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We report on the preparation of entangled two mode squeezed states of yetunseen quality. Based on a measurement of the covariance matrix we found aviolation of the Reid and Drummond EPR-criterion at a value of only 0.36\pm0.03compared to the threshold of 1. Furthermore, quantum state tomography was usedto extract a single photon Fock state solely based on homodyne detection,demonstrating the strong quantum features of this pair of laser-beams. Theprobability for a single photon in this ensemble measurement exceeded 2/3.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Demonstrating various quantum effects with two entangled laser beams