Enhancing fidelity in teleportation of a two-qubit state via a quantum communication channel formed by spin-1/2 Ising-Heisenberg trimer chains due to a magnetic field

TL;DR

This paper explores how spin-1/2 Ising-Heisenberg trimer chains can serve as effective quantum channels for teleporting entangled two-qubit states, with magnetic fields enhancing teleportation fidelity.

Contribution

It introduces a novel quantum communication channel based on spin chains and demonstrates magnetic field-driven fidelity enhancement for teleportation.

Findings

Teleportation fidelity improves with moderate magnetic fields.

Quantum phase transition enhances entanglement support.

Polymeric trimer chains can be used experimentally up to 40 K and 80 T.

Abstract

We demonstrate that two independent spin-1/2 Ising-Heisenberg trimer chains provide an effective platform for the quantum teleportation of any entangled two-qubit state through the quantum communication channel formed by two Heisenberg dimers. The reliability of this quantum channel is assessed by comparing the concurrences, which quantify a strength of the bipartite entanglement of the initial input state and the readout output state. Additionally, we rigorously calculate quantities fidelity and average fidelity to evaluate the quality of the teleportation protocol depending on temperature and magnetic field. It is evidenced that the efficiency of quantum teleportation of arbitrary entangled two-qubit state through this quantum communication channel can be significantly enhanced by moderate magnetic fields. This enhancement can be attributed to the magnetic-field-driven transition from a quantum antiferromagnetic phase to a quantum ferrimagnetic phase, which supports realization of a fully entangled quantum channel suitable for efficient quantum teleportation. The polymeric trimer chains Cu3(P2O6OH)2 are proposed as an experimental resource of this quantum communication channel, which provides an efficient platform for realization of the quantum teleportation up to moderate temperatures 40 K and extremely high magnetic fields 80 T.