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arXiv:quant-ph/0203057 · Nature

Plasmon-assisted transmission of entangled photons

E. Altewischer, Martin P. van Exter, J. P. Woerdman

Published Jul 1, 2002• 514 citations
arXivHTMLPDF
DOI
10.1038/nature00869

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We report on experimental evidence of the preservation of the energy-time entanglement of a pair of photons after a photon-plasmon-photon conversion. This preservation is observed in two different plasmon conversion experiments, namely, extraordinary optical transmission through subwavelength metallic hole arrays and long range surface plasmon propagation in metallic waveguides. Plasmons are shown to coherently exist at two different times separated by much more than their lifetimes. This kind of entanglement involving light and matter is expected to be useful for future processing and storing of quantum information.