Nonlinear quantum interferometry with Bose condensed atoms

TL;DR

This paper reviews recent theoretical advances in quantum interferometry using Bose condensed atoms, emphasizing nonlinear phenomena from atom interactions and their potential for high-precision measurements beyond classical limits.

Contribution

It provides a comprehensive overview of how nonlinear atom-atom interactions in Bose condensates can be controlled and exploited for enhanced quantum interferometry.

Findings

Matter-wave solitons emerge due to atom interactions.

Macroscopic quantum self-trapping occurs in Bose-Josephson junctions.

Atom interactions can generate entanglement for precision measurements.

Abstract

In quantum interferometry, it is vital to control and utilize nonlinear interactions for achieving high-precision measurements. Attribute to their long coherent time and high controllability, ultracold atoms including Bose condensed atoms have been widely used for implementing quantum interferometry. Here, we review the recent progresses in theoretical studies of quantum interferometry with Bose condensed atoms. In particular, we focus on the nonlinear phenomena induced by the atom-atom interaction and how to control and utilize these nonlinear phenomena. Under the mean-field description, due to the atom-atom interaction, matter-wave solitons appear in the interference patterns, and macroscopic quantum self-trapping exists in the Bose-Josephson junctions. Under the many-body description, the atom-atom interaction can generate non-classical entanglement, which may be utilized to achieve high-precision measurements beyond the standard quantum limit.