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Science 4 June 2004:
Vol. 304. no. 5676, pp. 1478 - 1480
DOI: 10.1126/science.1097522
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Reports

Control and Measurement of Three-Qubit Entangled States

Christian F. Roos,1 Mark Riebe,1 Hartmut Häffner,1 Wolfgang Hänsel,1 Jan Benhelm,1 Gavin P. T. Lancaster,1 Christoph Becher,1 Ferdinand Schmidt-Kaler,1* Rainer Blatt1,2

We report the deterministic creation of maximally entangled three-qubit states—specifically the Greenberger-Horne-Zeilinger (GHZ) state and the W state—with a trapped-ion quantum computer. We read out one of the qubits selectively and show how GHZ and W states are affected by this local measurement. Additionally, we demonstrate conditional operations controlled by the results from reading out one qubit. Tripartite entanglement is deterministically transformed into bipartite entanglement by local operations only. These operations are the measurement of one qubit of a GHZ state in a rotated basis and, conditioned on this measurement result, the application of single-qubit rotations.

1 Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria.
2 Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstraße 25, A-6020 Innsbruck, Austria.

* To whom correspondence should be addressed. E-mail: ferdinand.schmidt-kaler{at}uibk.ac.at

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Multipartite Entanglement Among Single Spins in Diamond.
P. Neumann, N. Mizuochi, F. Rempp, P. Hemmer, H. Watanabe, S. Yamasaki, V. Jacques, T. Gaebel, F. Jelezko, and J. Wrachtrup (2008)
Science 320, 1326-1329
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Science. ISSN 0036-8075 (print), 1095-9203 (online)