Crossing exceptional points in non-Hermitian quantum systems
- URL: http://arxiv.org/abs/2407.12578v1
- Date: Wed, 17 Jul 2024 14:04:00 GMT
- Title: Crossing exceptional points in non-Hermitian quantum systems
- Authors: Friederike U. J. Klauck, Matthias Heinrich, Alexander Szameit, Tom A. W. Wolterink,
- Abstract summary: We reveal the behavior of two-photon quantum states in non-Hermitian systems across the exceptional point.
We demonstrate a switching in the quantum interference of photons directly at the exceptional point.
- Score: 41.94295877935867
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Exceptional points facilitate peculiar dynamics in non-Hermitian systems. Yet, in photonics, they have mainly been studied in the classical realm. In this work, we reveal the behavior of two-photon quantum states in non-Hermitian systems across the exceptional point. We probe the lossy directional coupler with an indistinguishable two-photon input state and observe distinct changes of the quantum correlations at the output as the system undergoes spontaneous breaking of parity-time symmetry. Moreover, we demonstrate a switching in the quantum interference of photons directly at the exceptional point, where Hong-Ou-Mandel dips are transformed into peaks by a change of basis. These results show that quantum interference and exceptional points are linked in curious ways that can now be further explored.
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