Nature 453, 1008-1015 (19 June 2008) | doi:10.1038/nature07125; Published online 18 June 2008

Entangled states of trapped atomic ions

Rainer Blatt1,2 & David Wineland3


To process information using quantum-mechanical principles, the states of individual particles need to be entangled and manipulated. One way to do this is to use trapped, laser-cooled atomic ions. Attaining a general-purpose quantum computer is, however, a distant goal, but recent experiments show that just a few entangled trapped ions can be used to improve the precision of measurements. If the entanglement in such systems can be scaled up to larger numbers of ions, simulations that are intractable on a classical computer might become possible.

  1. Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
  2. Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck, Austria.
  3. National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.


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