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  • 1.
    Higgins, Gerard
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Universität Innsbruck, Austria.
    Li, Weibin
    Pokorny, Fabian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Zhang, Chi
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Kress, Florian
    Maier, Christine
    Haag, Johannes
    Bodart, Quentin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Lesanovsky, Igor
    Hennrich, Markus
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Single Strontium Rydberg Ion Confined in a Paul Trap2017Inngår i: Physical Review X, ISSN 2160-3308, E-ISSN 2160-3308, Vol. 7, nr 2, artikkel-id 021038Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 2.
    Higgins, Gerard
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Universität Innsbruck, Austria.
    Pokorny, Fabian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Zhang, Chi
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Bodart, Quentin
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Hennrich, Markus
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Coherent Control of a Single Trapped Rydberg Ion2017Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, nr 22, artikkel-id 220501Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 3.
    Pokorny, Fabian
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Microwave dressing of a trapped strontium Rydberg ion2019Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    Trapped Rydberg ions are a novel platform for quantum technologies, envisaged to combine the excellent control of trapped ions with the strong interactions found in neutral Rydberg atom systems. While in recent years trapped ions have been coherently excited to Rydberg states and were shown to be stable in the trapping field, strongly interacting trapped Rydberg ions have yet to be realized.

    Strong interactions between Rydberg ions are facilitated by microwave dressing.

    In this work the microwave dressing of a single trapped Rydberg ions is studied.

    The ion is used as a microwave field probe and the polarizability of Rydberg S- and P superposition states is investigated.

    This work presents an important stepping stone on the way to the goal of trapped Rydberg ion quantum gates.

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