Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths

Year: 2014

Authors: Bruno N., Martin A., Guerreiro T., Sanguinetti B., Thew R.T.

Autors Affiliation: Univ Geneva, Appl Phys Grp, CH-1211 Geneva 4, Switzerland.

Abstract: We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter-propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g (2) measurements. We obtain a spectral purity of 0.91 and coupling efficiencies around 90% for all four photons without any filtering. These pure indistinguishable photon sources at telecom wavelengths are perfectly adapted for quantum network demonstrations and other multi-photon protocols. (C) 2014 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 22 (14)      Pages from: 17246  to: 17253

More Information: The authors thank H. Zbinden, N. Gisin, C. Osorio and J. Schaake for useful discussions. This work was partially supported by the Swiss NCCR-QSIT project.
KeyWords: Quantum; Pairs
DOI: 10.1364/OE.22.017246

Citations: 57
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