Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.12: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Entanglement distribution by separable states and quantum discord — •Daniela Schulze1, Christina E. Vollmer1, Tobias Eberle1, Vitus Händchen1, Jaromír Fiurášek2, and Roman Schnabel1 — 1Albert-Einstein Institut, Institut für Gravitationsphysik, Leibniz Universität Hannover, Callinstr. 38, 30167 Hannover, Germany — 2Department of Optics, Palacký University, 17. listopadu 50, 77200 Olomouc, Czech Republic
Distribution of entanglement between two parties - Alice and Bob - is an essential step for most quantum information protocols. Surprisingly, it has been theoretically shown [1,2] that two distant systems can be entangled by sending a third system that is not entangled with either of them. We report on the experimental realization of a scheme for entanglement distribution by separable states on the basis of continuous variables [3]. We show that, as expected, our successful protocol requires a non-zero quantum discord.
[1] T. S. Cubitt, F. Verstraete, W. Dür, J. I. Cirac, Phys. Rev. Lett. 91, 037902 (2003).
[2] L. Mǐsta, N. Korolkova, Phys. Rev. A 77, 050302 (2008).
[3] C. E. Vollmer, D. Schulze, T. Eberle, V. Händchen, J. Fiurášek, R. Schnabel, Phys. Rev. Lett. 111, 230505 (2013).