Robust state transfer with high fidelity in spin-1/2 chains by Lyapunov control

TL;DR

This paper introduces a Lyapunov control-based scheme for high-fidelity quantum state transfer in spin-1/2 chains, emphasizing boundary control, robustness, and experimental feasibility.

Contribution

It proposes a boundary-only control method that is robust, scalable, and does not require precise timing, advancing quantum state transfer techniques.

Findings

Achieves high-fidelity state transfer with boundary control

Robust against initial state uncertainties and control fluctuations

Feasible with square pulse control for experimental implementation

Abstract

Based on the Lyapunov control, we present a scheme to realize state transfer with high fidelity by only modulating the boundary spins in a quantum spin-1/2 chain. Recall that the conventional transmission protocols aim at nonstationary state (or information) transfer from the first spin to the end spin at a fixed time. The present scheme possesses the following advantages. First, the scheme does not require precise manipulations of the control time. Second, it is robust against uncertainties in the initial states and fluctuations in the control fields. Third, the controls are exerted only on the boundary sites of the chain. It works for variable spin-1/2 chains with different periodic structures and has good scalability. The feasibility to replace the control fields by square pules is explored, which simplifies the realization in experiments.