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Demonstrating quantum properties of triple photons generated by χ3 processes

Triple-photon generation (TPG) based on a third-order nonlinear optical interaction is the direct way to produce pure triple-photon states. These states exhibit three-body quantum correlations, different from twin-photon states, making them useful for new quantum information tasks. The first experimental demonstration, using a bi-stimulation scheme in a bulk KTP crystal has been followed by the TPG quantum theory. New challenges to achieve spontaneous TPG is to use ridge waveguides to ensure birefringence phase-matching and light confinement. After a review of our work on TPG including quantum modeling, theoretical tools for the certification of spontaneous TPG quantum features are developped.