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.

Received 30 September 2010

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

Authors & Affiliations

Thomas Monz¹, Philipp Schindler¹, Julio T. Barreiro¹, Michael Chwalla¹, Daniel Nigg¹, William A. Coish^2,3, Maximilian Harlander¹, Wolfgang Hänsel⁴, Markus Hennrich^1,*, and Rainer Blatt^1,4

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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Issue

Vol. 106, Iss. 13 — 1 April 2011

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