Monogamy of entanglement as a necessary and sufficient condition for safe QKD in any physical theory

TL;DR

This paper demonstrates that monogamy of entanglement is both necessary and sufficient for ensuring the safety of quantum key distribution across all physical theories, by proposing a universal QKD protocol based on this principle.

Contribution

It introduces a universal QKD protocol that guarantees security solely based on the monogamy of entanglement, applicable to any physical theory.

Findings

Monogamy of entanglement guarantees QKD security in all physical theories.

A QKD protocol is presented that relies only on monogamous entanglement.

The necessity of monogamy for secure QKD is discussed.

Abstract

We show that the monogamy of entanglement is a sufficient phenomenon in every physical theory, if the quantum key distribution is to be safe on the grounds of such theory. To do so we present the QKD protocol that is safe in any physical theory under the assumption of the monogamous entanglement only. The necessity of this condition is also discussed.