During the Second World War Turing worked at Bletchley Park, Britain's code-breaking centre, and was for a time head of Hut 8, the section responsible for German naval cryptanalysis.
Computers that process qubits, which weirdly manage to be both 0 and 1 at the same time, are far faster at solving some problems-such as factoring large Numbers into primes, a step in code-breaking.