A Momentary Flow

Updating Worldviews one World at a time

Pioneering experiments have cast doubt on a founding idea of the branch of physics called quantum mechanics. The Heisenberg uncertainty principle is in part an embodiment of the idea that in the quantum world, the mere act of observing an event changes it. But the idea had never been put to the test, and a team writing in Physical Review Letters says “weak measurements” prove the rule was never quite right. That could play havoc with “uncrackable codes” of quantum cryptography. Quantum mechanics has since its very inception raised a great many philosophical and metaphysical debates about the nature of nature itself. Heisenberg’s uncertainty principle, as it came to be known later, started as an assertion that when trying to measure one aspect of a particle precisely, say its position, experimenters would necessarily “blur out” the precision in its speed. That raised the spectre of a physical world whose nature was, beyond some fundamental level, unknowable. (via BBC News - Quantum test pricks uncertainty)

Pioneering experiments have cast doubt on a founding idea of the branch of physics called quantum mechanics. The Heisenberg uncertainty principle is in part an embodiment of the idea that in the quantum world, the mere act of observing an event changes it. But the idea had never been put to the test, and a team writing in Physical Review Letters says “weak measurements” prove the rule was never quite right. That could play havoc with “uncrackable codes” of quantum cryptography. Quantum mechanics has since its very inception raised a great many philosophical and metaphysical debates about the nature of nature itself. Heisenberg’s uncertainty principle, as it came to be known later, started as an assertion that when trying to measure one aspect of a particle precisely, say its position, experimenters would necessarily “blur out” the precision in its speed. That raised the spectre of a physical world whose nature was, beyond some fundamental level, unknowable. (via BBC News - Quantum test pricks uncertainty)

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