Chiara Decaroli


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Decaroli

First Name

Chiara

ORCID

0000-0001-5806-5200

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2019 - 201912020 - 20223
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Publications 1 - 4 of 4
  • Design, fabrication and characterisation of a micro-fabricated stacked-wafer segmented ion trap with two X-junctions
    Item type: Journal Article
    Decaroli, Chiara; Matt, Roland; Oswald, Robin; et al. (2021)
    Quantum Science and Technology
    We describe the implementation of a three-dimensional Paul ion trap fabricated from a stack of precision-machined silica glass wafers, which incorporates a pair of junctions for 2-dimensional ion transport. The trap has 142 dedicated electrodes which can be used to define multiple potential wells in which strings of ions can be held. By supplying time-varying potentials, this also allows for transport and re-configuration of ion strings. We describe the design, simulation, fabrication and packaging of the trap, including explorations of different parameter regimes and possible optimizations and design choices. We give results of initial testing of the trap, including measurements of heating rates and junction transport.
  • Multi-wafer ion traps for scalable quantum information processing
    Item type: Doctoral Thesis
    Decaroli, Chiara (2021)
    In this work, I present the design, fabrication and initial characterisation of a 3-dimensional segmented ion trap with two junctions of the X-type. The trap wafers are manufactured using selective femtosecond laser-etching of silica glass. This technology allows for the machining of flexible 3-dimensional features, and expands the types of trap geometries that can be achieved compared to previously used manufacturing methods such as laser-cutting. The additional design freedom allows us to optimise the junction geometry and to investigate a compromise between the confinement at the center of the junction and the shape of the radio-frequency pseudopotential barriers created by the junction near its center. I discuss the limitations encountered during the fabrication and assembly process, and present the initial loading and characterisation of the trap. This early operation informs a second design, which incorporates new features to improve the trap fabrication and performance. This thesis also explores an alternative trap geometry for scaling, which was designed, fabricated and tested as part of the EU-funded PIEDMONS project. The hybrid PIEDMONS trap is made of a surface trap waferbonded to additional top electrodes, which enhance the confinement of the ions, while ensuring an efficient and reliable fabrication of the bottom wafer. I discuss the design and experimental characterisation of the hybrid trap, and draw a comparison between trap geometries and fabrication methods. This work is a step towards exploring trap design and fabrication methods for a scalable trapped-ion quantum computer based on the quantum-CCD architecture. It outlines the current technology limitations and provides an outlook for future developments.
  • Industrially microfabricated ion trap with 1 eV trap depth
    Item type: Journal Article
    Auchter, Silke; Axline, Christopher James; Decaroli, Chiara; et al. (2022)
    Quantum Science and Technology
    Scaling trapped-ion quantum computing will require robust trapping of at least hundreds of ions over long periods, while increasing the complexity and functionality of the trap itself. Symmetric three-dimensional (3D) structures enable high trap depth, but microfabrication techniques are generally better suited to planar structures that produce less ideal conditions for trapping. We present an ion trap fabricated on stacked eight-inch wafers in a large-scale micro-electro-mechanical system microfabrication process that provides reproducible traps at a large volume. Electrodes are patterned on the surfaces of two opposing wafers bonded to a spacer, forming a 3D structure with 2.5 μm standard deviation in alignment across the stack. We implement a design achieving a trap depth of 1 eV for a ⁴⁰Ca⁺ ion held at 200 μm from either electrode plane. We characterize traps, achieving measurement agreement with simulations to within ±5% for mode frequencies spanning 0.6–3.8 MHz, and evaluate stray electric field across multiple trapping sites. We measure motional heating rates over an extensive range of trap frequencies, and temperatures, observing 40 phonons/s at 1 MHz and 185 K. This fabrication method provides a highly scalable approach for producing a new generation of 3D ion traps.
  • Segmented ion-trap fabrication using high precision stacked wafers
    Item type: Journal Article
    Ragg, Simon G.; Decaroli, Chiara; Lutz, Thomas; et al. (2019)
    Review of Scientific Instruments
Publications 1 - 4 of 4