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  • 1.
    Higgins, Gerard
    et al.
    Stockholm University, Faculty of Science, Department of Physics. Universität Innsbruck, Austria.
    Li, Weibin
    Pokorny, Fabian
    Stockholm University, Faculty of Science, Department of Physics.
    Zhang, Chi
    Stockholm University, Faculty of Science, Department of Physics.
    Kress, Florian
    Maier, Christine
    Haag, Johannes
    Bodart, Quentin
    Stockholm University, Faculty of Science, Department of Physics.
    Lesanovsky, Igor
    Hennrich, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    A single strontium Rydberg ion confined in a Paul trapManuscript (preprint) (Other academic)
    Abstract [en]

    Trapped Rydberg ions are a promising new system for quantum information processing. They have the potential to join the precise quantum operations of trapped ions and the strong, long-range interactions between Rydberg atoms. Technically, the ion trap will need to stay active while exciting the ions into the Rydberg state, else the strong Coulomb repulsion will quickly push the ions apart. Thus, a thorough understanding of the trap effects on Rydberg ions is essential for future applications. Here we report the observation of two fundamental trap effects. First, we investigate the interaction of the Rydberg electron with the quadrupolar electric trapping field. This effect leads to Floquet sidebands in the spectroscopy of Rydberg D-states whereas Rydberg S-states are unaffected due to their symmetry. Second, we report on the modified trapping potential in the Rydberg state compared to the ground state which results from the strong polarizability of the Rydberg ion. We observe the resultant energy shifts as a line broadening which can be suppressed by cooling the ion to the motional ground state in the directions orthogonal to the excitation laser.

  • 2.
    Higgins, Gerard
    et al.
    Stockholm University, Faculty of Science, Department of Physics. Universität Innsbruck, Austria.
    Li, Weibin
    Pokorny, Fabian
    Stockholm University, Faculty of Science, Department of Physics.
    Zhang, Chi
    Stockholm University, Faculty of Science, Department of Physics.
    Kress, Florian
    Maier, Christine
    Haag, Johannes
    Bodart, Quentin
    Stockholm University, Faculty of Science, Department of Physics.
    Lesanovsky, Igor
    Hennrich, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Single Strontium Rydberg Ion Confined in a Paul Trap2017In: Physical Review X, ISSN 2160-3308, E-ISSN 2160-3308, Vol. 7, no 2, 021038Article in journal (Refereed)
    Abstract [en]

    Trapped Rydberg ions are a promising new system for quantum information processing. They have the potential to join the precise quantum operations of trapped ions and the strong, long-range interactions between Rydberg atoms. Combining the two systems is not at all straightforward. Rydberg atoms are severely affected by electric fields which may cause Stark shifts and field ionization, while electric fields are used to trap ions. Thus, a thorough understanding of the physical properties of Rydberg ions due to the trapping electric fields is essential for future applications. Here, we report the observation of two fundamental trap effects. First, we investigate the interaction of the Rydberg electron with the trapping electric quadrupole fields which leads to Floquet sidebands in the excitation spectra. Second, we report on the modified trapping potential in the Rydberg state compared to the ground state that results from the strong polarizability of the Rydberg ion. By controlling both effects we observe resonance lines close to their natural linewidth demonstrating an unprecedented level of control of this novel quantum platform.

  • 3.
    Higgins, Gerard
    et al.
    Stockholm University, Faculty of Science, Department of Physics. Universität Innsbruck, Austria.
    Pokorny, Fabian
    Stockholm University, Faculty of Science, Department of Physics.
    Zhang, Chi
    Stockholm University, Faculty of Science, Department of Physics.
    Bodart, Quentin
    Stockholm University, Faculty of Science, Department of Physics.
    Hennrich, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Coherent Control of a Single Trapped Rydberg Ion2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 22, 220501Article in journal (Refereed)
    Abstract [en]

    Trapped Rydberg ions are a promising novel approach to quantum computing and simulations. They are envisaged to combine the exquisite control of trapped ion qubits with the fast two-qubit Rydberg gates already demonstrated in neutral atom experiments. Coherent Rydberg excitation is a key requirement for these gates. Here, we carry out the first coherent Rydberg excitation of an ion and perform a single-qubit Rydberg gate, thus demonstrating basic elements of a trapped Rydberg ion quantum computer.

  • 4.
    Higgins, Gerard
    et al.
    Stockholm University, Faculty of Science, Department of Physics. Universität Innsbruck, Austria.
    Pokorny, Fabian
    Stockholm University, Faculty of Science, Department of Physics.
    Zhang, Chi
    Stockholm University, Faculty of Science, Department of Physics.
    Quentin, Bodart
    Stockholm University, Faculty of Science, Department of Physics.
    Markus, Hennrich
    Stockholm University, Faculty of Science, Department of Physics.
    Coherent control of a single trapped Rydberg ionManuscript (preprint) (Other academic)
    Abstract [en]

    Trapped Rydberg ions are a promising novel approach to quantum computing and simulations. They are envisaged to combine the exquisite control of trapped ion qubits with the fast two-qubit Rydberg gates already demonstrated in neutral atom experiments. Coherent Rydberg excitation is a key requirement for these gates. Here, we carry out the first coherent Rydberg excitation of an ion and perform a single-qubit Rydberg gate, thus demonstrating basic elements of a trapped Rydberg ion quantum computer.

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