The majestic successes of quantum physics have made it common to state that we live in a quantum world. This belief seems to suggest a kind of “quantum fundamentalism” according to which everything in the universe is key to a quantum world. Bohr’s interpretation of quantum mechanics has traditionally been seen as denied to such a view, not least because of his emphasis on the requirement of the theories of classical physics in the account of quantum aspects. Was Bohr correct? a consensus seems to be emerging that we just haven’t worked hard enough, and that we do live in a quantum world, and that we can propagate classical physics from purely quantum laws.
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