Cracking the invisible cloak by using the temporal steering inequality

TL;DR

This paper introduces a quantum method using the temporal steering inequality to detect invisible cloaks that hide objects by guiding waves without distortion, focusing on quantum degrees of freedom.

Contribution

It presents a novel quantum detection technique for invisible cloaks based on temporal steering inequality, addressing overlooked quantum degrees of freedom.

Findings

Temporal steering inequality can detect invisible cloaks.

Quantum degrees of freedom reveal cloaking effects.

New method enhances cloaking detection capabilities.

Abstract

Invisible cloaks provide a way to hide an object under the detection of waves. A perfect cloak guides the incident waves through the cloaking shell without any distortion. In most cases, some important quantum degrees of freedom, e.g. electron spin or photon polarization, are not taken into account when designing a cloak. Here, we propose to use the temporal steering inequality of these degrees of freedom to detect the existence of an invisible cloak.