FIG. 1. (a) Schematic diagram of a setup for USC of the squeezed vacuum states S(ξ )|0〉 and S(ζ )|0〉. (b) Scheme leading to the same output state |'out(ξ,ζ )〉〉 as in (a) when the two squeezing phases are unknown but equal, i.e., arg(ξ ) = arg(ζ ). We defined r± = (ξ ± ζ )/2. See the text for comments and details.
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