Splitting and recombining an electron wave packet has been used to test relativity at a record sensitivity. The result heralds an era of precision measurements of relativity using quantum-information methods. See Letter p.592
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Kostelecký, V. Relativity tested with a split electron. Nature 517, 559–560 (2015). https://doi.org/10.1038/517559a
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DOI: https://doi.org/10.1038/517559a
