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Can a setup be made such that the efficiency of spontaneous parametric downconversion approaches 100%? From what I have been told, this would be possible using classical input fields matching both the pump and output frequencies, but I am unsure if one could simply use laser of both frequencies on the crystal, or if one would need to apply electric fields on the crystal with an electromagnetic coil at the proper number of Teslas. Is this true, and if so, what might the details of the setup be? Alternatively, might there be any other methods of accomplishing this?