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  Experimental entanglement distribution by separable states

Vollmer, C. E., Schulze, D., Eberle, T., Händchen, V., Fiurasek, J., & Schnabel, R. (2013). Experimental entanglement distribution by separable states. Physical Review Letters, 111: 230505. doi:10.1103/PhysRevLett.111.230505.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1176-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1177-D
Genre: Journal Article

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 Creators:
Vollmer, Christina E., Author
Schulze, Daniela, Author
Eberle, Tobias1, Author              
Händchen, Vitus1, Author              
Fiurasek, Jaromir, Author
Schnabel, Roman1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Quantum Physics, quant-ph
 Abstract: The distribution of entanglement between macroscopically separated parties represents a crucial protocol for future quantum information networks. Surprisingly, it has been theoretically shown that two distant systems can be entangled by sending a third mediating system that is not entangled with either of them. Such a possibility seems to contradict the intuition that to distribute entanglement, the transmitted system always needs to be entangled with the sender. Here, we experimentally distribute entanglement by exchanging a subsystem and successfully prove that this subsystem is not entangled with either of the two parties. Our implementation relies on the preparation of a specific three-mode Gaussian state containing thermal noise that demolishes the entanglement in two of the three bipartite splittings. After transmission of a separable mode this noise can be removed by quantum interference. Our work demonstrates an unexpected variant of entanglement distribution and improves the understanding necessary to engineer multipartite quantum information networks.

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 Dates: 2013-03-052013-03-072013
 Publication Status: Published in print
 Pages: 9 pages, 6 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1303.1082
DOI: 10.1103/PhysRevLett.111.230505
URI: http://arxiv.org/abs/1303.1082
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 111 Sequence Number: 230505 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1