Frequency-Dependent Squeeze Amplitude Attenuation and Squeeze Angle   Rotation by Electromagnetically Induced Transparency for Gravitational Wave   Interferometers
  We study the effects of frequency-dependent squeeze amplitude attenuation and squeeze angle rotation by electromagnetically induced transparency (EIT) on gravitational wave (GW) interferometers. We propose the use of low-pass, band-pass, and high-pass EIT filters, an S-shaped EIT filter, and an intra-cavity EIT filter to generate frequency-dependent squeezing for injection into the antisymmetric port of GW interferometers. We find that the EIT filters have several advantages over the previous filter designs with regard to optical losses, compactness, and the tunability of the filter linewidth. 
Eugeniy E. Mikhailov, Keisuke Goda, Thomas Corbitt, Nergis Mavalvala