Practical multipartite entanglement distribution in noisy channels

Entanglement among multiple parties is vital for practical quantum information applications. As two kinds of typical multipartite entangled state, the W and Greenberger-Horne-Zeilinger (GHZ) states have attracted a lot of attention. In this paper, we propose two practical linear optical schemes for multipartite entanglement distribution in noisy channels. Using the time-bin or spatial-mode degree of freedom (DoF) encoding, the influence of the noise will be eliminated and perfect W or GHZ state can be achieved among different nodes in a deterministic way. Moreover, we construct quantum circuits, which can be implemented with current technology. These results contribute to long-distance quantum communication both in theoretical and experimental points of view.

Automated summary

In this paper, two practical linear optical schemes are proposed for the distribution of multipartite entanglement in noisy channels. By using specific encoding methods, perfect W or GHZ states can be achieved among different nodes in a deterministic manner. These results are of great significance for long-distance quantum communication both in theory and experiment.