On 10/6/2021 4:58 AM, John Clark wrote:
The difficulty in maintaining quantum coherence is the only reason we don't have practical quantum computers today,
Well there is also the fact that there are only about two dozen problems for which there is a known quantum algorithm faster than the best classical algorithm...and even there "faster" means in the limit of large problem size, not necessarily in realistic problem sizes. And of those two dozen problems all but a handful are contrived specifically to show that there exist problems for which a QC is necessarily faster (in the large problem limit).
And when you talk about practical computers, how much more would it be worth to you if the word processor on your laptop was a thousand times faster or your computer game refreshed ten times faster. The "practical" applications were initially supposed to be in encryption, both breaking and making unbreakable. But now all the financial institutions are switching from RSA to encryption for which there's no QC algorithm to break it.
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