Idealized Einstein-Podolsky-Rosen states from non–phase-matched parametric down-conversion
Idealized Einstein-Podolsky-Rosen states from non–phase-matched parametric down-conversion
The most common source of entangled photons is spontaneous parametric down-conversion (SPDC). The degree of energy and momentum entanglement in SPDC is determined by the nonlinear interaction volume. By reducing the length of a highly nonlinear material, we relax the longitudinal phase-matching condition and reach record levels of transverse momentum …