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We have built a compact light source for bright squeezed twin-beams at795\,nm based on four-wave-mixing in atomic $^{85}$Rb vapor. With a totaloptical power of 400\,mW derived from a free running diode laser and a taperedamplifier to pump the four-wave-mixing process, we achieve 2.1\,dB intensitydifference squeezing of the twin beams below the standard quantum limit,without accounting for losses. Squeezed twin beams generated by the type ofsource presented here could be used as reference for the precise calibration ofphotodetectors. Transferring the quantum correlations from the light to atomsin order to generate correlated atom beams is another interesting prospect. Inthis work we investigate the dispersion that is generated by the employedfour-wave-mixing process with respect to bandwidth and dependence on probedetuning. We are currently using this squeezed light source to test thetransfer of spatial information and quantum correlations through media ofanomalous dispersion.

A Compact Source for Quantum Image Processing with Four-wave Mixing in Rubidium-85