Observation of topological edge states in parity–time-symmetric quantum walks

• DOI: 10.1038/nphys4204
• Publication Date: 2017-07-31T15:02:19Z
• Authors: L. Xiao; X. Zhan; Z. H. Bian; K. K. Wang; X. Zhang; X. P. Wang; J. Li; K. Mochizuki; D. Kim; N. Kawakami; W. Yi; H. Obuse; B. C. Sanders; P. Xue
• Keywords: Quantum walk; Parity (physics); Floquet theory

Spontaneous parity–time-symmetry breaking and topological edge states are observed in a photonic non-Hermitian system — a quantum walk interferometer.