Zhan, X. ., Xiao, L. ., Bian, Z. ., Wang, K. ., Qiu, X. ., Sanders, B. ., … Xue, P. . (2017). Detecting Topological Invariants in Nonunitary Discrete-Time Quantum Walks. Physical Review Letters, 119(13), 130501. https://doi.org/10.1103/PhysRevLett.119.130501 (Original work published 2017)