Correction to: Nature Communications https://doi.org/10.1038/s41467-020-16013-1, published online 29 May 2020.

The original version of this Article contained an error in the fifth sentence of the abstract, which was previously incorrectly given as ‘This relativity ia a signature of an indefinite metric, where events can occur in an indefinite causal order’. The correct version states ‘This relativity is a signature of an indefinite metric, where events can occur in an indefinite causal order’. This has been corrected in both the PDF and HTML versions of the Article.