Abstract

We present a theoretical model of nonclassical state generation in a pair of identical coupled nonlinear cavities operating in the below threshold optical parametric oscillator regime [1]. We show that the introduction of nonlinearity enables arbitrarily strong entanglement to be generated. Interestingly, 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. For example, an all-optical quantum memory could be implemented utilizing asynchronous entanglement as the nonclassical resource for quantum teleportation[2], It is shown that entanglement can be shifted far from resonance. This is of technical significance, allowing the optimal entanglement to be moved away from low frequency noise sources such as the laser relaxation oscillation which typically limit both entanglement strength and purity.

© 2009 IEEE