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Recent experiments with optical parametric oscillators have shown that an unpredicted extra noise on the phase of the fields reduces the level of squeezing or quantum correlations. In some cases, it can hinder the attempts to observe entanglement in those systems. It is probably the main reason why signal and idler entanglement above threshold remained unobserved by almost 20 years after its prediction...
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.
Summary form only given. Several measurement methods of nonlinear optical Kerr coefficient n/sub 2/ in optical fibers have recently been proposed, bringing into evidence the different contributions of the electronic and electrostrictive parts, respectively n/sub 2k/ and n/sub 2e/, where electrostriction plays an important role at optical modulation frequency lower than 1.5 GHz, and is intrinsically...
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