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The future laser interferometric gravitational-wave detectors sensitivity canbe improved using squeezed light. In particular, recently a scheme which usesthe optical field with frequency dependent squeeze factor, prepared by means ofa relatively short (~30 m) amplitude filter cavity, was proposed\cite{Corbitt2004-3}. Here we consider an improved version of this scheme,which allows to further reduce the quantum noise by exploiting the quantumentanglement between the optical fields at the filter cavity two ports.

Increasing future gravitational-wave detectors sensitivity by means of amplitude filter cavities and quantum entanglement