Harmonic Entanglement with Second-Order Nonlinearity
Nicolai B. Grosse, Warwick P. Bowen, Kirk McKenzie, Ping Koy Lam · Physical Review Letters · 2006
We investigate the second-order nonlinear interaction as a means to generate entanglement between fields of differing wavelengths and show that perfect entanglement can, in principle, be produced between the fundamental and second-harmonic fields in these processes. Neither pure second-harmonic generation nor parametric oscillation optimally produce entanglement; such optimal entanglement is rather produced by an intermediate process.