14-Qubit entanglement: creation and coherence |
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Authors: | Monz Thomas Schindler Philipp Barreiro Julio T Chwalla Michael Nigg Daniel Coish William A Harlander Maximilian Hänsel Wolfgang Hennrich Markus Blatt Rainer |
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Institution: | Institut für Experimentalphysik, Universit?t Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria. |
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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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