Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.27: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
Hybrid photonic circuits for fundamental quantum physics — •Yigit Erarslan1, Alessandro Palermo2, Zoya Polschykova2, Akhil Gupta3, Josef Hloušek1, Gregor Weihs1, Rachel Grange2, Robert Chapman2, Tobias Vogl3, and Robert Keil1 — 1Universität Innsbruck, Innsbruck, Austria — 2ETH Zurich, Zurich, Switzerland — 3Technical University of Munich, Munich, Germany.
Quantum mechanics accurately describes microscopic and many mesoscopic phenomena, yet it relies on postulates that must ultimately be tested experimentally.
We are developing an experimental platform to test two such foundations: the Born rule and the complex-valued nature of quantum amplitudes. Using single-photon multi-path interferometers, we aim to improve the accuracy of these tests by about one order of magnitude compared to the current state of the art, thereby narrowing the parameter space of generalised quantum theories.
The platform is a hybrid quantum system combining room-temperature single-photon emitters based on hexagonal boron nitride, quantum frequency conversion from visible wavelengths to the telecom C-band, and waveguide interferometers on a single lithium-niobate-on-insulator photonic chip. The contribution will present the experimental concept, the planned hybrid photonic circuit, the required steps for its fabrication and characterisation, as well as the targeted sensitivities for these precision tests.
Keywords: Integrated photonics; Solid state emitters; Fundamental quantum tests; Hybrid integration; Quantum frequency conversion