Levels of Quantum Correlations in the Continuous Variable Regime: Review and Experimental Illustrations with OPOs

摘要

We discuss different levels of quantum correlations in the continuous variable regime and illustrate them by means of experimental results with an optical parametric oscillators. More specifically, we report the first experimental generation of bright frequency-degenerate EPR beams with a type II OPO. Degeneracy is obtained by introducing a birefringent plate inside the cavity, resulting in phase locking. Correlation is characterized by homodyne detection.