I can't say that I'm very well familiar with quantum computing or the science behind it, but as far as I know, quantum computing is only applicable to a rather narrow spectrum of tasks. Well, it seems that breaking encrypting algos falls right into its scope of problem solving,
solving binary problems such as SHA, d-wave is not that great at.
quantum is better at non binary things.
for instance. instead of just binary(2 option): on off, yes no, stay go, true false
quantum can do DNA..
0 A
1 C
2 G
4 T
and can map DNA better and recalculate it easily.
mapping
0 north
1 east
2 south
3 west
where as in binary it needs 2bits to do a single option like that
00 north
10 east
01 south
11 west
basically quantum 'bits' are only 2x efficient than binary bits when it comes to binary problems.
but quantum can be more efficient at other things non binary.