  The ongoing global effort to detect gravitational waves continues to push the
limits of precision measurement while aiming to provide a new tool for
understanding both astrophysics and fundamental physics. Squeezed states of
light offer a proven means of increasing the sensitivity of gravitational wave
detectors, potentially increasing the rate at which astrophysical sources are
detected by more than an order of magnitude. Since radiation pressure noise
plays an important role in advanced detectors, frequency dependent squeezing
will be required. In this paper we propose a practical approach to producing
frequency dependent squeezing for Advanced LIGO and similar interferometric
gravitational wave detectors.
