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Figure 37: Schemes of interferometer with the single filter cavity. Left: In the pre-filtering scheme,
squeezed vacuum from the squeezor is injected into the signal port of the interferometer after the
reflection from the filter cavity; right: in the post-filtering scheme, a squeezed vacuum first passes
through the interferometer and, coming out, gets reflected from the filter cavity. In both cases the
readout is performed by an ordinary homodyne detector with frequency independent homodyne angle
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