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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