  We demonstrate the ability of a phase-sensitive amplifier (PSA) to
pre-amplify a selected quadrature of one mode of a two-mode squeezed state in
order to improve the measurement of two-mode quantum correlations that exist
before degradation due to optical and detection losses. We use four-wave mixing
(4WM) in $^{85}$Rb vapor to generate bright beams in a two-mode squeezed state.
One of these two modes then passes through a second 4WM interaction in a PSA
configuration to noiselessly pre-amplify the desired quadrature of the mode
before loss is intentionally introduced. We demonstrate an enhancement in the
measured degree of intensity correlation and intensity-difference squeezing
between the two modes.
