1. What have the authors contributed in "Sensitivity studies for third-generation gravitational wave observatories" ?
In this paper the authors describe sensitivity models for ET and investigate potential limits imposed by fundamental noise sources.
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2. What are the future works in "Sensitivity studies for third-generation gravitational wave observatories" ?
In the future, the authors plan to further refine their sensitivity models by including noise contributions from optical components outside the arm and filter cavities as well as by taking technical contributions such as laser frequency and laser amplitude noise into account.
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![Figure 2. Left panel: gravity-gradient noise contribution to ET, for various β values, assuming the BFO spectrum shown in figure 1 as the seismic excitation level. Right panel: suspension thermal noise of the low-frequency interferometer of ET as described in [34].](/figures/figure-2-left-panel-gravity-gradient-noise-contribution-to-866ijshm.webp)
![Figure 6. Historical evolution of sensitivity models for the Einstein Telescope, starting from a single cryogenic broadband detector (ET-B) [11], over the initial xylophone design (ET-C) [13] to the ET-D sensitivity described in this paper.](/figures/figure-6-historical-evolution-of-sensitivity-models-for-the-1gp0ige0.webp)
![Figure 3. Left panel: simplified schematic of an ET interferometer. Quantum-noise suppression is achieved by the injection of squeezed light states with a frequency-dependent squeezing angle. The frequency-dependent rotation of the squeezing angle can be realized by using the dispersion of filter cavities, on which the squeezed light is reflected. Each ET low-frequency interferometer will require two filter cavities, while each high-frequency interferometer only requires a single filter cavity. Right-hand panel: quantum-noise contribution of the ET low-frequency interferometer, as described in [13] (dashed line) and with squeezing losses from filter cavities taken into account (solid line) [27].](/figures/figure-3-left-panel-simplified-schematic-of-an-et-2a1vqp2v.webp)
