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Q: Fachverband Quantenoptik und Photonik

Q 30: Quantum Optics (Miscellaneous) IV

Q 30.3: Vortrag

Mittwoch, 16. März 2022, 11:15–11:30, Q-H14

Simulation and fabrictaion of periodically poled waveguides in KTP for quantum state preparation — •Johannes Otte, Laura Padberg, Christof Eigner, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn

Photonic quantum communication and computing require reliable and highly quality quantum state preparation. Therefore, highly efficient sources of photons with high purity and brightness are necessary. One of the materials of choice for such a photon pair source is KTP. It offers the advantages of a wide transparency range from IR to UV, high mechanical and chemical resistance, large non-linear coefficients and low refractive index change with temperature. The dispersion properties makes it unique for quantum state generation, e.g. for decorelated photon pairs at 1550 nm. Waveguides fabrication as well as period poling for quasi-phase-matching is possible in KTP, which drastically increases the efficiency of photon sources. Thus, photon sources in periodically poled KTP are highly desirable for quantum optics applications. However, the fabrication of periodocally poled waveguides in KTP is still a challenging task, which requries a profound understanding of the material behaviour. For an improvement of the fabrication of periodically poled KTP waveguides, simulations of the poling behaviour near the crystall surface leading to a better understanding of the generated domain structure. We show our recent results of the modelling for poling dynamics in rubidium exchanged waveguides.