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We demonstrated that by using a pump field with non-zero orbital angularmomentum (OAM) in the polarization self-rotation squeezing process it ispossible to generate a squeezed vacuum optical field with the matching OAM. Wefound a similar level of maximum quantum noise reduction for a first-orderLaguerre-Gaussian pump beam and a regular Gaussian pump beam, even though theoptimal operational conditions differed in these two cases. Also, weinvestigated the effect of self-defocusing on the level of the vacuum squeezingby simultaneously monitoring the minimum quantum noise level and the outputbeam transverse profile at various pump laser powers and atomic densities, andfound no direct correlations between the increased beam size and the degree ofmeasured squeezing.

Generating squeezed vacuum field with non-zero orbital angular momentum with atomic ensembles