"In spite of everything, I still believe that people are really good at heart." -Anne Frank
“We are what we think. All that we are arises with our thoughts. With our thoughts, we make the world.” -Buddha
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The things I said about QC were theoretical but rigorously-derived conclusions. Of course, you're right in that actual implementations of QC have been so small scale that all that has been done is adding two numbers together.
Also, we were in the micron range for transistors decades ago; that's why it's called "micortechnology," after all. We're around the 60 nm node now.
EDIT: I double-checked this, and it looks like the state-of-the-art that is currently in the consumer market is 45 nm transistors. 65 nm was state-of-the-art all the way back in 2007. Technology is shrinking quickly...
Also, I should clarify by saying that the size node refers to the half-pitch of the transistor array. That is, the center-to-center spacing of the transistors is twice the node size. The transistor width is around half the center-to-center spacing.
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