期刊
JOURNAL OF MODERN OPTICS
卷 63, 期 20, 页码 2029-2038出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2015.1106016
关键词
atomic quantum memory; collective Raman scattering; rubidium vapors; intensified sCMOS camera; narrowband tunable notch filter; Faraday filter
类别
资金
- National Science Centre [DEC-2011/03/D/ST2/01941, DEC-2013/09/N/ST2/02229]
- PhoQuS@UW - Polish Ministry of Science and Higher Education [316244]
- Foundation for Polish Science (FNP)
Warm atomic vapor quantum memories are simple and robust, yet suffer from a number of parasitic processes which produce excess noise. For operating in a single-photon regime precise filtering of the output light is essential. Here, we report a combination of magnetically tuned absorption and Faraday filters, both light-direction insensitive, which stop the driving lasers and attenuate spurious fluorescence and four-wave mixing while transmitting narrowband Stokes and anti-Stokes photons generated in write-in and readout processes. We characterize both filters with respect to adjustable working parameters. We demonstrate a significant increase in the signal-to-noise ratio upon applying the filters seen qualitatively in measurements of correlation between the Raman scattered photons.
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