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Nature 438, 639-642 (1 December 2005) | doi:10.1038/nature04251;

Open Innovation Challenges

Creation of a six-atom |[lsquo]|Schr|[ouml]|dinger cat|[rsquo]| state

Among the classes of highly entangled states of multiple quantum systems, the so-called |[lsquo]|Schr|[ouml]|dinger cat|[rsquo]| states are particularly useful. Cat states are equal superpositions of two maximally different quantum states.

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