  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.
