Ytterbium ion trapping and microfabrication of ion trap arrays

Sterling, Robin C (2012) Ytterbium ion trapping and microfabrication of ion trap arrays. Doctoral thesis (DPhil), University of Sussex.

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Abstract

Over the past 15 years ion traps have demonstrated all the building blocks required of a
quantum computer. Despite this success, trapping ions remains a challenging task, with
the requirement for extensive laser systems and vacuum systems to perform operations on
only a handful of qubits. To scale these proof of principle experiments into something that
can outperform a classical computer requires an advancement in the trap technologies that
will allow multiple trapping zones, junctions and utilize scalable fabrication technologies.
I will discuss the construction of an ion trapping experiment, focussing on my work
towards the laser stabilization and ion trap design but also covering the experimental
setup as a whole. The vacuum system that I designed allows the mounting and testing of
a variety of ion trap chips, with versatile optical access and a fast turn around time.
I will also present the design and fabrication of a microfabricated Y junction and a 2-
dimensional ion trap lattice. I achieve a suppression of barrier height and small variation of
secular frequency through the Y junction, aiding to the junctions applicability to adiabatic
shuttling operations. I also report the design and fabrication of a 2-D ion trap lattice.
Such structures have been proposed as a means to implement quantum simulators and to
my knowledge is the first microfabricated lattice trap.
Electrical testing of the trap structures was undertaken to investigate the breakdown
voltage of microfabricated structures with both static and radio frequency voltages. The
results from these tests negate the concern over reduced rf voltage breakdown and in
fact demonstrates breakdown voltages significantly above that typically required for ion
trapping. This may allow ion traps to be designed to operate with higher voltages and
greater ion-electrode separations, reducing anomalous heating.
Lastly I present my work towards the implementation of magnetic fields gradients and
microwaves on chip. This may allow coupling of the ions internal state to its motion using
microwaves, thus reducing the requirements for the use of laser systems.

Item Type: Thesis (Doctoral)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: Library Cataloguing
Date Deposited: 27 Jun 2012 06:23
Last Modified: 04 Sep 2015 13:36
URI: http://sro.sussex.ac.uk/id/eprint/39684

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