MG13 - Talk detail

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Abstract

A fundamental noise source limiting the measurement sensitivity of interferometric gravitational wave (GW) observatories is quantum noise. While the sensitivity of the first observatory generation was limited by the light's shot noise at frequencies above several hundred hertz, the next-generation observatories are expected to be limited by quantum noise also in their low-frequency detection band. Squeezed states of the light field allow for improving the sensitivity at all quantum-noise-limited frequencies. A squeezing-reduced shot noise of the GW observatory GEO 600 was recently demonstrated (The LIGO Scientific Community, Nat. Physics 7 (2011) 962). The Einstein Telescope design study proposes squeezed-light injection to reduce shot noise as well as quantum radiation pressure noise by a factor of ten in power, i.e. by 10 dB. This contribution discusses the requirements posed by this goal, first on the ET squeezed-light laser and, second, on the interferometer optics, especially on the filter cavities necessary to obtain a frequency dependence of the squeezing angle.

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