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A description is given of a device that periodically transforms a field from the vacuum state to a pure excited state that corresponds to the propagation of two correlated photons. It employs the phenomenon of parametric scattering, i.e., the emission of pairs of photons by a nonlinear crystal excited by a pulsed coherent pump under phase-matched conditions. In accordance with the wellknown Einstein-Podolsky-Rosen gedanken experiment, the device can be used to observe the correlation of eitherdoi:10.1070/pu1988v031n01abeh002537 fatcat:tdajwsntjrcupcja2bxpbf4rxy