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Controlling Quantum Storage in Atomic Ensembles by Fictitious Magnetic Fields

Jianmin Wang, Liang Dong, Xingchang Wang, Zihan Zhou, Jinshuai Huang, Ying Zuo, Georgios A. Siviloglou, J. F. Chen

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We have demonstrated experimentally that optically induced fictitious magnetic fields from AC Stark shifts can be utilized to extend the lifetime of quantum memories in cold atomic ensembles by rectifying spatial inhomogeneities.
DOI
10.1364/cleo_fs.2025.ff111_6

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Effective and unrestricted engineering of atom-photon interactions requires precise spatially resolved control of light beams. The significant potential of such manipulations lies in a set of disciplines ranging from solid-state to atomic physics. Here we use a Zeeman-like ac-Stark shift caused by a shaped laser beam to perform rotations of spins with spatial resolution in a large ensemble of cold rubidium atoms. We show that inhomogeneities of light intensity are the main source of dephasing and, thus, decoherence; yet, with proper beam shaping, this deleterious effect is strongly mitigated allowing rotations of 15 rad within one spin-precession lifetime. Finally, as a particular example of a complex manipulation enabled by our scheme, we demonstrate a range of collapse-and-revival behaviors of a free-induction decay signal by imprinting comb-like patterns on the atomic ensemble.