Publisher's Note: “Loop-gap microwave resonator for hybrid quantum systems” [Appl. Phys. Lett. 112, 204102 (2018)]

This article was originally published online on 14 May 2018. Due to a production error, the initially-published version contained an obsolete version of Fig. 4, displaying a Q_ext value of 3000 instead of the correct 3500. AIP Publishing apologizes for this error. All online versions of the article were corrected on 18 May 2018, and it appears correctly in print.