here are some of my observations & conclusions:
1. Quantum Computers require classical computer, to set starting conditions (state, electricity, data and program(-s) code, more or less) for computations.
2. Once prepared by 'classical computer', 'Quantum' part performs certain type of computations (calculations, perhaps with side effects) much faster than classical computers.
3. Perhaps a mere act of observing Quantum Computer's state (electricity in computer, data and program(-s) code, more or less) alters such a state, making it 'immune to hacking' in a way.
4. Hacking is something done not according with design, it's not only breaking computers or software parts, but also using them more efficiently.
5. If we hack a 'classical computer' part of a 'Quantum Computer', we can either disable it completely, or set conditions for running computations our way and executing order to do so. Understanding 'Quantum' part of a 'Quantum Computer' lets us do this efficiently.
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Most likely a 'classical computer' part will include extra security measures,
for example: custom Operating System, protective LAN around it, perhaps more.
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itsecinreal.blogspot.com/2014/…