Special Viewpoints

From Pedigree Cats to Fluffy-Bunnies

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Science  11 Feb 2005:
Vol. 307, Issue 5711, pp. 872-875
DOI: 10.1126/science.1109545

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We consider two distinct classes of quantum mechanical entanglement. The first “pedigree” class consists of delicate highly entangled states, which hold great potential for use in future quantum technologies. By focusing on Schrödinger cat states, we demonstrate not only the possibilities these states hold but also the difficulties they present. The second “fluffy-bunny” class is made up of robust states that arise naturally as a result of measurements and interactions between particles. This class of entanglement may be responsible for the classical-like world we see around us.

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