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arXiv · 2011.04793

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

Teng Zhang·Joe Bentley·Haixing Miao
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Abstract

Quantum noise limits the sensitivity of laser interferometric gravitational-wave detectors. Given the state-of-the-art optics, the optical losses define the lower bound of the best possible quantum-limited detector sensitivity. In this work, we come up with a broadband signal recycling scheme which gives potential solution to approaching this lower bound by converting the signal recycling cavity to be a broadband signal amplifier using an active optomechanical filter. We will show the difference and advantage of such a scheme compared with the previous white light cavity scheme using the optomechanical filter in [Phys.Rev.Lett.115.211104 (2015)]. The drawback is that the new scheme is more susceptible to the thermal noise of the mechanical oscillator.

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Teng Zhang, Joe Bentley, Haixing Miao. 2021-02-16. A Broadband Signal Recycling Scheme for Approaching the Quantum Limit from Optical Losses. https://doi.org/10.3390/galaxies9010003

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