Nuclear spin control and manipulation in self-assembled quantum dots

  • Janna Hinchliff

Student thesis: Doctoral ThesisDoctor of Philosophy (PhD)

Abstract

Quantum dots come in many shapes and sizes, with a huge variety of material and optical
properties. The subject of this thesis will be to examine the environment of self-assembled
InGaAs quantum dots for applications in quantum information processing. Quantum dots
are made up of many atoms, each of which has a spin and it is the dynamics of these nuclear spins
and their effect on an electron spin confined in the quantum dot that we will discuss. There are
numerous applications for quantum dots in the field of quantum information processing, many of
which exploit their atom-like optical properties using light-matter interactions. The application
that will be the focus of this thesis is the nuclear spin quantum memory - a device that is able to
store quantum states on long timescales.
We will show both theoretical and experimental results that indicate ways in which we can
gain control of the nuclear spin dynamics. We demonstrate this by designing an optical setup
capable of measuring the precession frequency of an electron spin and show how we can induce
changes in this precession frequency by controlling the configuration of the nuclear spin bath.
We also discuss how we can manipulate this system to create a nuclear spin quantum memory -
storing the initial state of the electron spin in a single nucleus. We also discuss how we can exploit
the nuclei within the quantum dot as qubits to expand this protocol into a full-scale quantum
computing model.
Date of Award25 Jun 2019
Original languageEnglish
Awarding Institution
  • The University of Bristol
SupervisorDara P S Mccutcheon (Supervisor) & Ruth Oulton (Supervisor)

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