Localizing spin dynamics in a spin-1 Bose-Einstein condensate via magnetic pulses

TL;DR

This paper introduces magnetic pulse protocols to localize spin dynamics in a spin-1 Bose-Einstein condensate, enhancing magnetometer sensitivity by suppressing atomic spin evolution.

Contribution

The authors analytically and numerically demonstrate that specific magnetic pulse sequences can significantly suppress spin dynamics in a spin-1 BEC, a novel control method.

Findings

Spin dynamics can be suppressed using two-step or four-step magnetic pulse protocols.

The protocols are effective for arbitrary initial states.

Numerical results confirm robustness and potential for improved magnetometry.

Abstract

Spin exchange interaction between atoms in a spin-1 Bose-Einstein condensate causes atomic spin evolving periodically under the single spatial mode approximation in the mean field theory. By applying fast magnetic pulses according to a two-step or a four-step control protocol, we find analytically that the spin dynamics is significantly suppressed for an arbitrary initial state. Numerical calculations under single mode approximation are carried out to confirm the validity and robustness of these protocols. This localization method can be readily utilized to improve the sensitivity of a magnetometer based on spin-1 Bose-Einstein condensates.