Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.33: Poster

Dienstag, 12. März 2024, 17:00–19:00, Tent B

Integrated electro-optic modulators in LiNbO₃ as fundamental building blocks for quantum photonic circuits — •Noel Heinen, Michelle Kirsch, Sattibabu Romala, Sebastian Lengeling, Harald Herrmann, Laura Padberg, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Institut für Photonische Quantensysteme, Warburger Str. 100, D-33098 Paderborn

Numerous applications in quantum communication and quantum processing require electric manipulation of photonic quantum states. Thus, electro-optic modulators (EOMs) are key components for photonic integrated circuits (PICs). A suitable and widely used material platform for EOMs is lithium niobate (LN) due to its high electro-optic coefficient and broad transparency window. Recent developments in integrated optics show that thin film lithium niobate (TFLN) is a highly versatile and promising material platform. Due to a drastically higher mode confinement than in titanium indiffused LN waveguides, nonlinear effects and integration density are further enhanced. The increase in modulation efficiency leads to higher modulation speeds and power efficiencies, as lower modulation voltages are required. Therefore programmable circuits for quantum information processing can be realized, as fast modulation is needed. As the fundamental building block of EOMs are phase shifters, we cover the fabrication process of TFLN phase modulators and compare their benefits over conventional diffused LN phase modulators with respect to their optical and electrical properties.

Keywords: LN; TFLN; LNOI; EOM