14-Qubit Entanglement: Creation and Coherence

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

Abstract

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.

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  • Received 30 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.130506

© 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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Vol. 106, Iss. 13 — 1 April 2011

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This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

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