Fast high-fidelity multi-qubit state transfer with long-range interactions

TL;DR

This paper presents a protocol for efficient multi-qubit quantum state transfer over long distances using Hamiltonian dynamics with long-range interactions, achieving transfer time proportional to the square root of the number of qubits, and maintaining finite fidelity despite errors.

Contribution

It introduces a novel protocol that enables fast, high-fidelity multi-qubit state transfer leveraging long-range interactions without requiring error correction.

Findings

Transfer time scales as √n for n qubits.

Fidelity remains finite despite uncorrelated random errors.

Protocol works over arbitrarily large distances.

Abstract

We describe an efficient protocol to perform quantum state transfer using Hamiltonian dynamics with long-range interactions. The time to transfer $n$ qubits a sufficiently large distance is proportional to $\sqrt{n}$. Even without error correction, the fidelity of this multi-qubit state transfer process remains finite for arbitrarily well-separated qubits in the presence of uncorrelated random errors in coupling constants.