Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.30: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Quantum interference in a Ti:LiNbO3 waveguide device as a tool for spectral shaping — •Jonas Babai-Hemati, Kai Hong Luo, Patrick Folge, Sebastian Lengeling, Philipp Mues, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

By exploiting optical interference, breakthroughs in research and metrology could be achieved. Traditional interferometers rely only on classical linear optical components, and therefore cannot benefit from quantum nature of light. Interferometers based on nonlinear optical components can utilize this potential by interference of quantum processes. This can lead to improved metrology properties and opens new possibilities in quantum state engineering. However, a free-space-based interferometer setup comes with challenges in stability and lacks scalability. To investigate the capability in state engineering of a fully integrated quantum interferometer, we fabricated an SU(1,1) like Ti:LiNbO3 waveguide based quantum interferometer device. The single waveguide structure is composed of two parametric down-conversion (PDC) sections separated by phase shifters (PS) and polarization converters (PC). With these modulators, the spectral shape of the quantum state resulting from the PDC-PDC interferences can be actively tailored. By theoretical and experimental study of this device, we explore the frame of tailorable states.

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