Magnetically tuned, robust and efficient filtering system for spatially multimode quantum memory in warm atomic vapors.
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.
Institute of Experimental Physics, University of Warsaw , Warsaw , Poland .
M
M
Dąbrowski
Institute of Experimental Physics, University of Warsaw , Warsaw , Poland .
R
R
Chrapkiewicz
Institute of Experimental Physics, University of Warsaw , Warsaw , Poland .
W
W
Wasilewski
Faraday filter; atomic quantum memory; collective Raman scattering; intensified sCMOS camera; narrowband tunable notch filter; rubidium vapors
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