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We present a study of homodyne measurements of two-mode, vacuum-seeded,quadrature-squeezed light generated by four-wave mixing in warm rubidium vapor.Our results reveal that the vacuum squeezing can extend down to measurementfrequencies of less than 1 Hz, and the squeezing bandwidth, similar to theseeded intensity-difference squeezing measured in this system, reaches up toapproximately 20 MHz for typical pump parameters. By dividing the squeezingbandwidth into smaller frequency bins, we show that different sidebandfrequencies represent independent sources of two-mode squeezing. Such frequencybins may provide useful qumodes for quantum information processing experiments.We also investigate the impact of group velocity delays on the correlations inthe system.

Properties of Two-Mode Quadrature Squeezing from Four-wave Mixing in Rubidium Vapor