Journal
JOURNAL OF MODERN OPTICS
Volume 63, Issue 20, Pages 2048-2057Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2015.1133856
Keywords
Electromagnetically induced transparency; four-wave mixing; atomic coherence; quantum memory; Rb vapour
Categories
Funding
- AFOSR [FA9550-13-1-0098]
- NSERC (Canada)
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We propose a method to controllably suppress the effect of the four-wave mixing caused by the coupling of the strong control optical field to both optical transitions in the Lambda system under the conditions of electromagnetically induced transparency (EIT). At sufficiently high atomic density, this process leads to amplification of a weak optical signal field, that is detrimental for the fidelity of any EIT-based quantum information applications. Here we show that an additional absorption resonance centred around the Stokes field frequency, generated in such a four-wave mixing process, may efficiently suppress the unwanted probe amplification without affecting properties of the EIT interaction. We discuss the possibility of creating such tunable absorption using two-photon Raman absorption resonances in the other Rb isotope, and present some preliminary experimental results.
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