Spin-squeezed states for metrology

TL;DR

This paper reviews advances in spin-squeezed states for quantum metrology, focusing on fundamental decoherence limits and recent developments in the field.

Contribution

It highlights the author's contributions to understanding decoherence effects and discusses new ideas and promising developments in spin-squeezing.

Findings

Decoherence imposes fundamental limits on spin-squeezing.

Recent methods can mitigate decoherence effects.

Promising new approaches are outlined for future research.

Abstract

Spin-squeezing is a well-established "quantum technology", where well-designed correlations in an ensemble of two-level systems reduce the statistical uncertainty of spectroscopic experiments. This paper reviews some important advances in the field, with emphasis on the author's contributions concerning in particular the fundamental limits imposed by decoherence. Building on the material presented in the first part, new ideas and some promising developments are outlined in the last section.