Correction to: npj Quantum Information https://doi.org/10.1038/s41534-019-0150-2, published online 02 May 2019

In the acknowledgments, there was an incomplete project number for the Austrian Science Fund. The original text was “from the Austrian Science Fund (FWF) through CoQuS (W1210-4), NaMuG (P30067-N36) and BeyondC (F71)”. This has now been corrected to “from the Austrian Science Fund (FWF) through CoQuS (W 1210-N25), NaMuG (P 30067-N36) and BeyondC (F 7113-N38)” in the HTML and PDF.