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This paper demonstrates the nonlinear system of the smallest order for direct tripartite entanglement production. An optical parametric oscillator operating above threshold produces an inseparable state of pump, signal and idler modes. Previous attempts had been frustrated by the presence of an extra noise source, which is shown to be generated by photon scattering of light due to thermal phonons...
An Optical Parametric Oscillator entangles three modes of the field - pump, signal and idler - when operating above threshold. Complete measurement of the covariance matrix enables the test of several inseparability criteria.
This paper presents an experimental demonstration of three-color quantum correlations between the bright pump, signal, and idler beams produced by an optical parametric oscillator (OPO). This paper shows that the degree of entanglement between the twin beams can be increased by using information from the pump beam.
We propose a direct measurement of the quadrature correlations of signal and idler beams in a non-degenerate optical parametric oscillator operating above threshold. We investigate the experimental limits where quantum correlations can be observed, fulfilling an inseparability criterion for defining them as intense entangled beams. The use of optical cavities to access quadrature noise in this situation...
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