Cross-Platform Verification in Quantum Networks

TL;DR

This paper proposes and analyzes efficient cross-platform verification protocols for quantum states in quantum networks, addressing the challenge of verifying computations on intermediate-scale devices, and demonstrates their implementation on current quantum processors.

Contribution

It introduces novel cross-platform verification protocols for quantum states and shows how they can be used to verify quantum computations, with practical implementation insights.

Findings

Protocols are efficient for verifying quantum states across distant nodes.

Experimental implementation on available quantum processors demonstrates feasibility.

Protocols can be integrated into laboratory quantum network setups.

Abstract

Intermediate-scale quantum devices are becoming more reliable, and may soon be harnessed to solve useful computational tasks. At the same time, common classical methods used to verify their computational output become intractable due to a prohibitive scaling of required resources with system size. Inspired by recent experimental progress, here we describe and analyze efficient cross-platform verification protocols for quantum states and show how these can be used to verify computations. We focus on the pair-wise comparison between distant nodes of a quantum network, identify the most promising protocols and then discuss how they can be implemented in laboratory settings. As a proof of principle, we implement basic versions of these schemes on available quantum processors.