Quantum 2025 – wissenschaftliches Programm
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MON: Monday Contributed Sessions
MON 1: QIP Implementations: Photons I
MON 1.7: Vortrag
Montag, 8. September 2025, 15:45–16:00, ZHG001
Topology-Optimized Integrated Photonics for Quantum Experiments — •Shiang-Yu Huang1, Shreya Kumar1, Jeldrik Huster1, Yannick Augenstein2, Carsten Rockstuhl2,3, and Stefanie Barz1,4 — 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany — 2Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 3Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany — 4Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart, 70569 Stuttgart, Germany
Interference of single photons plays a central role in photonic quantum technologies as it is an essential process for creating and manipulating desired quantum states in linear optical systems. By incorporating integrated photonics, multiphoton interference can take place within on-chip interferometers featuring a minimal footprint. Furthermore, such devices can be miniaturized even further by applying inverse design methods, showing a promising path for innovating conventional integrated systems for photonic quantum technologies. Here we demonstrate the inverse-designed interferometers developed using topology optimization with an ultracompact footprint. We showcase their capabilities for quantum experiments through multiphoton interference. We also inversely design on-chip couplers to facilitate high-efficiency interconnection with an exceptionally small footprint. These topology-optimized components have great potential for building up high integration density integrated circuits for photonic quantum technologies.
Keywords: inverse design; topology optimization; multiphoton interference; multiport beam splitter