If what is so-called ”Quantum Computing” is going to be realized… with such “massive” computing power I think the entire world will be changed dramatically!!.. As you might know, “Quantum Computing” is just a theory now, but who knows.. it could be realized some day, especially with those huge efforts and projects done in numerous countries to make it real!!… BTW, most of the “Quantum Computing” theorists strongly predict that it’s gonna be realized in 50 years from now!!
The thing that I’ve just known.. is that the computers based on “Quantum Computing” will work even if they’re shutt-off!!
Does that mean: in future our computers wont be fully safe from logical attacks (e.g. password cracking) even when they are off?!!
I think “Gene Spafford” the information security professor who stated the famous quote: “The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn’t stake my life on it” is happily smiling right now!! 
You can find more interesting facts in this article: Press Here
BTW, there is a derived notion from “Quantum Computing” called “Quantum Cryptography”… which is a methodology to construct a cryptographic system based on the physical characteristics of the light beams.. “Quantum Cryptography” has been already realized!! and It will become a “must-use” when “Quantum Computing” is born; because with ”Quantum Computing” in the world, we’ll kiss the “ordinary cryptographic systems” goodbye!!
For more information about “Quantum Cryptography”.. I’d recommend this pdf file: Press Here
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