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Squeezed states of light have found their way into a number of applicationsin quantum-enhanced metrology due to their reduced noise properties. In orderto extend such an enhancement to metrology experiments based on atomicensembles, an efficient light-atom interaction is required. Thus, there is aparticular interest in generating narrow-band squeezed light that is on atomicresonance. This will make it possible not only to enhance the sensitivity ofatomic based sensors, but also to deterministically entangle two distant atomicensembles. 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 adouble-lambda configuration. Given the proximity of the energy levels in the D1line of $^{85}$Rb and $^{87}$Rb, we are able to operate the FWM in $^{85}$Rb ina regime that generates two-mode squeezed states in which both modes aresimultaneously on resonance with transitions in the D1 line of $^{87}$Rb, onemode 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 differencesqueezing level of $-3.5$ dB. Moreover, the intensity difference squeezingincreases to $-5.4$ dB and $-5.0$ dB when only one of the modes of the squeezedstate is resonant with the D1 $F=2$ to $F'=2$ or $F=1$ to $F'=1$ transition of$^{87}$Rb, respectively.

Generation of $^{87}$Rb-resonant bright two-mode squeezed light with four-wave mixing