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Showing 1–11 of 11 results
Advanced filters: Author: H. Häffner Clear advanced filters

  • When 100 social and behavioural science claims were examined, 34% of reanalyses closely matched the original results, with 74% reaching the same conclusion, revealing limited robustness of single-path analyses and the need to address analytical uncertainty.

    • Balazs Aczel
    • Barnabas Szaszi
    • Brian A. Nosek
    Research
    Nature
    Volume: 652, P: 135-142

  • Robustness checks and reproduction of analyses with existing and updated data based on 110 articles in economics and political science journals with data and code-sharing requirements found high levels of robustness and reproducibility and determined that robustness was not dependent on author characteristics or data availability.

    • Abel Brodeur
    • Derek Mikola
    • Yaolang Zhong
    Research
    Nature
    Volume: 652, P: 151-156

  • An exhausting characterization of the coherence properties of quantum system becomes challenging with increasing system size. Here the authors demonstrate that phonon autocorrelation functions and quantum discord can be measured with local control, and validate it in a string of 42 trapped ions.

    • A. Abdelrahman
    • O. Khosravani
    • H. Häffner
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-5

  • In open quantum systems the correlations between the system and its environment play an important role. A trapped-ion experiment demonstrates that these correlations can be detected without accessing or knowing anything about the environment or its interactions.

    • M. Gessner
    • M. Ramm
    • H. Häffner
    Research
    Nature Physics
    Volume: 10, P: 105-109

  • Exotic theories predict the violation of Lorentz symmetry, which could potentially be spotted in low-energy experiments. Using ytterbium ions could improve the current sensitivity bounds by five orders of magnitude.

    • V. A. Dzuba
    • V. V. Flambaum
    • H. Häffner
    Research
    Nature Physics
    Volume: 12, P: 465-468

  • An electronic analogue of a Michelson–Morley experiment, in which an electron wave packet bound inside a calcium ion is split into two parts and subsequently recombined, demonstrates that the relative change in orientation of the two parts that results from the Earth’s rotation reveals no anisotropy in the electron dispersion; this verification of Lorentz symmetry improves on the precision of previous tests by a factor of 100.

    • T. Pruttivarasin
    • M. Ramm
    • H. Häffner
    Research
    Nature
    Volume: 517, P: 592-595

  • Deep γ-ray observations of the Galactic Centre with arcminute angular resolution show traces of petaelectronvolt protons within the central ten parsecs of our Galaxy; the accelerator of these particles could have provided a substantial contribution to Galactic cosmic rays in the past.

    • A. Abramowski
    • F. Aharonian
    • HESS Collaboration
    Research
    Nature
    Volume: 531, P: 476-479