Symmetric bidirectional quantum teleportation using a six-qubit cluster state as a quantum channel

Bidirectional quantum teleportation is a fundamental protocol for exchanging quantum information between two quantum nodes. Till now, all bidirectional quantum teleportation protocols have achieved a maximum efficiency of 40%. Here, we propose a new scheme for a symmetric bidirectional quantum teleportation using a six-qubit cluster state as the quantum channel, for symmetric (3 ? 3) qubit bidirectional quantum teleportation of a special three-qubit entangled state. The novelty of our scheme lies in its generalisation for (N ? N) qubit bidirectional quantum teleportation employing a 2N-qubit cluster state. The efficiency of the proposed protocol is remarkably increased to 50% which is the 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.

Automated summary

In this article, a new scheme for symmetric bidirectional quantum teleportation is proposed using a six-qubit cluster state as the quantum channel. The efficiency of the proposed protocol is remarkably increased to 50%, which is the highest achieved so far. Interestingly, only GHZ-state measurements and four Toffoli-gate operations are necessary, independent of the number of qubits to be teleported.