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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.41: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG
Cascaded Metasurface Interferometer for Multiport Beamsplitting for Quantum Applications — •Juan Nicolas Claro Rodriguez1, Rebecca Aschwanden1, Lingling Huang2, Klaus D. Jöns1, and Thomas Zentgraf1 — 1PhoQS Institute, CeOPP, and Department of Physics, Paderborn University, Paderborn — 2School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Beam splitters are fundamental optical components, typically implemented as 2X2 devices. Scaling to higher-dimensional operations demands cascading many of them, producing bulky setups with significant loss, critical in quantum optics. Photonic integrated circuits offer more compact designs but still suffer from scalability and flexibility challenges.
Flat optics, especially metasurfaces, provide a promising solution by enabling arbitrary wavefront shaping in a compact form factor. Most demonstrations of metasurface beam splitters focus on single-input, multiple-output operation, whereas advanced applications such as quantum interference require multi-input functionality.
Here we present a cascaded metasurface architecture that functions as a 4-input, 7-output beam splitter with reconfigurable splitting ratios. We characterize its performance using a CCD to extract the intensity distribution across output ports, and we demonstrate its suitability for quantum applications by interfacing it with a semiconductor quantum dot, observing single-photon multi-port interference and higher-order correlations.
Keywords: Metasurface; Semiconductor Quantum dots; Correlations