For 60 years, physicists thought they knew exactly how coherent a laser could get. Now the ultimate quantum limit to laser coherence has been found, and it's much much bigger than anybody thought.
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Articles on Quantum theory
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We identify an experimental method which could finally reveal whether objects much larger than atoms - such as humans or animals - can exist in several places at once.
If it's impossible to accurately predict the future then there may be limits to how smart artificial intelligence can become.
