Secure quantum-enhanced measurements on a network of sensors

TL;DR

This paper presents a hybrid quantum protocol that enables secure, high-precision measurements across large sensor networks by combining entangled and separable states, overcoming security limitations of previous methods.

Contribution

It introduces a novel hybrid protocol that maintains security and quantum-enhanced measurement precision in large-scale sensor networks, addressing exponential security decay.

Findings

Achieves secure quantum-enhanced measurements on large networks

Overcomes exponential security decay with hybrid entangled-separable states

Maintains measurement precision across any network size

Abstract

Two-party secure quantum remote sensing (SQRS) protocols enable quantum-enhanced measurements at remote locations with guaranteed security against eavesdroppers. This idea can be scaled up to networks of nodes where one party can directly measure functions of parameters at the different nodes using entangled states. However, the security on such networks decreases exponentially with the number of nodes. Here we show how this problem can be overcome in a hybrid protocol that utilises both entangled and separable states to achieve quantum-enhanced measurement precision and security on networks of any size.