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arXiv · 1603.03384

Trapped-ion quantum logic with global radiation fields

S. Weidt·J. Randall·S. C. Webster·K. Lake·A. E. Webb·I. Cohen·T. Navickas·B. Lekitsch·A. Retzker·W. K. Hensinger
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Abstract

Trapped ions are a promising tool for building a large-scale quantum computer. However, the number of required radiation fields for the realisation of quantum gates in any proposed ion-based architecture scales with the number of ions within the quantum computer, posing a major obstacle when imagining a device with millions of ions. Here we present a fundamentally different concept for trapped-ion quantum computing where this detrimental scaling entirely vanishes, replacing millions of radiation fields with only a handful of fields. The method is based on individually controlled voltages applied to each logic gate location to facilitate the actual gate operation analogous to a traditional transistor architecture within a classical computer processor. To demonstrate the key principle of this approach we implement a versatile quantum gate method based on long-wavelength radiation and use this method to generate a maximally entangled state of two quantum engineered clock-qubits with fidelity 0.985(12). This quantum gate also constitutes a simple-to-implement tool for quantum metrology, sensing and simulation.

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S. Weidt, J. Randall, S. C. Webster, K. Lake, A. E. Webb, I. Cohen, T. Navickas, B. Lekitsch, A. Retzker, W. K. Hensinger. 2016-03-10. Trapped-ion quantum logic with global radiation fields. https://doi.org/10.1103/physrevlett.117.220501

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