Coherent optical control of the spin of a single hole in a quantum dot
This thesis describes experiments on the initialisation, coherent control, and readout of a single hole spin trapped in a self assembled InGaAs semiconductor quantum dot. High fidelity initialisation of a hole spin state is achieved by the fast ionisation of a spin polarised neutral exciton under an...
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University of Sheffield
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ndltd-bl.uk-oai-ethos.bl.uk-5575052017-10-04T03:25:01ZCoherent optical control of the spin of a single hole in a quantum dotGodden, Timothy MarkFox, Mark2012This thesis describes experiments on the initialisation, coherent control, and readout of a single hole spin trapped in a self assembled InGaAs semiconductor quantum dot. High fidelity initialisation of a hole spin state is achieved by the fast ionisation of a spin polarised neutral exciton under an applied electric field and in a Faraday geometry magnetic field. The preparation of a coherent superposition state is demonstrated by observing the precession of the hole spin about a Voigt geometry magnetic field. The hole spin dephasing time is deduced from the decay of the spin contrast. Coherent optical rotation of the hole spin state about the z-axis is demonstrated using the geometric phase shift induced by a picosecond laser pulse. By combining the precession of the spin about the x-axis, and optical rotations about the z-axis, full quantum control of a hole spin is demonstrated over the surface of the Bloch sphere. This is an important prerequisite for the use of a hole spin as a qubit for quantum information processing applications.621.38152University of Sheffieldhttp://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557505http://etheses.whiterose.ac.uk/2190/Electronic Thesis or Dissertation |
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621.38152 Godden, Timothy Mark Coherent optical control of the spin of a single hole in a quantum dot |
description |
This thesis describes experiments on the initialisation, coherent control, and readout of a single hole spin trapped in a self assembled InGaAs semiconductor quantum dot. High fidelity initialisation of a hole spin state is achieved by the fast ionisation of a spin polarised neutral exciton under an applied electric field and in a Faraday geometry magnetic field. The preparation of a coherent superposition state is demonstrated by observing the precession of the hole spin about a Voigt geometry magnetic field. The hole spin dephasing time is deduced from the decay of the spin contrast. Coherent optical rotation of the hole spin state about the z-axis is demonstrated using the geometric phase shift induced by a picosecond laser pulse. By combining the precession of the spin about the x-axis, and optical rotations about the z-axis, full quantum control of a hole spin is demonstrated over the surface of the Bloch sphere. This is an important prerequisite for the use of a hole spin as a qubit for quantum information processing applications. |
author2 |
Fox, Mark |
author_facet |
Fox, Mark Godden, Timothy Mark |
author |
Godden, Timothy Mark |
author_sort |
Godden, Timothy Mark |
title |
Coherent optical control of the spin of a single hole in a quantum dot |
title_short |
Coherent optical control of the spin of a single hole in a quantum dot |
title_full |
Coherent optical control of the spin of a single hole in a quantum dot |
title_fullStr |
Coherent optical control of the spin of a single hole in a quantum dot |
title_full_unstemmed |
Coherent optical control of the spin of a single hole in a quantum dot |
title_sort |
coherent optical control of the spin of a single hole in a quantum dot |
publisher |
University of Sheffield |
publishDate |
2012 |
url |
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557505 |
work_keys_str_mv |
AT goddentimothymark coherentopticalcontrolofthespinofasingleholeinaquantumdot |
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1718543490613248000 |