Quantum mechanics states that the measurement process can fundamentally alter what is being measured. This 'back-action' has been observed on the macroscopic scale — in the vibrations of a tiny mechanical device.
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Roukes, M. Observing and the observed. Nature 443, 154–155 (2006). https://doi.org/10.1038/443154a
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DOI: https://doi.org/10.1038/443154a
