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We consider improving the sensitivity of future interferometricgravitational-wave detectors by simultaneously injecting two squeezed vacuums(light), filtered through a resonant Fabry-Perot cavity, into the dark port ofthe interferometer.The same scheme with single squeezed vacuum was firstproposed and analyzed by Corbitt et al. Here we show that the extra squeezedvacuum, together with an additional homodyne detection suggested previously byone of the authors, allows reduction of quantum noise over the entire detectionband. To motivate future implementations, we take into account a realistictechnical noise budget for Advanced LIGO (AdvLIGO) and numerically optimize theparameters of both the filter and the interferometer for detectinggravitational-wave signals from two important astrophysics sources, namelyNeutron-Star--Neutron-Star (NSNS) binaries and Bursts. Assuming the opticalloss of the 30m filter cavity to be 10ppm per bounce and 10dB squeezinginjection, the corresponding quantum noise with optimal parameters lowers by afactor of 10 at high frequencies and goes below the technical noise at low andintermediate frequencies.

Increasing the sensitivity of future gravitational-wave detectors with double squeezed-input