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Theory and Modelling of Pulse-driven...

Gustin, Chris.

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Theory and Modelling of Pulse-driven Quantum Dots in Nanophotonic Structures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Theory and Modelling of Pulse-driven Quantum Dots in Nanophotonic Structures./
Author:	Gustin, Chris.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	151 p.
Notes:	Source: Masters Abstracts International, Volume: 81-09.
Contained By:	Masters Abstracts International81-09.
Subject:	Quantum physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27800577
ISBN:	9781392432341

Theory and Modelling of Pulse-driven Quantum Dots in Nanophotonic Structures.
Gustin, Chris.

Theory and Modelling of Pulse-driven Quantum Dots in Nanophotonic Structures. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 151 p.

Source: Masters Abstracts International, Volume: 81-09.

Thesis (M.A.Sc.)--Queen's University (Canada), 2019.

This item must not be sold to any third party vendors.

Quantum dots (QDs) integrated in nanophotonic environments provide an excellent platform for quantum information technologies and engineerable light-matter interactions. One application is a solid-state single photon source (SPS), where a QD in an optical cavity can be used to emit antibunched photons. This setup can provide photons on-demand if excited with a pulse, which renders the problem of modelling the QD SPS a genuinely time-dependent problem in quantum optics. Furthermore, the QD-cavity system interacts with its environment via electron-phonon scattering with the surrounding lattice as well as coupling to the photonic background, which causes decoherence and necessitates an open quantum system framework. In this thesis, we study pulse-driven QDs coupled to photonic environments and phonon reservoirs using an open system quantum optics approach, with a focus on elements unique to the time-dependent dynamics. After introducing the necessary theoretical background, first we present an analysis of the impact of electron-phonon scattering on a proposal for a QD-cavity system which uses adiabatic passage to generate triggered single photons of orthogonal polarization to the excitation fields. Next, we provide an analysis of the resonance fluorescence spectrum of two-level systems (including QDs) driven by a pulse, with particular emphasis on where spectral asymmetries can arise. Last, we study resonantly excited QD-cavity SPSs with attention given to how the excitation pulse can affect the quantum dynamics and SPS figures-of-merit. We show that the excitation process can degrade the figures-of-merit to a degree comparable to the electron-phonon interaction. We also find that a dynamical decoupling effect between the QD and its environment plays a large role in suppressing multi-photon emission, and we demonstrate how this effect can be modelled by using a time-dependent and time-convolutionless quantum master equation which incorporates non-Markovian effects associated with the pulse. These findings have implications on both the theoretical understanding of pulsed QD light-matter interactions, as well as on how SPSs can be optimized.

ISBN: 9781392432341Subjects--Topical Terms:

726746
Quantum physics.
Subjects--Index Terms:

Nanophotonic structures

Theory and Modelling of Pulse-driven Quantum Dots in Nanophotonic Structures.
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520 $a Quantum dots (QDs) integrated in nanophotonic environments provide an excellent platform for quantum information technologies and engineerable light-matter interactions. One application is a solid-state single photon source (SPS), where a QD in an optical cavity can be used to emit antibunched photons. This setup can provide photons on-demand if excited with a pulse, which renders the problem of modelling the QD SPS a genuinely time-dependent problem in quantum optics. Furthermore, the QD-cavity system interacts with its environment via electron-phonon scattering with the surrounding lattice as well as coupling to the photonic background, which causes decoherence and necessitates an open quantum system framework. In this thesis, we study pulse-driven QDs coupled to photonic environments and phonon reservoirs using an open system quantum optics approach, with a focus on elements unique to the time-dependent dynamics. After introducing the necessary theoretical background, first we present an analysis of the impact of electron-phonon scattering on a proposal for a QD-cavity system which uses adiabatic passage to generate triggered single photons of orthogonal polarization to the excitation fields. Next, we provide an analysis of the resonance fluorescence spectrum of two-level systems (including QDs) driven by a pulse, with particular emphasis on where spectral asymmetries can arise. Last, we study resonantly excited QD-cavity SPSs with attention given to how the excitation pulse can affect the quantum dynamics and SPS figures-of-merit. We show that the excitation process can degrade the figures-of-merit to a degree comparable to the electron-phonon interaction. We also find that a dynamical decoupling effect between the QD and its environment plays a large role in suppressing multi-photon emission, and we demonstrate how this effect can be modelled by using a time-dependent and time-convolutionless quantum master equation which incorporates non-Markovian effects associated with the pulse. These findings have implications on both the theoretical understanding of pulsed QD light-matter interactions, as well as on how SPSs can be optimized.
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