Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.38: Poster

Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer

Towards a fully integrated SU(1,1) interferometer in a periodically poled Ti:LiNbO3 waveguide — •Jonas Babai-Hemati, Kai Hong Luo, Raimund Ricken, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany

There is an increasing interest in quantum interferometers in metrology as they can outperform their classical counterparts. The most prominent quantum interferometer is a SU(1,1) interferometer, which has a Mach-Zehnder configuration with the conventional passive beam-splitters replaced by nonlinear parametric sections. We designed and fabricated a fully integrated SU(1,1) interferometer on a single LiNbO3 chip. Optical waves are guided in Ti-indiffused waveguides. The parametric sections comprise of periodically poled sections for type II phase-matched paramentric down-conversion (PDC) in the telecom range. A series of electrooptic polarization converters (PC) and two electrooptic phase-shifters allows the manipulation of the phase- and/or polarization state in between the nonlinear sections. The exact phase-matching of PDC and PC can be adjusted via temperature tuning in three separate sections of the chip. We report on the design and the fabrication of the integrated chip as well as on the classical characterization of the individual components forming the circuit. Quantum measurements to study the interferometer performance in phase-sensing as well as the use of such a device for tailored quantum state preparations are presently in a planning stage.

Keywords: SU(1,1) interferometer; Ti:LiNbO3 waveguides