  Squeezed states of light have found their way into a number of applications
in quantum-enhanced metrology due to their reduced noise properties. In order
to extend such an enhancement to metrology experiments based on atomic
ensembles, an efficient light-atom interaction is required. Thus, there is a
particular interest in generating narrow-band squeezed light that is on atomic
resonance. This will make it possible not only to enhance the sensitivity of
atomic based sensors, but also to deterministically entangle two distant atomic
ensembles. We generate bright two-mode squeezed states of light, or twin beams,
with a non-degenerate four-wave mixing (FWM) process in hot $^{85}$Rb in a
double-lambda configuration. Given the proximity of the energy levels in the D1
line of $^{85}$Rb and $^{87}$Rb, we are able to operate the FWM in $^{85}$Rb in
a regime that generates two-mode squeezed states in which both modes are
simultaneously on resonance with transitions in the D1 line of $^{87}$Rb, one
mode with the $F=2$ to $F'=2$ transition and the other one with the $F=1$ to
$F'=1$ transition. For this configuration, we obtain an intensity difference
squeezing level of $-3.5$ dB. Moreover, the intensity difference squeezing
increases to $-5.4$ dB and $-5.0$ dB when only one of the modes of the squeezed
state is resonant with the D1 $F=2$ to $F'=2$ or $F=1$ to $F'=1$ transition of
$^{87}$Rb, respectively.
