I think the obvious thing to do with one computer per planet is fix climate change before it destroys agriculture and leaves billions of people to starve. That seems like a fairly reasonable kind of an objective. You know, there are all kinds of little optimizations you could do with these things, but fundamentally the big unsolved challenges that humanity faces are climate change and resource scarcity.
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From vast data centers to mobile phones, the power of computers continues to transform our lives. But there are some problems across artificial intelligence, in the design of new materials, pharmaceuticals, and clean energy devices that they will simply never solve. So even if we turned our entire planet into a giant supercomputer we wouldn’t be able to solve these and many other important problems. The good news is that if we could build a computing device based on fundamental quantum principles, we could.