Element Six and Delft University of Technology announced the entanglement of electron spin qubits in two synthetic diamonds separated in space. This breakthrough is a major step toward achieving a diamond-based quantum network
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Bernien, H., Hensen, B., Pfaff, W., Koolstra, G., Blok, M.S., Robledo, L., Taminiau, T.H., Markham, M., Twitchen, D.J., Childress, L. & Hanson, R. 2013 Heralded entanglement between solid-state qubits separated by three meters. Nature 497: 86 - 90. DOI: 10.1038/nature12016