Enhancing the broadband sensitivity of gravitational wave detectors by engineering the entanglement pairs

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Improving the broadband quantum sensitivity of an advanced gravitational wave detector is one of the key steps for future updating of gravitational wave detectors. Reduction of the broadband quantum noise needs squeezed light with frequency dependent squeezing angle. Current designs for generating frequency dependent squeezed light are based on an ultra-high finesse filter cavity, therefore optical loss will serious contaminate the squeezed light. To circumvent this problem, we propose an new method for generating a frequency dependent squeezing of quantum noise field quadrature by engineering the quantum entangled field pairs which are filtered through the interferometer arm cavity. This new method may have the potential to beat the quantum noise by 7dB in recent future.