Higher-order exceptional points in a non-reciprocal waveguide beam splitter
Year: 2025
Type: article
Abstract: Non-Hermitian systems have attracted significant interest because of their intriguing properties, including exceptional points (EPs), where eigenvalues and the corresponding eigenstates coalesce. In particular, quantum systems with EPs exhibit an enhanced sensitivity to external perturbations, which increases with the order of the EP. Therefore, higher-order EPs hold significant potential for advanced sensing applications, but they are challenging to achieve due to stringent symmetry requirements. In this work, we study the dynamics of a generalized lossy waveguide beam splitter with asymmetric coupling by introducing non-reciprocity as a tunable parameter to achieve higher-order EPs even without dissipation. Moreover, we analyze the evolution of NOON-states under activated non-reciprocity, highlighting its impact on quantum systems. Our results open new pathways for realizing higher-order EPs in non-reciprocal open quantum systems.
Source: Optics Express
DOI: 10.1364/oe.563594
Institution: Technical University of Munich
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: G1062995055, Verbundprojekt: Quantenkommunikation für Internet-of-Things-Netzwerke - QUIET -, G177143538, Verbundprojekt: Quanten Drahtloses Campusnetzwerk - QD-CamNetz - , Teilvorhaben: TP-Boche: Quantenklassische Verbindungen, TP-Deppe: Quantenklassischen Verbindungsschicht Protokolle, TP-Nötzel: Quantenklassiche Simulations/Emulations-Plattform, RUI: Robust Exceptional Points and their Application in Harmonic Generation, Verbundprojekt: Digitale Transformation und Souveränität künftiger Kommunikationsnetze - 6G-life -, Teilvorhaben: Grundlagen und Systemlösungen für Post Shannon Kommunikation, In-Network Computing, eingebettete Sicherheit und Resilienz, G3563359340, G4082377686, ExpandQISE:Track 1: Photonic Lattices for Robust All-Optical Quantum Devices, G5018688533, G5519890835, Verbundprojekt: Quantum Physical Layer Service Integration - QuaPhySI -, Teilvorhaben: Netzkonzepte und Theoretische Grundlagen, G6991234108, G7472567491, Verbundprojekt: Quantentoken Theorie und Anwendungen - QTOK -, Teilvorhaben: Modellierung und Simulation für Quantentoken-basierte Authentifizierung und sichere Speicherung
OpenAlex ID: W4410789363