Parametric Down Conversion

Views Updated: Dec 15, 2025

Abbreviation

PDC

Pronunciation

/ˌpɛrəˈmɛtrɪk daʊn kənˈvərʒən/

We use the parametric down conversion to generate pseudo two-fold copy of four-dimensional two-photon state and measure its I-concurrence by detecting the photon bunching effect.
For the phase matching problem in spontaneous parametric down conversion, two models were put forward and analyzed.
Theoretical calculation and analysis based on non-collinear phase matching condition show that it comes from the type-I spontaneous parametric down conversion and its second harmonic generation, having the opposite sequence to the colored conical emission rings.
The quantum imaging experiment based on type ⅱ non collinear parametric down conversion is designed, including the preparation of quantum entanglement resource, data acquisition system and the configuration of quantum imaging.
The spontaneous parametric down conversion ( SPDC ) in the nonlinear crystal can generate photon pairs effectively. However the photon pairs generated by SPDC have very broad bandwidth, and can not couple with atomic ensemble effectively.

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