PerspectiveQuantum Mechanics

Schrödinger's Cat Is Out of the Hat

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Science  27 Oct 2000:
Vol. 290, Issue 5492, pp. 720-721
DOI: 10.1126/science.290.5492.720

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In 1935, Erwin Schrödinger suggested his famous gedanken experiment of the cat that is simultaneously "dead" and "alive" inside its box until the box is opened. But as Tesche explains in her Perspective, such a macroscopic manifestation of quantum mechanics has remained elusive until recently. The experiments by van der Wal et al. are an important step toward demonstrating that quantum mechanics can describe macroscopic phenomena. The approach may be exploited in quantum computing and quantum cryptography.