Toward a downconversion source of positively spectrally correlated and decorrelated telecom photon pairs
Thomas Lutz, Piotr Leszek Kolenderski, Thomas Jennewein · Optics Letters · 2013
Frequency correlation (or decorrelation) of photon pairs is of great importance in long-range quantum communications and photonic quantum computing. We experimentally characterize a spontaneous parametric downconversion source, based on a β-barium borate crystal cut for type-II phase matching at 1550 nm, which has the capability to emit photons with positive or no spectral correlations. Our system employs a carefully designed detection method exploiting two InGaAs detectors.