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The two modes of the Einstein-Podolsky-Rosen quadrature entangled stategenerated by parametric down-conversion interfere on a beam splitter ofvariable splitting ratio. Detection of a photon in one of the beam splitteroutput channels heralds preparation of a signal state in the other, which ischaracterized using homodyne tomography. By controlling the beam splittingratio, the signal state can be chosen anywhere between the single-photon andsqueezed state.

A bridge between the single-photon and squeezed-vacuum state