Experimental superradiance and slow-light effects for quantum memories

A. Walther, A. Amari, S. Kröll, and A. Kalachev
Phys. Rev. A 80, 012317 – Published 16 July 2009

Abstract

The effects of high optical depth phenomena, such as superradiance, are investigated in potential quantum memory materials. The results may have relevance for several schemes, including controlled reversible inhomogeneous broadening, atomic frequency combs, and quantum memories based on electromagnetically induced transparency, which are based on using ensembles as storage media. It is shown that strong superradiant effects manifested as decay rates larger than 1/T2 are present even for moderate values of αL5 and increases as a function of αL. For even higher αL, effects such as off-resonant slow light is demonstrated and discussed and, finally, the efficiency of time-reversed optimized input pulses is tested. A maximum retrieval efficiency of 20% is reached and agreement with the theoretically expected result is discussed.

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  • Received 7 February 2009

DOI:https://doi.org/10.1103/PhysRevA.80.012317

©2009 American Physical Society

Authors & Affiliations

A. Walther, A. Amari, and S. Kröll

  • Department of Physics, Lund Institute of Technology, P.O. Box 118, SE-22100 Lund, Sweden

A. Kalachev

  • Zavoisky Physical-Technical Institute of the Russian Academy of Sciences, Sibirsky Trakt 10/7, Kazan 420029, Russia

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Issue

Vol. 80, Iss. 1 — July 2009

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