"All physical systems can be thought of as registering and processing information, and how one wishes to define computation will determine your view of what computation consists of."
"[With quantum computers] you can calculate how many bits are in the universe, how much energy it takes to flip them, how much energy exists, and use that to rule out lots of things about the universe's history. Anything that takes more bit flips couldn't have happened."
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Source: Seth Lloyd on Quantum Computing by Scott Dewing, blog.insidethebox.org, September 23, 2011.
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