Photon-triplets for quantum optics generated by a phase-matched third-order difference-frequency mixing in a KTiOPO4 bulk crystal pumped at 532 nm

TL;DR

This paper demonstrates an efficient method for generating photon triplets using difference-frequency-mixing in a KTP crystal, achieving a flux of 11.6 triplets/sec, supported by experimental and semiclassical modeling.

Contribution

The work introduces a novel photon-triplet generation technique using phase-matched third-order difference-frequency mixing in a bulk crystal, with experimental validation and theoretical modeling.

Findings

Achieved a photon-triplet flux of 11.6 per second.

Experimental results align with semiclassical quantum fluctuation models.

Demonstrated effective photon-triplet generation in a KTP crystal.

Abstract

We report implementation and modelling of an efficient photon-triplets generation experiment based on a difference-frequency-mixing of two picosecond beams at 532 nm and 1491 nm in a type II phase-matched KTP crystal. The photon-triplets flux was measured as a function of the energy of the two incident beams using a coincidence protocol. A maximal flux of 11.6 photon-triplets per second was achieved. These experimental data were satisfactorily described by a semiclassical model based on the quantum fluctuations of vacuum and the classical equations of nonlinear optics.