A long-lived quantum memory was developed based on light-compensated cold 87Rb atoms in a dipole trap. The lifetime of the quantum memory was improved by 40 folds, from 0.67 ms to 28 ms with the help of a compensation laser beam. Oscillations of the memory efficiency due to the transverse mode breathing of the singly-excited spin wave have been clearly observed and clarified with a Monte-Carlo simulation procedure. With detailed analysis of the decoherence processes of the spin wave in cold atomic ensembles, this experiment provides a benchmark for the further development of high-quality quantum memories.
@article{arxiv.1012.2361,
title = {Transverse Mode Revival of a Light-Compensated Quantum Memory},
author = {Fan Yang and Torsten Mandel and Christian Lutz and Zhen-Sheng Yuan and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1012.2361},
year = {2015}
}