Non-classicality thresholds for multiqubit states - numerical analysis

TL;DR

This paper introduces a numerical method to identify non-classical multiqubit states that violate Bell's inequalities, aiding quantum information tasks without needing explicit inequalities.

Contribution

It develops a numerical approach to detect non-classicality in multiqubit states, bypassing the need for explicit Bell inequality formulations.

Findings

Numerical results reveal non-classical states efficiently.

Method applies to various multiqubit families.

Supports quantum protocols like cryptography and secret sharing.

Abstract

States that strongly violate Bell's inequalities are required in many quantum informational protocols as, for example, in cryptography, secret sharing and the reduction of communication complexity. We investigate families of such states with a numerical method which allows to reveal non-classicality even without direct knowledge of Bell's inequalities for the given problem. An extensive set of numerical results is presented and discussed.