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The burgeoning fields of quantum computing and quantum key distribution havecreated a demand for a quantum memory. The gradient echo memory scheme is aquantum memory candidate for light storage that can boast efficienciesapproaching unity, as well as the flexibility to work with either two or threelevel atoms. The key to this scheme is the frequency gradient that is placedacross the memory. Currently the three level implementation uses a Zeemangradient and warm atoms. In this paper we model a new gradient creationmechanism - the ac Stark effect - to provide an improvement in the flexibilityof gradient creation and field switching times. We propose this scheme inconcert with a move to cold atoms (~1 mK). These temperatures would increasethe storage times possible, and the small ensemble volumes would enable largeac Stark shifts with reasonable laser power. We find that memory bandwidths onthe order of MHz can be produced with experimentally achievable laser powersand trapping volumes, with high precision in gradient creation and switchingtimes on the order of nanoseconds possible. By looking at the differentdecoherence mechanisms present in this system we determine that coherence timeson the order of 10s of milliseconds are possible, as are delay-bandwidthproducts of approximately 50 and efficiencies over 90%.

An AC Stark Gradient Echo Memory in Cold Atoms