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.

Department of Optics Palacký University 17 listopadu 12 771 46 Olomouc Czech Republic

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

School of Physics and Astronomy University of St Andrews North Haugh St Andrews Fife KY16 9SS Scotland United Kingdom

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Experimental demonstration of a fully inseparable quantum state with nonlocalizable entanglement