Re: Why Google's Quantum Victory Is a Huge Deal—and a Letdown

jamesd at echeque.com jamesd at echeque.com
Sun Nov 3 14:36:49 PST 2019


On 2019-09-29 07:25, jim bell wrote:
> https://www.wired.com/story/why-googles-quantum-computing-victory-is-a-huge-deal-and-a-letdown/
> 
> 

Fifty four qbits is a a not quite seven qbyte computer.

Interesting applications become possible when you have two hundred and 
fifty six qbytes.

But fifty four qbits is one hell of a lot bigger than past quantum 
computers.  It is definitely a big step in the direction of a two 
hundred and fifty six qubyte computer.  The interesting question is how 
does this technology scale to reasonably sized quantum computers.

And the answer is, it does not.

To get a reasonable sized quantum computer you are going to need quantum 
error correction, with gigabyes of imperfect qbits representing a much 
smaller number of quantum error corrected qbits.  It is difficult wrap 
one's mind around the necessary design, which resists human intuition - 
hard to think about the scaling factors that come into play


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