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The negatively-charged nitrogen-vacancy colour centre in diamond has long been identified as a platform for quantum computation. However, despite beautiful proof of concept experiments, a pathway to true scalability has proven elusive. Now a group from Oxford and Grenoble-Alpes have shown coupling between nitrogen-vacancy centres and open Fabry-Perot cavities in a way that proves a clear route to scalable quantum computing (Johnson et al 2015 New J. Phys. http://dx.doi.org/10.1088/1367-2630/17/12/122003 17 http://dx.doi.org/10.1088/1367-2630/17/12/122003 ). And all at the relatively balmy temperature of 77 K.