Dear all. It is not unusual that doubts arise regarding the correctness of conclusions presented in a scientific article. According to scientific practice, such doubts lead to a careful investigation and a potential clarification of the extent. I have decided to inform you about one particular case, as this article has received great attention, also outside the department: During the past month it has become clear that the calculations in the article Sørensen, J., Pedersen, M., Munch, M. et al. Exploring the quantum speed limit with computer games. Nature 532, 210-213 (2016). https://doi.org/10.1038/nature17620, is subject to errors, which indicate that parts of the wording of the article and figures are wrong. It is for example incorrect that "players succeed where purely numerical optimization fails". The authors are currently identifying the extent of the consequences, they have informed Nature that mistakes have been found, and they are expected to hand in their account of the consequences to Nature within a few days. Best wishes, Ulrik Ulrik I. Uggerhøj Department of Physics and Astronomy Aarhus University Denmark Phone: +45 2338 2373