Persistence of Topological Phases in Non-Hermitian Quantum Walks
arXiv:2007.15500 · doi:10.1038/s41598-021-89441-8
Abstract
Discrete-time quantum walks are known to exhibit exotic topological states and phases. Physical realization of quantum walks in a noisy environment may destroy these phases. We investigate the behavior of topological states in quantum walks in the presence of a lossy environment. The environmental effects in the quantum walk dynamics are addressed using the non-Hermitian Hamiltonian approach. We show that the topological phases of the quantum walks are robust against moderate losses. The topological order in one-dimensional split-step quantum walk persists as long as the Hamiltonian is -symmetric. Although the topological nature persists in two-dimensional quantum walks as well, the -symmetry has no role to play there. Furthermore, we observe the noise-induced topological phase transition in two-dimensional quantum walks.
arXiv comment15 pages, 8 figures. Comments or suggestions are most welcome
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