Non-ideal teleportation of tripartite entanglement: Einstein-Podolsky-Rosen versus Greenberger-Horne-Zeilinger schemes

TL;DR

This paper compares the effectiveness of GHZ and EPR channels for teleporting tripartite entangled states, demonstrating that GHZ channels can outperform EPR channels under realistic noise and error conditions.

Contribution

It introduces a teleportation protocol using GHZ states for tripartite entanglement and shows its superior fidelity over EPR channels in noisy environments.

Findings

GHZ channels enable teleportation of certain three-qubit states.

GHZ-based teleportation has higher fidelity under noise.

Most scenarios require distinguishing four GHZ basis elements.

Abstract

Channels composed by Einstein-Podolsky-Rosen (EPR) pairs are capable of teleporting arbitrary multipartite states. The question arises whether EPR channels are also optimal against imperfections. In particular, the teleportation of Greenberger-Horne-Zeilinger states (GHZ) requires three EPR states as the channel and full measurements in the Bell basis. We show that, by using two GHZ states as the channel, it is possible to transport any unknown three-qubit state of the form $c_0|000\rangle+c_1|111\rangle$. The teleportation is made through measurements in the GHZ basis, and, to obtain deterministic results, in most of the investigated scenarios, four out of the eight elements of the basis need to be unambiguously distinguished. Most importantly, we show that when both, systematic errors and noise are considered, the fidelity of the teleportation protocol is higher when a GHZ channel is used in comparison to that of a channel composed by EPR pairs.