We investigate the properties of a recently proposed Gradient Echo Memory (GEM) scheme for information mapping between optical and atomic systems. We show that GEM can be described by the dynamic formation of polaritons in k-space. This picture highlights the flexibility and robustness with regards to the external control of the storage process. Our results also show that, as GEM is a frequency-encoding memory, it can accurately preserve the shape of signals that have large time-bandwidth products, even at moderate optical depths. At higher optical depths, we show that GEM is a high fidelity multi-mode quantum memory.
@article{arxiv.0801.3860,
title = {Multi-Modal Properties and Dynamics of the Gradient Echo Quantum Memory},
author = {G. Hétet and J. J. Longdell and M. J. Sellars and P. K. Lam and B. C. Buchler},
journal= {arXiv preprint arXiv:0801.3860},
year = {2008}
}