Revival of Raman Coherence of Trapped Atoms

TL;DR

This paper demonstrates the revival of Raman coherence in optically trapped b atoms and explores coherence control techniques, highlighting the impact of trap anharmonicity on revival completeness, with implications for quantum memory and interferometry.

Contribution

It provides a comprehensive experimental, analytical, and numerical study of Raman coherence revivals and control methods in trapped atoms, considering trap anharmonicity effects.

Findings

Revival of atomic coherence at trap period multiples

Coherence control methods like echo and dynamical decoupling are effective

Anharmonicity causes incomplete revivals

Abstract

We perform Raman spectroscopy of optically trapped non interacting \Rb atoms, and observe revivals of the atomic coherence at integer multiples of the trap period. The effect of coherence control methods such as echo and dynamical decoupling is investigated experimentally, analytically and numerically, along with the effect of the anharmonicity of the trapping potential. The latter is shown to be responsible for incompleteness of the revivals. Coherent Raman control of trapped atoms can be useful in the context of free-oscillation atom intefrerometry and spatial multi-mode quantum memory.