Self-testing with dishonest parties and device-independent entanglement certification in quantum networks

TL;DR

This paper develops a protocol for device-independent quantum state certification in networks with dishonest parties, enabling robust verification of entanglement even when some nodes collude, with applications to GHZ and cluster states.

Contribution

It introduces the concept of self-testing with dishonest parties and extends state certification methods to scenarios with colluding nodes in quantum networks.

Findings

Protocol for self-testing GHZ states with dishonest parties

Robust fidelity bounds for shared quantum states

Extension to cluster states with collusion scenarios

Abstract

Here we consider the task of device-independent certification of the quantum state distributed in a network when some of the nodes in this network may collude and act dishonestly. We introduce the paradigm of self-testing with dishonest parties and present a protocol to self-test the GHZ state in this framework. We apply this result for state certification in a network with dishonest parties and also provide robust statements about the fidelity of the shared state. Finally, we extend our results to the cluster scenario, where several subgroups of parties may collude during the state certification. Our findings provide a new operational motivation for the strong definition of genuine multipartite nonlocality as originally introduced by Svetlichny in [PRD 35, 3066 (1987)].