Trapped-ion antennae for the transmission of quantum information

M. Harlander, R. Lechner, M. Brownnutt, R. Blatt () and W. Hänsel
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M. Harlander: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25
R. Lechner: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25
M. Brownnutt: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25
R. Blatt: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25
W. Hänsel: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25

Nature, 2011, vol. 471, issue 7337, 200-203

Abstract: Linkage at the quantum level The harmonic oscillator is a simple and ubiquitous physical system, and various oscillators functioning at the quantum mechanical level are known. Previously, linkage between two quantum mechanical oscillators has been achieved only indirectly, but two groups now demonstrate direct coupling at the quantum level between two harmonic oscillators in separate locations. Such systems could be used as the building blocks for quantum information processors and simulators. Brown et al. achieve direct controllable coupling between 9Be+ ions held 40 micrometres apart in trapping potentials. In a similar experiment, Harlander et al. couple single 40Ca+ ions trapped 54 μm apart. In their system, additional ions act as antennae to amplify the coupling.

Date: 2011
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DOI: 10.1038/nature09800

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