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Showing 1–9 of 9 results
Advanced filters: Author: R. Gerritsma Clear advanced filters

  • The Dirac equation successfully merges quantum mechanics with special relativity. It predicts some peculiar effects such as 'Zitterbewegung', an unexpected quivering motion of a free relativistic quantum particle. This and other predicted phenomena are key fundamental examples for understanding relativistic quantum effects, but are difficult to observe in real particles. Here, using a single trapped ion set to behave as a free relativistic quantum particle, a quantum simulation of the one-dimensional Dirac equation is demonstrated.

    • R. Gerritsma
    • G. Kirchmair
    • C. F. Roos
    Research
    Nature
    Volume: 463, P: 68-71

  • The question of whether quantum phenomena can be explained by classical models with hidden variables is the subject of a long-lasting debate. One feature of classical models that is thought to be in conflict with quantum mechanics is non-contextuality, with experiments undertaken with photons and neutrons seeming to support this. However, these tests required the generation of special quantum states and left various loopholes open. Here an experiment is performed with trapped ions that overcomes these problems and cannot be explained in non-contextual terms.

    • G. Kirchmair
    • F. Zähringer
    • C. F. Roos
    Research
    Nature
    Volume: 460, P: 494-497

  • A highly efficient method is demonstrated for detecting individual photons scattering from short-lived transitions in single trapped ions. An entangled state is used to amplify the tiny momentum kick an ion receives on scattering a photon. Cat-state spectroscopy has an 18-fold higher measurement sensitivity than the direct detection method.

    • C. Hempel
    • B. P. Lanyon
    • C. F. Roos
    Research
    Nature Photonics
    Volume: 7, P: 630-633

  • Cooling an atom–ion hybrid system and bringing it into the quantum regime is challenging owing to the unavoidable heating caused by atom–ion collisions. Here a new record low is achieved in such a system, and the quantum effect starts to manifest.

    • T. Feldker
    • H. Fürst
    • R. Gerritsma
    Research
    Nature Physics
    Volume: 16, P: 413-416

  • Extending qubit coherence times represent one of the key challenges for quantum technologies. Here, after properly suppressing magnetic-field fluctuations, frequency instability and leakage of the microwave reference-oscillator, the authors infer coherence times of 5500 s for an Yb ion qubit.

    • Pengfei Wang
    • Chun-Yang Luan
    • Kihwan Kim
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-8

  • Experimental progress in controlling and manipulating trapped atomic ions has opened the door for a series of proof-of-principle quantum simulations. This article reviews these experiments, together with the methods and tools that have enabled them, and provides an outlook on future directions in the field.

    • R. Blatt
    • C. F. Roos
    Reviews
    Nature Physics
    Volume: 8, P: 277-284