Polarization-entangled photon-pair source obtained via type-II non-collinear SPDC process with PPKTP crystal

We demonstrate a polarization-entangled photon-pair source obtained via a type-II non-collinear quasi-phase-matched spontaneous parametric down-conversion process with a 10-mm periodically poled KTiOPO4 crystal, which is as stable and wavelength-tunable as the well-known Sagnac configuration scheme....

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Bibliographic Details
Published in:Optics express 2016-02, Vol.24 (3), p.2941-2953
Main Authors: Lee, Sang Min, Kim, Heonoh, Cha, Myoungsik, Moon, Han Seb
Format: Article
Language:English
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Summary:We demonstrate a polarization-entangled photon-pair source obtained via a type-II non-collinear quasi-phase-matched spontaneous parametric down-conversion process with a 10-mm periodically poled KTiOPO4 crystal, which is as stable and wavelength-tunable as the well-known Sagnac configuration scheme. A brightness of 4.2 kHz/mW is detected and a concurrence of 0.975 is estimated using quantum state tomography. Without loss of entanglement and brightness, the photon-pair wavelengths are tunable through control of the crystal temperature. This improvement is achieved using the non-collinear configuration and a stable interferometric distinguishability compensator.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.002941