Role of seeding in the generation of polarization squeezed light by an atomic Kerr medium

Quantum state production and characterization are fundamental elements for many quantum technological applications. In this paper, we studied the generation of polarization quantum states by interacting light with a Kerr medium and the dependency of the outcome on orthogonal polarization seeding. Starting from coherent states produced by Ti:sapphire laser, interaction with a ${}_{87}\mathrm{Rb}$ warm vapor cell led to noise compression of $-5.2\pm 0.5\mathrm{dB}(6.4\pm 0.6\mathrm{dB}$ after correction of the detection quantum efficiency). Experimental characterization of the effect of an orthogonal polarization light seed on squeezing is shown to agree with the theoretical model.