14-Qubit entanglement: creation and coherence.

  title={14-Qubit entanglement: creation and coherence.},
  author={Thomas Monz and Philipp Schindler and Julio T. Barreiro and Michael Chwalla and Daniel Nigg and William A. Coish and Maximilian Harlander and Wolfgang H{\"a}nsel and Markus Hennrich and Rainer Blatt},
  journal={Physical review letters},
  volume={106 13},
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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  • R. Rosenfeld
  • Medicine
    Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery
  • 2009
  • Roy. Soc. Lond. A 452, 567
  • 1996
A 34
  • 6837
  • 2001
New J
  • Phys. 12, 053002
  • 2010
Proc. R. Soc. A
  • Proc. R. Soc. A
  • 2009
  • J. 78, 707
  • 2000
Nature Phys
  • Nature Phys
  • 2010
Science 306
  • 1330
  • 2004
Nature Phys
  • Nature Phys
  • 2008
Biophys. J
  • Biophys. J
  • 2000