Fully Device-Independent Model on Quantum Networks

TL;DR

This paper develops a fully device-independent quantum network model using a new Bell inequality to verify multipartite nonlocality, enabling secure quantum communication and computation without trusting devices.

Contribution

It introduces a novel Bell inequality for quantum networks, establishing a fully device-independent framework for multipartite nonlocality and quantum information protocols.

Findings

Verified multipartite nonlocality in quantum networks

Constructed new monogamy relations for multisource resources

Applied model to quantum key distribution and secret sharing

Abstract

Bell inequality can provide a useful witness for device-independent applications with quantum (or post-quantum) eavesdroppers. This feature holds only for single entangled systems. Our goal is to explore device-independent model for quantum networks. We firstly propose a Bell inequality to verify the genuinely multipartite nonlocality of connected quantum networks including cyclic networks and universal quantum computational resources for measurement-based computation model. This is further used to construct new monogamy relation in a fully device-independent model with multisource quantum resources. It is finally applied for multiparty quantum key distribution, blind quantum computation, and quantum secret sharing. The present model can inspire various large-scale applications on quantum networks in a device-independent manner.