Quantum enhancement of spoofing detection with squeezed states of light

TL;DR

This paper demonstrates that quantum state discrimination can significantly improve spoofing detection in electromagnetic signals, achieving near-perfect detection with standard laser sources and squeezed states, surpassing classical limits.

Contribution

It establishes the ultimate quantum limit for spoofing detection and shows that this limit can be reached with coherent states, enabling practical implementations with existing laser technology.

Findings

Quantum enhancement persists regardless of photon number.

Optimal detection bound achieved with coherent states.

Near-100% detection probability with squeezed states under certain conditions.

Abstract

We employ quantum state discrimination theory to establish the ultimate limit for spoofing detection in electromagnetic signals encoded with random quantum states. Our analysis yields an analytical expression for the optimal bound, which we prove can be achieved using a pair of coherent states. Notably, the quantum enhancement persists regardless of photon number, thereby removing the previous constraint to single-photon sources. This breakthrough unlocks new experimental possibilities using standard laser sources. Furthermore, we explore the encoding of squeezed states and demonstrate that the detection probability approaches 100% when the spoofer's capability is restricted to coherent state generation.