Quantum fluctuation and quantum entanglement in competing nonlinear processes of type II second-harmonic generation in a triple-resonant cavity is analyzed. Operating above threshold with intracavity loss, the mean amplitude and the entanglement of reflected subharmonic field as a function of pump and loss parameters are calculated. It is found that the two eigenmodes become unbalanced when internal loss intervenes. The dependence of the entanglement characteristics of two reflected subharmonic modes on output coupling efficiency µ_b/µ, pump parameter sigma, and normalized frequency Omega are discussed. Under appropriate conditions, this system can be exploited as a bright entanglement resource.
© 2005 Optical Society of America
Zehui Zhai, Hongxin Zou, Junxiang Zhang, and Jiangrui Gao, "Bright entanglement characteristics of subharmonic modes reflected from cavity for type II second-harmonic generation," J. Opt. Soc. Am. B 22, 878-883 (2005)