There is a bit of a major hurdle to leap over. That is decoherence. If you
write a simple program on the QE it runs in less than 10^{-6} seconds and
that is about all the time you have. The highly entangled quantum states
become mixed state entangled with the environment states and the execution
of the algorithm falls apart. Quantum error correction has its limits,
which is related to the limitations of using Hamming distance. So for now
quantum computers are in a bit of a niche market of sorts, and their
practical use is largely with encryption. I do though suspect before long
ordinary computers will have some qubit processor that will be executed in
some algorithms.
LC
On Thursday, June 20, 2019 at 6:19:47 AM UTC-5, John Clark wrote:
>
> In December 2018 researchers at Google solved a problem on their best
> quantum computer, but a low end laptop computer could solve it too. In
> January of this yearan improved quantum computer solved a more
> complicated version of the problem that took a high end desktop computer to
> equal. By February they had to use Google's huge server network of
> conventional computers to do what the Quantum Computer did.
>
> Granted the problem chosen in the above was picked not because it was
> useful but because it best highlighted what a Quantum Computer could do;
> nevertheless a counterpart of Moore's law for conventional computers has
> been proposed called Neven's Law named after the head of Google’s Quantum
> Artificial Intelligence lab Hartmut Neven.
>
> Neven's Law states that quantum computers are gaining computational power
> relative to conventional computers at a double exponential rate (2^(2)^2
> , 2^(2)^3 , 2^(2)^4 , 2^(2)^5 ...)
>
> If it turns out that Neven's law is anywhere close to being true then
> hold on to your buts because we're in for a bumpy ride.
>
> A New Law to Describe Quantum Computing’s Rise?
> <https://www.quantamagazine.org/does-nevens-law-describe-quantum-computings-rise-20190618/>
>
> John K Clark
>
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