Fast and robust quantum state transfer via a topological chain

TL;DR

This paper introduces a fast, robust quantum state transfer method using a time-driven topological chain, leveraging resonant effects and optimal control to outperform other protocols in speed and noise resilience.

Contribution

It presents a novel exponential time-driving protocol for topological quantum state transfer that is near-optimal and more robust than adiabatic or trivial-chain methods.

Findings

The exponential driving protocol speeds up state transfer.

The protocol shows high resilience to static noise.

Comparison confirms superior performance over other methods.

Abstract

We propose a fast and robust quantum state transfer protocol employing a Su-Schrieffer-Heeger chain, where the interchain couplings vary in time. Based on simple considerations around the terms involved in the definition of the adiabatic invariant, we construct an exponential time-driving function that successfully takes advantage of resonant effects to speed up the transfer process. Using optimal control theory, we confirm that the proposed time-driving function is close to optimal. To unravel the crucial aspects of our construction, we proceed to a comparison with two other protocols. One where the underlying Su-Schrieffer-Heeger chain is adiabatically time-driven and another where the underlying chain is topologically trivial and resonant effects are at work. By numerically investigating the resilience of each protocol to static noise, we highlight the robustness of the exponential driving.