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Quantum noise limits the sensitivity of laser interferometricgravitational-wave detectors. Given the state-of-the-art optics, the opticallosses define the lower bound of the best possible quantum-limited detectorsensitivity. In this work, we come up with a broadband signal recycling schemewhich gives potential solution to approaching this lower bound by convertingthe signal recycling cavity to be a broadband signal amplifier using an activeoptomechanical filter. We will show the difference and advantage of such ascheme compared with the previous white light cavity scheme using theoptomechanical filter in [Phys.Rev.Lett.115.211104 (2015)]. The drawback isthat the new scheme is more susceptible to the thermal noise of the mechanicaloscillator.

A Broadband Signal Recycling Scheme for Approaching the Quantum Limit from Optical Losses