High-fidelity polarization storage in a gigahertz bandwidth quantum memory

D. G. England, P. S. Michelberger, T. F M Champion, K. F. Reim, K. C. Lee, M. R. Sprague, X. M. Jin, N. K. Langford, W. S. Kolthammer, J. Nunn, I. A. Walmsley

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34 Citations (SciVal)


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 ± 1% 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 ± 4% for 1.5 μs storage time, which is 5000 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.

Original languageEnglish
Article number124008
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number12
Publication statusPublished - 28 Jun 2012

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics


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