I know what it feels like to listen to domain experts with experience far beyond my comprehension, and I can recognize I don't have the baseline to understand what they're discussing. I can nevertheless accept their expertise.

But I have yet to hear any explanation of quantum computing where I feel the experts know what they're talking about.

The one who is sheparding the explanations along the graduations is mattering. If she understands what's going on she has no capacity to explain it.

In the last segment, at the highest level of this presentation, the old expert admits he doesn't understand it.

The routinely repeated explanation is that QC can factor in a way that destroys cryptography, and if this is possible, it's easy to understand why it's being sought.

But year after year, decade after decade, it's always in the future subject to vague criteria.

If someone here can explain QC in 800 words or less, at the level of a thesis like:

"a computer is a device that converts data into information under the control of an algorithm"

please make a presentation and illuminate the world with your insights.

This presentation, like every other presentation I've ever seen, fails at this basic imperative.

And if other presentations have succeeded, why is yet another presentation necessary?