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Multipartite state generation in quantum networks with optimal scaling.

J Wallnöfer1, A Pirker2, M Zwerger2

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We present a novel repeater scheme for efficient multipartite entanglement distribution in quantum networks. This approach offers optimal scaling and constant overhead, outperforming other methods in specific scenarios.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Networks
  • Entanglement Distribution

Background:

  • Quantum networks require efficient distribution of multipartite entangled states.
  • Existing repeater schemes face challenges with scaling and overhead for multipartite entanglement.
  • Generating large-scale entangled states like cluster and GHZ states over long distances is crucial.

Purpose of the Study:

  • To introduce a novel repeater scheme for efficient multipartite entanglement distribution.
  • To achieve optimal scaling and constant overhead in quantum networks.
  • To enable the generation of large-scale graph states (e.g., cluster, GHZ) over arbitrary distances.

Main Methods:

  • Measurement-based implementation of multipartite hashing for entanglement purification.
  • Local merging and connection of elementary building blocks.
  • Analysis of scheme performance under limited local or global storage conditions.

Main Results:

  • The proposed scheme efficiently distributes multipartite entangled states with optimal scaling.
  • It achieves a constant overhead per node/channel, independent of distance.
  • The multipartite approach demonstrates a storage advantage, leading to higher efficiency compared to bipartite and hybrid methods in certain regimes.

Conclusions:

  • The novel repeater scheme provides an efficient and scalable solution for multipartite entanglement distribution.
  • It enables the generation of complex graph states over arbitrary distances with practical overhead.
  • The approach is versatile, applicable to various network topologies and target states.