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Reference: Erik M. Gauger, (2010). Applications of quantum coherence in condensed matter nanostructures. DPhil. University of Oxford.Citable link to this page:

 

Applications of quantum coherence in condensed matter nanostructures

Abstract: This thesis is concerned with studying the fascinating quantum properties of real-world nanostructures embedded in a noisy condensed matter environment. The interaction with light is used for controlling and manipulating the quantum state of the systems considered here. In some instances, laser pulses also provide a way of actively probing and controlling environmental interactions.The first two research chapters assess two different ways of performing all-optical spin qubit gates in self-assembled quantum dots. The principal conclusion is that an `adiabatic' control technique holds the promise of achieving a high fidelity when all primary sources of decoherence are taken into account.In the next chapter, it is shown that an optically driven quantum dot exciton interacting with the phonons of the surrounding lattice acts as a heat pump. Further, a model is developed which predicts the temperature-dependent damping of Rabi oscillations caused by bulk phonons, finding an excellent agreement with experimental data.A different system is studied in the following chapter: two electron spin qubits with no direct interaction, yet both exchange-coupled to an optically active mediator spin. The results of this study show that these general assumptions are sufficient for generating controlled electron spin entanglement over a wide range of parameters, even in the presence of noise.Finally, the Radical Pair model of the avian compass is investigated in the light of recent experimental results, leading to the surprising prediction that the electron spin coherence time in this molecular system seems to approach the millisecond timescale.

Digital Origin:Born digital Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford

Contributors

Brendon LovettMore by this contributor

RoleSupervisor

 

Simon BenjaminMore by this contributor

RoleSupervisor

 Bibliographic Details

Issue Date: 2010

Copyright Date: 2009 Identifiers

Urn: uuid:fb792980-bfc4-4771-b5d5-b9ecc7d40cd8 Item Description

Type: thesis;

Language: en Keywords: quantum dots phonons adiabatic quantum gates phase gates entanglement radical pair model of avian compassSubjects: Quantum information processing Nanostructures Semiconductor devices Tiny URL: ora:3293

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Author: Erik M. Gauger - institutionUniversity of Oxford facultyMathematical,Physical and Life Sciences Division - Materials oxfordColleg

Source: https://ora.ox.ac.uk/objects/uuid:fb792980-bfc4-4771-b5d5-b9ecc7d40cd8



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