On quantum cryptography with bipartite bound entangled states

TL;DR

This paper reviews recent developments in using bipartite bound entangled states for quantum cryptography, introducing a new construction of such states that contain secure correlations and have a nonzero distillable key.

Contribution

It presents a novel construction of low-dimensional bound entangled states with secure correlations and nonzero distillable key, advancing quantum cryptography applications.

Findings

Bound entangled states can be used for secure quantum cryptography.

New 6x6 bound entangled states with nonzero distillable key are constructed.

The paper reviews recent results on bound entanglement in quantum cryptography.

Abstract

Recently the explicit applicability of bound entanglement in quantum cryptography has been shown. In this paper some of recent results respecting this topic are reviewed. In particular relevant notions and definitions are reminded. The new construction of bound entangled states containing secure correlations is presented. It provides low dimensional 6\otimes6 bound entangled states with nonzero distillable key.