title: Propagation of a squeezed optical field in a medium with superluminal group velocity.
abstract: We investigated the propagation of a squeezed optical field, generated via the polarization self-rotation effect, with a sinusoidally modulated degree of squeezing through an atomic medium with anomalous dispersion. We observed the advancement of the signal propagating through a resonant Rb vapor compared to the reference signal, propagating in air. The measured advancement time grew linearly with atomic density, reaching a maximum of 11±1  μs, which corresponded to a negative group velocity of v(g)≈-7,000  m/s. We also confirmed that the increasing advancement was accompanied by a reduction of output squeezing levels due to optical losses, in good agreement with theoretical predictions.
authors.forename: Gleb
authors.initials: G
authors.lastname: Romanov
authors.forename: Travis
authors.initials: T
authors.lastname: Horrom
authors.forename: Irina
authors.initials: I
authors.lastname: Novikova
authors.forename: Eugeniy E
authors.initials: EE
authors.lastname: Mikhailov