Fast and high-fidelity transfer of edge states via dynamical control of topological phases and effects of dissipation

TL;DR

This paper proposes a relativistic-inspired, high-fidelity method for transferring topological edge states by dynamically moving domain walls, demonstrating robustness against dissipation and feasibility with current quantum walk technology.

Contribution

It introduces a novel relativistic approach to dynamically control topological edge states for quantum information applications, including analysis of dissipation effects.

Findings

High-fidelity transfer of edge states achieved via domain wall motion

Relativistic effects explain robustness against dissipation

Method feasible with current quantum walk experimental setups

Abstract

Topological edge states are robust against symmetry-preserving perturbations and noise, making them promising for quantum information and computation, particularly in topological quantum computation through braiding operations of Majorana quasiparticles. Realizing these applications requires fast and high-fidelity dynamic control of edge states. In this work, we theoretically propose a high-fidelity method for transferring one-dimensional topological edge states by dynamically moving a domain wall between regions of different topological numbers. This method fundamentally relies on Lorentz invariance and relativistic effects, as moving the domain wall at a constant speed results in the problem into the uniform linear motion of a particle obeying a Dirac equation. We demonstrate effectiveness of our method in transferring edge states with high fidelity using a one-dimensional quantum walk with two internal states, which is feasible with current experimental technology. We also investigate how bit and phase-flip dissipation from environment affects transfer efficiency. Remarkably, these dissipation have minimal effects on efficiency at slow and fast transfer limits, respectively, which can be explained by relativistic effects to the edge states.