What role does quantum computing have in defence, any, or none?

The huge advances in supercomputing over the last few years have benefitted a number of industrial, financial and scientific communities, but there has not been a great deal of media about them being used in defence and security applications.

Cryptography, aerodynamics, social media connection analysis and other large data set correlation are, of course, the most obvious answers, but are there any others, others that involve really hard sums!

Watch this video from D-Wave Systems whilst you are thinking about it.