Time-optimal transfer of the quantum state in long qubit arrays

TL;DR

This paper develops an optimal control method for fast, high-fidelity quantum state transfer in large arrays of coupled qubits, addressing a key challenge in scalable quantum computing.

Contribution

It introduces a new optimal control strategy for quantum state transfer in long qubit arrays, achieving maximal fidelity in minimal time.

Findings

Achieves near-perfect state transfer in minimal time

Provides a scalable control protocol for large qubit arrays

Enhances the efficiency of quantum information transfer

Abstract

Recent technological advances have allowed the fabrication of large arrays of coupled qubits serving as prototypes of quantum processors. However, the optimal control of such systems is notoriously hard, which limits the potential of large-scale quantum systems. Here, we investigate a model problem of quantum state transfer in a large nearest-neighbor-coupled qubit array and derive an optimal control that simultaneously enables maximal fidelity and minimal time of the transfer.