ArticleScience advances2023
Experimental simulation of symmetry-protected higher-order exceptional points with single photons.
Article in Science advances, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Experimental witness of quantum jump induced high-order Liouvillian exceptional points.Nature communications · 2026Article
- Quantum tomography of a third-order exceptional point in a dissipative trapped ion.Nature communications · 2025Article
- Experimental investigation of non-Hermitian physics in the quantum regime.National science review · 2025Article
- Exceptional point and hysteresis trajectories in cold Rydberg atomic gases.Nature communications · 2025Article
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Authors and funding
6 authors.
Funding
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Abstract
Exceptional points (EPs) of non-Hermitian (NH) systems have recently attracted increasing attention due to their rich phenomenology and intriguing applications. Compared to the predominantly studied second-order EPs, higher-order EPs have been assumed to play a much less prominent role because they generically require the tuning of more parameters. Here, we experimentally simulate two-dimensional topological NH band structures using single-photon interferometry, and observe topologically stable third-order EPs obtained by tuning only two real parameters in the presence of symmetry. In particular, we explore how different symmetries stabilize qualitatively different third-order EPs: the parity-time symmetry leads to a generic cube-root dispersion, while a generalized chiral symmetry implies a square-root dispersion coexisting with a flat band. Additionally, we simulate fourfold degeneracies, composed of the non-defective twofold degeneracies and second-order EPs. Our work reveals the abundant and conceptually richer higher-order EPs protected by symmetries and offers a versatile platform for further research on topological NH systems.
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