Distributing entanglement with separable states.
We experimentally demonstrate a protocol for entanglement distribution by a separable quantum system. In our experiment, two spatially separated modes of an electromagnetic field get entangled by local operations, classical communication, and transmission of a correlated but separable mode between them. This highlights the utility of quantum correlations beyond entanglement for the establishment of a fundamental quantum information resource and verifies that its distribution by a dual classical and separable quantum communication is possible.
Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Building 24, Erlangen, Germany and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstraße 7/B2, Erlangen, Germany.
Christian
C
Peuntinger
Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Building 24, Erlangen, Germany and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstraße 7/B2, Erlangen, Germany.
Vanessa
V
Chille
Department of Optics, Palacký University, 17. listopadu 12, 771 46 Olomouc, Czech Republic.
Ladislav
L
Mišta
School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS Scotland, United Kingdom.
Natalia
N
Korolkova
Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Building 24, Erlangen, Germany and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstraße 7/B2, Erlangen, Germany.
Michael
M
Förtsch
Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Building 24, Erlangen, Germany and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstraße 7/B2, Erlangen, Germany.
Jan
J
Korger
Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Building 24, Erlangen, Germany and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstraße 7/B2, Erlangen, Germany.
Christoph
C
Marquardt
Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Building 24, Erlangen, Germany and Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Staudtstraße 7/B2, Erlangen, Germany.
Gerd
G
Leuchs