  With our all-atomic squeezing and filtering setup, we demonstrate control
over the noise amplitudes and manipulation of the frequency-dependent squeezing
angle of a squeezed vacuum quantum state by passing it through an atomic medium
with electromagnetically induced transparency (EIT). We generate low sideband
frequency squeezed vacuum using the polarization self-rotation effect in a hot
Rb vapor cell, and input it into a second atomic vapor subject to EIT
conditions. We use the frequency-dependent absorption of the EIT window to
demonstrate an example of squeeze amplitude attenuation and squeeze angle
rotation of the quantum noise quadratures of the squeezed probe. These studies
have implications for quantum memory and storage as well as gravitational wave
interferometric detectors.
