14-Qubit Entanglement: Creation and Coherence

Phys. Rev. Lett. 106, 130506 – Published 31 March 2011
Thomas Monz, Philipp Schindler, Julio T. Barreiro, Michael Chwalla, Daniel Nigg, William A. Coish, Maximilian Harlander, Wolfgang Hänsel, Markus Hennrich, and Rainer Blatt


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.

DOI: http://dx.doi.org/10.1103/PhysRevLett.106.130506

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  • Received 30 September 2010
  • Published 31 March 2011

© 2011 American Physical Society

Authors & Affiliations

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

  • *Markus.Hennrich@uibk.ac.at

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