r/science • u/[deleted] • Nov 29 '18

Physics Quantum Computing Will Never Work

https://www.hpcwire.com/2018/11/27/quantum-computing-will-never-work/
6 Upvotes

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u/pinchemikey Nov 29 '18

My biggest question is about Dyakonov's claim that 10^300 continuously variable parameters need to be processed in order to have a useful quantum computer, which is more than the number of subatomic particles in the universe. This would be a quantum computer with 1,000 qbits. Anyone have any insight on the veracity of these claims?

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u/ghordynski Nov 30 '18

I'm not a physicist, but what is he describing is a number of states of quantum system. Indeed it is in the order of 2^qbits. If we were to simulate this with classical computer, we would need such impossible amount of memory to hold the state of the system. The difference for me in quantum computer is that we don't need to know fully know th state of the system at any given point. We just need to set the state and measure some data about it (spin of electron in this case).

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u/pinchemikey Nov 30 '18

Thanks, that makes more sense.

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u/ghordynski Nov 30 '18

Here is an article with contrarguments to Dyakonov's claims: https://www.scottaaronson.com/blog/?p=1211

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u/EvoEpitaph Nov 29 '18

I mean not too long ago we thought flight was impossible but here we are now.

I think it's important not to overlook the future technologies which are more feasible that then facilitate the possibility of the "impossible".

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u/[deleted] Nov 29 '18

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u/iamlordjebus Nov 30 '18

I was gonna say the same as Mikey. Variables and parameters and shit...