Generation of a spin-squeezed state with trapped ions using a dressing field

TL;DR

This paper presents a method to generate highly spin-squeezed states in trapped ions by employing a dressing field and a Mølmer–Sørensen interaction, achieving high fidelity with simple pulse sequences.

Contribution

It introduces a novel approach to produce symmetric Dicke states and maximally spin-squeezed states in trapped ions using global control and adiabatic techniques.

Findings

High-fidelity generation of maximally spin-squeezed states

Use of a dressing field to create symmetric Dicke states

Efficient state preparation with simple square pulses

Abstract

We propose a method for generating a spin-squeezed state that is a symmetric Dicke state, with trapped ions using only global access. The eigenstates of the ions under a strong dressing field become symmetric Dicke states and the M$\o$lmer--S$\o$rensen interaction selectively couples one of them to an initially populated auxiliary state. A $\mid D_{2n}^n>$ state, which is maximally spin squeezed, can be generated with high fidelity using only square pulses. Using an adiabatic technique, the ideal maximally spin-squeezed state is generated.