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Synthesis of the Einstein-Podolsky-Rosen entangled state --- the primaryentangled resource in continuous-variable quantum-optical informationprocessing --- is a technological challenge of great importance. Here wepropose and implement a new scheme of generating this state. Two nonlinearoptical crystals, positioned back-to-back in the waist of a pump beam, functionas single-pass degenerate optical parametric amplifiers and produce single-modesqueezed vacuum states in orthogonal polarization modes, but in the samespatiotemporal mode. A subsequent pair of waveplates acts as a beam splitter,entangling the two polarization modes to generate the Einstein-Podolsky-Rosenstate. This technique takes advantage of the strong nonlinearity associatedwith type-I phase-matching configuration while at the same time eliminating theneed for actively stabilizing the optical phase between the two squeezers,which typically arises if these squeezers are spatially separated. Wedemonstrate our method in an experiment, preparing a 1.4 dB two-mode squeezedstate and characterizing it via two-mode homodyne tomography.

Synthesis of the Einstein-Podolsky-Rosen entanglement in a sequence of two single-mode squeezers