Quantum 2025 – wissenschaftliches Programm

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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.35: Poster

Donnerstag, 11. September 2025, 16:30–18:30, ZHG Foyer 1. OG

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

Quantum technologies represent a promising advancement in fields such as metrology, computing, and secure data transmission. Among the various platforms available, waveguide-integrated photonic systems have emerged as a particularly promising approach for implementing these quantum operations. In these systems, two-photon quantum states form the simplest building blocks that can exhibit quantum effects like entanglement. These states can be efficiently generated through a quantum process known as parametric down-conversion (PDC) implemented in waveguide devices. However, the use of only a single PDC process offers limited flexibility in tailoring quantum properties. A new approach to extend the frame of tailorable quantum properties lies in the interference of multiple generation processes like the PDC in a so-called SU(1,1) interferometer. In this work, we present a two-PDC integrated Ti:LiNbO3 waveguide interferometer featuring a cascade of nine electro-optic polarization converters and two phase shifters. Simulations were performed to analyze the spectral and temporal correlations of the quantum states generated by such a device. These simulations were validated using both classical and quantum measurement methods.

Keywords: Ti:LiNbO3 waveguides; SU(1,1) interferometer; Time and frequency entanglement