Asynchronous entanglement from coherently coupled nonlinear cavities

The paper presents a theoretical model of non-classical state generation in a pair of identical coupled nonlinear cavities operating in the below threshold optical parametric oscillator regime. The introduction of nonlinearity enables arbitrarily strong entanglement to be generated. However, for strong coupling, the entanglement is quenched, and a new form of asynchronous entanglement exhibiting time-delayed quantum correlations becomes apparent. The asynchronous entanglement predicted here has many applications in quantum information science.