Your article on quantum physics, suggesting that entanglement rather than the uncertainty principle is the key to the quantum world, mangled facts about an excellent experiment to a tabloid press level ("An end to uncertainty", 6 March, p 24).
The Heisenberg uncertainty principle is a direct consequence of the fundamental axioms of quantum theory. As the experiment discussed in the article has precisely the result predicted by quantum theory, it must verify the uncertainty principle.
The uncertainty principle does not depend on "random kicks" in collisions but on the impossibility of systems simultaneously possessing complementary properties such as position and momentum. The statement by one of the experimenters that "Everyone believes that when an interference pattern is lost, it happens because of random kicks to the particles" is untrue.
No one who knows any quantum measurement theory has believed this for many a year. The "random kicks" story is ...
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