England, D., Michelberger, P., Champion, T., Reim, K. F., Lee, K. C., Sprague, M. R., Jin, X.-M., Langford, N. K., Kolthammer, W. S., Nunn, J. and Walmsley, I. A. (2012) High-Fidelity Polarization Storage in a Gigahertz Bandwidth Quantum Memory. Journal of Physics B: Atomic, Molecular and Optical Physics, 45
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We demonstrate a dual-rail optical Raman memory inside a polarization interferometer; this enables us to store polarization-encoded information at GHz bandwidths in a room-temperature atomic ensemble. By performing full process tomography on the system we measure up to 97\pm1% process fidelity for the storage and retrieval process. At longer storage times, the process fidelity remains high, despite a loss of efficiency. The fidelity is 86\pm4% for 1.5 \mu s storage time, which is 5,000 times the pulse duration. Hence high fidelity is combined with a large time-bandwidth product. This high performance, with an experimentally simple setup, demonstrates the suitability of the Raman memory for integration into large-scale quantum networks.
This is a Submitted version This version's date is: 8/6/2012 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/bbbe2265-e6cd-c9cf-c498-2b35dc853b90/3/
Deposited by Research Information System (atira) on 11-Jun-2012 in Royal Holloway Research Online.Last modified on 11-Jun-2012
10 pages, 4 figures. Accepted for publication in Journal of Physics B