Entanglement Verification in Quantum Networks with Tampered Nodes

TL;DR

This paper introduces two LOCC-based protocols for verifying entanglement between nodes in a quantum network, aiming to detect intruders controlling nodes without requiring global operations.

Contribution

It presents novel entanglement verification protocols that are more robust and efficient, specifically designed for quantum networks with potentially compromised nodes.

Findings

Protocols successfully detect intruder-controlled nodes

Protocols operate using only local operations and classical communication

Enhanced robustness and efficiency over existing methods

Abstract

In this paper, we consider the problem of entanglement verification across the quantum memories of any two nodes of a quantum network. Its solution can be a means for detecting (albeit not preventing) the presence of intruders that have taken full control of a node, either to make a denial-of-service attack or to reprogram the node. Looking for strategies that only require local operations and classical communication (LOCC), we propose two entanglement verification protocols characterized by increasing robustness and efficiency.