PerspectiveQuantum Systems

Macroscale entanglement and measurement

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Science  07 May 2021:
Vol. 372, Issue 6542, pp. 570-571
DOI: 10.1126/science.abh3419

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Summary

Quantum mechanics governs both fundamental particles and large objects, but for the latter, a myriad of different factors conspire to mask its effects and render deviations from a purely classical description all but invisible. However, careful and controlled experiments can reveal purely quantum mechanical phenomena of large objects. On pages 622 and 625 of this issue, Kotler et al. (1) and Mercier de Lépinay et al. (2), respectively, report experimental examples of the direct observation of two effects of quantum mechanics in macroscopic objects that cannot be seen classically. Kotler et al. report direct evidence of quantum entanglement of macroscopic objects (vibrating drumhead membranes), and Mercier de Lépinay et al. detect and even evade back-action in quantum-mechanical measurements of an analogous system.

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