Secure Quantum Remote Sensing Without Entanglement

TL;DR

This paper introduces an entanglement-free quantum remote sensing method that simplifies implementation while maintaining quantum advantages in measurement precision and security, bridging quantum metrology and communication.

Contribution

It presents a novel entanglement-free scheme for quantum remote sensing, enhancing practicality and security over entanglement-based approaches.

Findings

Achieves quantum-enhanced measurement precision.

Provides security against various attacks.

Operates effectively in both low and high data regimes.

Abstract

Quantum metrology and quantum communications are typically considered as distinct applications in the broader portfolio of quantum technologies. However, there are cases where we might want to combine the two and recent proposals have shown how this might be achieved in entanglement-based systems. Here we present an entanglement-free alternative that has advantages in terms of simplicity and practicality, requiring only individual qubits to be transmitted. We demonstrate the performance of the scheme in both the low and high data limits, showing quantum advantages both in terms of measurement precision and security against a range of possible attacks.