Physics – Quantum Physics
Scientific paper
2010-08-06
Physics
Quantum Physics
Scientific paper
The burgeoning fields of quantum computing and quantum key distribution have created a demand for a quantum memory. The gradient echo memory scheme is a quantum memory candidate for light storage that can boast efficiencies approaching unity, as well as the flexibility to work with either two or three level atoms. The key to this scheme is the frequency gradient that is placed across the memory. Currently the three level implementation uses a Zeeman gradient and warm atoms. In this paper we model a new gradient creation mechanism - the ac Stark effect - to provide an improvement in the flexibility of gradient creation and field switching times. We propose this scheme in concert with a move to cold atoms (~1 mK). These temperatures would increase the storage times possible, and the small ensemble volumes would enable large ac Stark shifts with reasonable laser power. We find that memory bandwidths on the order of MHz can be produced with experimentally achievable laser powers and trapping volumes, with high precision in gradient creation and switching times on the order of nanoseconds possible. By looking at the different decoherence mechanisms present in this system we determine that coherence times on the order of 10s of milliseconds are possible, as are delay-bandwidth products of approximately 50 and efficiencies over 90%.
Buchler Ben C.
Hetet Gabriel
Hosseini Mahdi
Lam Ping Koy
Sparkes Ben M.
No associations
LandOfFree
An AC Stark Gradient Echo Memory in Cold Atoms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An AC Stark Gradient Echo Memory in Cold Atoms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An AC Stark Gradient Echo Memory in Cold Atoms will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-230596