Correction to: npj Quantum Information 6, 40, https://doi.org/10.1038/s41534-020-0276-2, published online 15 May 2020

The original version of this Article omitted the following from the Acknowledgements: “This work has also been funded by the National Science Centre, Poland under QuantERA program, Grant No. 2017/25/Z/ST3/03044.”

This has now been corrected in both the PDF and HTML versions of the Article.