Quantum correlations in a passive nonlinear optical fiber resonator
In recent experiments  a passive nonlinear optical fiber oscillator was stabilised and operated in several regimes showing bistability, modulational instability and period doubling. As well as showing these classical nonlinear phenomenons, nonlinear optical cavities can, in principle, generate quantum states of light such as two-mode squeezed states [2, 3. However, these quantum signatures in fibers are rather fragile and subject to noise from various sources such as coupling of the field modes to accoustical waves of the fiber (GAWBS) .
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