Distribution of entanglement between macroscopically separated parties is crucial for future quantum information networks. Surprisingly, it has been theoretically shown that two distant systems can be entangled by sending a third system that is not entangled with either of them. Here, we experimentally distribute entanglement and successfully prove that our transmitted light beam is indeed not entangled with the parties' local systems. Our work demonstrates an unexpected variant of entanglement distribution and improves the understanding necessary to engineer multipartite quantum networks.

Department of Optics Palacký University 17 listopadu 12 77146 Olomouc Czech Republic

Institut für Gravitationsphysik Leibniz Universität Hannover and Max Planck Institut für Gravitationsphysik Callinstrasse 38 30167 Hannover Germany

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Experimental demonstration of a fully inseparable quantum state with nonlocalizable entanglement