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Phys. Rev. Lett. 106, 130506 (2011) [4 pages]

14-Qubit Entanglement: Creation and Coherence

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Thomas Monz1, Philipp Schindler1, Julio T. Barreiro1, Michael Chwalla1, Daniel Nigg1, William A. Coish2,3, Maximilian Harlander1, Wolfgang Hänsel4, Markus Hennrich1,*, and Rainer Blatt1,4
1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
2Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
3Department of Physics, McGill University, Montreal, Quebec, Canada H3A 2T8
4Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck, Austria

Received 30 September 2010; published 31 March 2011

We report the creation of Greenberger-Horne-Zeilinger states with up to 14 qubits. By investigating the coherence of up to 8 ions over time, we observe a decay proportional to the square of the number of qubits. The observed decay agrees with a theoretical model which assumes a system affected by correlated, Gaussian phase noise. This model holds for the majority of current experimental systems developed towards quantum computation and quantum metrology.

© 2011 American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.106.130506
DOI:
10.1103/PhysRevLett.106.130506
PACS:
03.67.Mn, 03.65.Ud, 32.80.Qk, 37.10.Ty

*Markus.Hennrich@uibk.ac.at

 
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