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Realization of the Einstein-Podolsky-Rosen paradox for continuous variables

1992; American Physical Society; Volume: 68; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.68.3663

1092-0145

Z. Y. Ou, S. F. Pereira, H. J. Kimble, K. C. Peng,

Quantum optics and atomic interactions

The Einstein-Podolsky-Rosen paradox is demonstrated experimentally for dynamical variables having a continuous spectrum. As opposed to previous work with discrete spin or polarization variables, the continuous optical amplitudes of a signal beam are inferred in turn from those of a spatially separated but strongly correlated idler beam generated by nondegenerate parametric amplification. The uncertainty product for the variances of these inferences is observed to be 0.70\ifmmode\pm\else\textpm\fi{}0.01, which is below the limit of unity required for the demonstration of the paradox.