Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum information: Photons and nonclassical light II
Q 68.7: Vortrag
Freitag, 22. März 2013, 15:30–15:45, F 142
Entanglement distribution by separable states — •Daniela Schulze1, Christina E. Vollmer1, Tobias Eberle1, Vitus Händchen1, Jaromír Fiurášek2, and Roman Schnabel1 — 1Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), 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. Usually, entanglement is distributed directly by exchanging entangled subsystems between the individual parties. However, it has been shown in [1] that it is possible to establish entanglement between two parties by exchanging an ancilla mode C, which is neither entangled with Alice’s mode A, nor with Bob’s mode B. We report on the experimental realization of a scheme for entanglement distribution by separable states on the basis of continuous variables. Our scheme relies on a specific three-mode Gaussian state where parts of the entanglement structure are initially hidden by correlated noise and later restored via quantum interference.
[1] T. Cubitt, F. Verstraete, W. Dür, and J. Cirac. Separable States Can Be Used To Distribute Entanglement. Physical Review Letters, 91(3):1-4, July 2003.