examples include spin chains and ultra-cold atom gases.

Nonlocality serves as a resource for quantum sensing.

Abstract

We demonstrate that a many-body nonlocality is a resource for ultra-precise metrology. This result is achieved by linking the sensitivity of a quantum sensor with a combination of many-body correlation functions that witness the nonlocality. We illustrate our findings with some prominent examples---a collection of spins forming an Ising chain and a gas of ultra-cold atoms in any two-mode configuration.