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Observation of Novel Robust Edge States in Dissipative Non‐Hermitian Quantum Walks
Author(s) -
Wang Bo,
Chen Tian,
Zhang Xiangdong
Publication year - 2020
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000092
Subject(s) - hermitian matrix , physics , dissipative system , quantum walk , parity (physics) , enhanced data rates for gsm evolution , quantum , phase transition , quantum mechanics , topology (electrical circuits) , statistical physics , quantum computer , mathematics , computer science , telecommunications , combinatorics
Recently, the study of non‐Hermitian physics has attracted considerable attention. The modified bulk‐boundary correspondence has been proposed to understand topological edge states in non‐Hermitian static systems. Here, a new experimental observation of edge states in non‐Hermitian time‐driven systems (quantum walks) is reported. Topologically edge states protected by Hermitian conjugation of particle–hole symmetry (PHS†) are found in the unbroken parity–time (PT)‐symmetric phase. When the system changes from the unbroken to the broken PT‐symmetric phase, the topological phase transition occurs accompanied by the change of the number of edge states. The robust properties of these edge states against static perturbations and disorder are also demonstrated experimentally. The finding of robust edge states in non‐Hermitian systems inspires to explore a robust transport channel in ubiquitously complex systems with strong dissipation.