Entanglement characteristics of subharmonic modes reflected from cavity for type II second harmonic generation

摘要

Quantum fluctuation and quantum entanglement of the pump field reflected froman optical cavity for type II second harmonic generation are theoreticallyanalyzed. The correlation spectra between the quadratures of the reflectedsubharmonic fields are interpreted in terms of pump parameter, intracavitylosses and normalized frequency. Large correlation degrees of both amplitudeand phase quadratures can be accessed in a triple resonant cavity before thepitchfork bifurcation occurs. The two reflected subharmonic fields are in anentangled state with the quantum correlation of phase quadratures andanticorrelation of amplitude quadratures. The proposed system can be exploitedto be a new source generating entangled states of continuous variables.