03/12/2025
Quantum mechanics started out by saying access to fundamental reality was impossible.
And from the outset, some imagined that quantum mechanics would eventually eliminate the importance of human measurement in determining reality.
Yet a century on, the measurement problem still refuses to disappear, and the new generation of quantum technologies, from quantum computers to quantum sensors, only makes it harder to ignore.
As theory becomes engineering, Paul Davies argues that every attempt to “save” traditional views of realism fail, and that physics can no longer avoid confronting the role of observation in the structure of reality itself.
"Quantum mechanics does not uncover facts that were already there. Measurement brings reality into being," says Davies.
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Abandoning the dream of an observer-free physics
