Multipartite entangled magnon states as quantum communication channels

TL;DR

This paper investigates conditions for highly entangled magnon states in quantum dots to serve as effective quantum communication channels, enabling deterministic teleportation and maximal classical information encoding.

Contribution

It identifies specific conditions for magnon states to be highly entangled and useful in quantum communication protocols, including teleportation and information capacity maximization.

Findings

Magnon states can be highly entangled under certain conditions.

These states enable deterministic teleportation of two-qubit systems.

Channel capacity can reach the Holevo bound for maximal information encoding.

Abstract

We explicate conditions under which, the two magnon state becomes highly entangled and is useful for several quantum communication protocols. This state, which is experimentally realizable in quantum dots using Heisenberg exchange interaction, is found to be suitable for carrying out deterministic teleportation of an arbitrary two qubit composite system. Further, conditions for which the channel capacity reaches "Holevo bound", allowing maximal amount of classical information to be encoded, are derived. Later, an explicit protocol for the splitting and sharing of a two qubit entangled state among two parties, using this state as an entangled resource, is demonstrated.