The local content of all pure two-qubit states

TL;DR

This paper provides a complete solution to determining the local content of all pure two-qubit states, a measure of their non-locality, which has been an open problem for many years.

Contribution

It offers a comprehensive method to compute the local content of pure two-qubit states, resolving a long-standing open question in quantum non-locality.

Findings

Explicit formulas for local content of all pure two-qubit states

Resolution of a long-standing open problem in quantum non-locality

Enhanced understanding of the non-local properties of quantum states

Abstract

The (non-)local content in the sense of Elitzur, Popescu, and Rohrlich (EPR2) [Phys. Lett. A 162, 25 (1992)] is a natural measure for the (non-)locality of quantum states. Its computation is in general difficult, even in low dimensions, and is one of the few open questions about pure two-qubit states. We present a complete solution to this long-lasting problem.