Configurable controlled teleportation using multipartite GHZ states

TL;DR

This paper introduces a flexible controlled quantum teleportation protocol utilizing multipartite GHZ states, enhancing security and efficiency for multi-party quantum communication.

Contribution

It presents a novel protocol that reduces resource requirements and improves security features for controlled teleportation of multi-qubit states.

Findings

Protocol achieves high teleportation fidelity for various parameters.

Uses GHZ states to ensure security and anonymity.

Reduces resource qubits needed compared to previous methods.

Abstract

We propose a controlled quantum teleportation protocol for securely transferring an unknown $n$-qubit state from a sender to a receiver, under the supervision of $m$ controller participants. The protocol uses $n$ copies of an $m$-qubit Greenberger-Horne-Zeilinger state as the quantum resource. Message qubits can be distributed among participants to enhance security against targeted external attacks. Each intermediate party may hold at most one resource qubit, reducing the total number of resource qubits required. The sender selects the end receiver during protocol execution, ensuring anonymity and minimizing the risk of interception by an external eavesdropper. We assess the protocol's performance by calculating teleportation fidelities for various $m$ and $n$ values and visualize the quantum states through Hinton diagrams. The results confirm the protocol's effectiveness for secure quantum communication in multi-party settings.