14-Qubit entanglement: creation and coherence.

@article{Monz201114QubitEC,
  title={14-Qubit entanglement: creation and coherence.},
  author={T. Monz and P. Schindler and J. Barreiro and M. Chwalla and D. Nigg and W. A. Coish and M. Harlander and W. H{\"a}nsel and M. Hennrich and R. Blatt},
  journal={Physical review letters},
  year={2011},
  volume={106 13},
  pages={
          130506
        }
}
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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