Towards a down-conversion source of positively spectrally correlated and decorrelated photon pairs at telecom wavelength
Thomas A. Lutz, Piotr Leszek Kolenderski, Thomas D. Jennewein · 2013
The 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 down conversion (SPDC) source, based on a β-Barium Borate (BBO) 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, depicted in Fig. 1a), employs a carefully designed detection method exploiting two InGaAs detectors.