Godden, Timothy Mark (2012) Coherent optical control of the spin of a single hole in a quantum dot. PhD thesis, University of Sheffield.
Available under License Creative Commons Attribution-Noncommercial-No Derivative Works 2.0 UK: England & Wales.
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.
|Item Type:||Thesis (PhD)|
|Academic Units:||The University of Sheffield > Faculty of Science (Sheffield) > Physics and Astronomy (Sheffield)|
|Depositing User:||Dr Timothy Mark Godden|
|Date Deposited:||11 Apr 2012 10:44|
|Last Modified:||08 Aug 2013 08:48|