Symmetric Bidirectional Quantum Teleportation using a Six-Qubit Cluster State as a Quantum Channel

TL;DR

This paper introduces a symmetric bidirectional quantum teleportation protocol using a six-qubit cluster state, achieving a record 50% efficiency and scalable to N qubits with minimal operations.

Contribution

It presents a novel, scalable scheme for symmetric bidirectional quantum teleportation with higher efficiency and simple measurement and gate requirements.

Findings

Achieves 50% efficiency, the highest reported so far.

Generalizes to N-qubit bidirectional teleportation with minimal operations.

Uses only GHZ measurements and Toffoli gates regardless of N.

Abstract

Bidirectional quantum teleportation is a fundamental protocol for exchanging quantum information between two quantum nodes. All bidirectional quantum teleportation protocols till now have achieved a maximum efficiency of $40\%$. Here, we propose a new scheme for symmetric bidirectional quantum teleportation using a six-qubit cluster state as the quantum channel, for symmetric ($3\leftrightarrow3$) qubit bidirectional quantum teleportation of a special three-qubit entangled state. The novelty of our scheme lies in its generalization for ($N\leftrightarrow N$) qubit bidirectional quantum teleportation employing a $2N$-qubit cluster state. The efficiency of the proposed protocol is remarkably increased to $50\%$ which is highest till now. Interestingly, only GHZ-state measurements and four Toffoli-gate operations are necessary which is independent of the number $(N)$ of qubits to be teleported.