The Geonium Chip: engineering a scalable planar Penning trap

Pinder, Jonathan (2017) The Geonium Chip: engineering a scalable planar Penning trap. Doctoral thesis (PhD), University of Sussex.

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Abstract

In this thesis is presented the realisation of `The Geonium Chip', a novel planar Penning
trap. The chip is designed with the goal of building a truly scalable planar Penning
trap, while retaining the accuracy of 3D traps. Manufactured with conventional metalon-
silicon microfabrication techniques, the chip takes the 5 electrodes of the compensated
cylindrical trap and projects them onto a ground-plane surface, thus forming the basis
for its layout by reducing the electrode shape to an array of at rectangular surfaces.
In this thesis I describe the conception, design and construction of a full cryogenic set-up,
including the magnetics, for trapping and observing a single electron in the Geonium
Chip Penning trap. The cyclotron mode of the trapped electron lies in the microwave
regime, and thus the Geonium Chip has the potential to become a powerful building
block for quantum microwave circuits, with coherent coupling to the cyclotron degree
of freedom. This will also allow non-destructive measurement and interaction with the
spin state of the electron. The development of the experimental process is detailed from
scratch including the design, fabrication, and testing of the Geonium Chip, as well as
the design, fabrication and testing of the experimental apparatus. The original solutions
and space saving designs developed as part of the construction process are detailed, such
as the custom on-chip cryogenic vacuum chamber, planar magnetic field source, and the
LED-based electron loading system. The vacuum chamber and control systems are
also described, and the in-house manufacturing capabilities of the Geonium group are
detailed at length, with an emphasis on rapid prototyping high-accuracy components
suitable for experimental use. The apparatus built within this PhD is within a few weeks
of performing the first loading of electrons into the chip trap.

Item Type: Thesis (Doctoral)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0501 Electricity and magnetism > QC0522 Electricity > QC0680 Quantum electrodynamics
Depositing User: Library Cataloguing
Date Deposited: 01 Mar 2017 11:25
Last Modified: 01 Mar 2017 11:25
URI: http://sro.sussex.ac.uk/id/eprint/66955

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