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Science 11 February 2005:
Vol. 307. no. 5711, pp. 872 - 875
DOI: 10.1126/science.1109545
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From Pedigree Cats to Fluffy-Bunnies

Jacob Dunningham, Alexander Rau, Keith Burnett*

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.

Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, UK.

* To whom correspondence should be addressed. E-mail: k.burnett1{at}physics.ox.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)