Disorder-Induced Dephasing in Backscattering-Free Quantum Transport

作者：Gneiting Clemens^*; Nori Franco^*

来源：Physical Review Letters, 2017, 119(17): 176802.

DOI：10.1103/PhysRevLett.119.176802

We analyze the disorder-perturbed transport of quantum states in the absence of backscattering. This comprises, for instance, the propagation of edge-mode wave packets in topological insulators, or the propagation of photons in inhomogeneous media. We quantify the disorder-induced dephasing, which we show to be bound. Moreover, we identify a gap condition to remain in the backscattering-free regime despite disorder-induced momentum broadening. Our analysis comprises the full disorder-averaged quantum state, on the level of both populations and coherences, appreciating states as potential carriers of quantum information. The well-definedness of states is guaranteed by our treatment of the nonequilibrium dynamics with Lindblad master equations.

• 出版日期2017-10-23
• 单位RIKEN