ArticleNational science review2023
Observation of dark edge states in parity-time-symmetric quantum dynamics.
Article in National science review, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Self-normal and biorthogonal dynamical quantum phase transitions in non-Hermitian quantum walks.Light, science & applications · 2025Article
- Emergence of Classical Random Walk from Non-Hermitian Effects in Quantum Kicked Rotor.Entropy (Basel, Switzerland) · 2025Article
- Experimental revival of an unknown state from the past in quantum walks.National science review · 2025Article
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5 authors.
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Abstract
Topological edge states arise in non-Hermitian parity-time ([Formula: see text])-symmetric systems, and manifest themselves as bright or dark edge states, depending on the imaginary components of their eigenenergies. As the spatial probabilities of dark edge states are suppressed during the non-unitary dynamics, it is a challenge to observe them experimentally. Here we report the experimental detection of dark edge states in photonic quantum walks with spontaneously broken [Formula: see text] symmetry, thus providing a complete description of the topological phenomena therein. We experimentally confirm that the global Berry phase in [Formula: see text]-symmetric quantum-walk dynamics unambiguously defines topological invariants of the system in both the [Formula: see text]-symmetry-unbroken and -broken regimes. Our results establish a unified framework for characterizing topology in [Formula: see text]-symmetric quantum-walk dynamics, and provide a useful method to observe topological phenomena in [Formula: see text]-symmetric non-Hermitian systems in general.
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