Dissertations / Theses on the topic 'Quantum electrodynamics'
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Golz, Marcel. "Parametric quantum electrodynamics." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19776.
Full textThis thesis is concerned with the study of Schwinger parametric Feynman integrals in quantum electrodynamics. Using a variety of tools from combinatorics and graph theory, significant simplification of the integrand is achieved. After a largely self-contained introduction to Feynman graphs and integrals, the derivation of the Schwinger parametric representation from the standard momentum space integrals is reviewed in full detail for both scalar theories and quantum electrodynamics. The derivatives needed to express Feynman integrals in quantum electrodynamics in their parametric version are found to contain new types of graph polynomials based on cycle and bond subgraphs. Then the tensor structure of quantum electrodynamics, products of Dirac matrices and their traces, is reduced to integer factors with a diagrammatic interpretation of their contraction. Specifically, chord diagrams with a particular colouring are used. This results in a parametric integrand that contains sums of products of cycle and bond polynomials over certain subsets of such chord diagrams. Further study of the polynomials occurring in the integrand reveals connections to other well-known graph polynomials, the Dodgson and spanning forest polynomials. This is used to prove an identity that expresses some of the very large sums over chord diagrams in a very concise form. In particular, this leads to cancellations that massively simplify the integrand.
Viehmann, Oliver. "Multi-qubit circuit quantum electrodynamics." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-160998.
Full textHabibian, Hessam. "Cavity Quantum Electrodynamics with Ultracold Atoms." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/120180.
Full textIn this thesis we investigate the interactions between ultracold atoms confined by a periodic potential and a mode of a high-finesse optical cavity whose wavelength is incommensurate with the potential periodicity. The atoms are driven by a probe laser and can scatter photons into the cavity field. When the von-Laue condition is not satisfied, there is no coherent emission into the cavity mode. We consider this situation and identify conditions for which different nonlinear optical processes can occur. We characterize the properties of the light when the system can either operate as a degenerate parametric amplifier or as a source of antibunched light. Moreover, we show that the stationary entanglement between the light and spinwavemodes of the array can be generated. In the second part we consider the regime in which the zero-point motions of the atoms become relevant in the dynamics of atom-photon interactions. Numerical calculations show that for large parameter regions, cavity backaction forces the atoms into clusters with a local checkerboard density distribution. The clusters are phase-locked to one another so as to maximize the number of intracavity photons.
Kannan, Bharath. "Waveguide quantum electrodynamics with superconducting qubits." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120400.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 85-87).
Experiments in quantum optics have long been implemented with atoms in 3D free space or with atoms interacting with cavities. Over the past decade, the field of microwave quantum optics using superconducting circuits has gained a tremendous amount of attention. In particular, the confinement of photonic modes to 1D enables a new parameter regime of strong interactions between qubits and open waveguides. In these setups, known as waveguide quantum electrodynamics (WQED), superconducting qubits interact with a continuum of propagating photonic modes. In this thesis, we will explore the physics of WQED devices that consist of multiple qubits and their potential application to quantum information and simulation.
by Bharath Kannan.
S.M.
Kohler, Shane Jerome. "Non-linear effects in quantum electrodynamics." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5279.
Full textDiniz, Igor. "Quantum electrodynamics in superconducting artificial atoms." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY048/document.
Full textCette thèse porte sur deux problèmes théoriques d'électrodynamique quantique en circuits supraconducteurs. Nous avons d'abord étudié les conditions d'obtention du couplage fort entre un résonateur et une distribution continue d'émetteurs élargie de façon inhomogène. Le développement de ce formalisme est fortement motivé par les récentes propositions d'utiliser des ensembles de degrés de liberté microscopiques pour réaliser des mémoires quantiques. En effet, ces systèmes bénéficient du couplage collectif au résonateur, tout en conservant les propriétés de relaxation d'un seul émetteur. Nous discutons l'influence de l'élargissement inhomogène sur l'existence et les propriétés de cohérence des pics polaritoniques obtenus dans le régime de couplage fort. Nous constatons que leur cohérence dépend de façon critique de la forme de la distribution et pas uniquement de sa largeur. En tenant compte de l'élargissement inhomogène, nous avons pu simuler avec une grande précision de nombreux résultats expérimentaux pionniers sur un ensemble de centres NV. La modélisation s'est révélée un outil puissant pour obtenir les propriétés des ensembles de spins couplés à un résonateur. Nous proposons également une méthode originale de mesure de l'état de qubits Josephson fondée sur un SQUID DC avec une inductance de boucle élevée. Ce système est décrit par un atome artificiel avec des niveaux d'énergie en forme de diamant où nous définissons les qubits logique et ancilla couplés entre eux par un terme Kerr croisé. En fonction de l'état du qubit logique, l'ancilla est couplée de manière résonante ou dispersive au résonateur, ce qui provoque un contraste important dans l'amplitude du signal micro-onde transmis par le résonateur. Les simulations montrent que cette méthode originale peut être plus rapide et peut aussi avoir une plus grande fidélité que les méthodes actuellement utilisées dans la communauté des circuits supraconducteurs
Грицунов, А. В., И. Н. Бондаренко, А. Б. Галат, О. В. Глухов, and А. Г. Пащенко. "On the quantum electrodynamics of nanosystems." Thesis, Kharkiv, bookfabrik, 2019. http://openarchive.nure.ua/handle/document/10408.
Full textJeantet, Adrien. "Cavity quantum electrodynamics with carbon nanotubes." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC010/document.
Full textCarbon nanotubes are extensively investigated for their amazing mechanical and electronic properties. Optically, they are excellent candidates for on-demand single-photon sources because they can be electrically excited and they can emit anti-bunched light at room temperature in the telecoms bands. However, their emission efficiency is low, its origins remain unclear and the spectral shape of their photoluminescence is complicated. In this work, we build an original setup combining a confocal microscope and a fiber based micro-cavity which is both spatially and spectrally tunable. With this device, we observed the rise of cavity quantum electrodynamics effects by analyzing the evolution of the dipole-cavity coupling as a function of the cavity volume. We obtained a strong acceleration of the spontaneous emission rate, due to Purcell factors above 100. The associated effective efficiency of the source reaches up to 50%, leading to a brightness of up to 10%, while keeping excellent anti-bunching features. We observe the effect of the cavity coupling as a function of the cavity detuning, and develop a model to account for emitters undergoing exciton-phonon coupling in the presence of a cavity. We show that our single-photon source is tunable on a range of frequencies more than a hundred times higher than the cavity spectral width, opening the way to extensive multiplexing. Further strengthening of the coupling may open the way to the very rich physics of one-dimensional cavity polaritons. And conversely, cavity polaritons could be a tool to understand better the diffusion, and localization properties of excitons in carbon nanotubes. Finally, the original setup build here is extremely versatile and could be used to coupled other types of emitters, such as nano-diamonds or molecules
Helmer, Ferdinand. "Quantum information processing and measurement in circuit quantum electrodynamics." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-102919.
Full textYoung, Andrew Buchanan. "Cavity quantum electrodynamics : applications to solid state quantum information." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720859.
Full textHendrickson, Joshua. "Cavity Quantum Electrodynamics with Quantum Dot - Photonic Crystal Nanocavities." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/196032.
Full textÖzelci, Ersan. "Exploring Fundamental Limits of Quantum Efficiency Measurements Using Quantum Electrodynamics." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22539.
Full textPhotoluminescence techniques play an important role for characterization of various functional fluorophores in the life and material sciences from biology to quantum technologies. A crucial and key parameter for comparing the performance of fluorophores is the photoluminescence quantum efficiency or quantum yield, which presents a direct measure of conversion efficiency of absorbed photons into emitted photons. This quantity characterizes the performance of emitters for applications in optical devices as single photon sources and in the biomedical sector. Several techniques such as optical and photothermal methods are used to measure the photoluminescence quantum efficiency of emitters in various environments and aggregation states. Quantum efficiency measurements can be challenging for fluorophores in solid matrix, in scattering systems and for highly diluted fluorophores embedded to thin films. The research described in this thesis overcomes these challenges by performing quantum efficiency measurement via modifying the spontaneous emission as a fundamental process of light-matter interaction.
Hauck, John C. "Electrodynamics of accelerated systems /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3101024.
Full textBaxter, Colin. "Gauge transformations in non-relativistic quantum electrodynamics." Thesis, University of Essex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292876.
Full textLepert, Guillaume. "Integrated optics for coupled-cavity quantum electrodynamics." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11175.
Full textWalker, Philip. "Radiation and reaction in scalar quantum electrodynamics." Thesis, University of York, 2010. http://etheses.whiterose.ac.uk/996/.
Full textBarlow, Thomas Michael. "Cavity quantum electrodynamics of fibre-cavity networks." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12646/.
Full textHo, Andy C. T. "Imaginary charge quantum electrodynamics : a running coupling analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0005/NQ34551.pdf.
Full textNadeau, Raymond. "Two-loop effective potential of supersymmetric quantum electrodynamics." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75872.
Full textBraverman, Boris. "Cavity quantum electrodynamics with ensembles of ytterbium-171." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120364.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 313-328).
In this thesis, I present the realization of a system applying the tools of cavity quantum electrodynamics to an atomic optical lattice clock. We design and implement a unique experimental cavity structure, with a small radius of curvature mirror on one side and a large mirror on the other side. With this structure, we are able to probe ytterbium-171 atoms in both the weak and strong coupling regimes of cavity quantum electrodynamics. This asymmetric micromirror structure simultaneously offers strong light-atom coupling, mechanical robustness, and excellent access to a large cavity volume. We develop a simple but accurate model for strong light-atom interactions in our system, which allows us to predict the performance of both cavity-assisted quantum non demolition measurements of the atomic state, and the back-action of the probing light onto the atomic state. We find theoretically, and confirm experimentally, that probing the atom-cavity system with two frequencies at the vacuum Rabi peaks of a system with strong collective light-atom coupling generates the largest possible entanglement between the probing light and the atomic state. With this scheme, we demonstrate atomic number measurements within a factor of 2 of the quantum Fisher information limit. By using the quantum back-action of the probing light on the atomic ensemble, we perform squeezing by cavity feedback. We produce states with -11±1 dB of variance squeezing and 14±1 dB of anti squeezing. Using theoretical simulations, we show that states with near-unitary squeezing offer significant advantages for improving atomic clocks compared to previous work. The ability to load large atomic ensembles in the strong coupling regime in our system offers several routes to the generation of highly entangled non-Gaussian quantum states. Such states can be produced by heralded measurements, or by global atom-atom interactions based on unitary spin squeezing. Altogether, we realize a system of unprecedented versatility and great potential for performing a large variety of hybrid atomic clock and cavity QED experiments.
by Boris Braverman.
Ph. D.
Golyk, Vladyslav Alexander. "Non-equilibrium fluctuation induced-phenomena in quantum electrodynamics." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91076.
Full text138
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 120-129).
We study fluctuation-induced phenomena in systems out of thermal equilibrium, resulting from the stochastic nature of quantum and thermal fluctuations of electromagnetic currents and waves. Specifically, we study radiative heat transfer and Casimir forces by applying the scattering formalism that expresses results solely in terms of the classical scattering matrices of the objects. For example, we obtain exact formulas for the heat radiation emitted by long cylindrical objects, as well as for Casimir forces that arise between them. We apply our results to explore the dependence of these phenomena on size and material properties of cylinders. While the scattering formalism is very general and technically can be employed for arbitrary shapes, in practice it is very time-consuming to apply it to the most experimentally-relevant and complex case of objects at close proximity. We examine easier ways to compute the heat transfer in such case. In particular, we develop a small distance expansion for the heat transfer between gently curved objects, in terms of the ratio of distance to radius of curvature. This expansion allows us to rigorously justify the widely used approach of "proximity transfer approximation", and to quantify corrections to it in the limit of small separation. Moreover, we study the role of surface roughness, and show that it may change the distance dependence of the heat transfer as well as Casimir forces between curved objects at proximity. Finally, as an alternative approach we construct general Green-Kubo relations that connect radiative heat transfer, non-equilibrium Casimir forces and vacuum friction between arbitrary objects to fluctuations in equilibrium which may be easier to consider from the perspective of experiment and simulations.
by Vladyslav Alexander Golyk.
Ph. D.
Holland, Eric T. "Cavity State Reservoir Engineering in Circuit Quantum Electrodynamics." Thesis, Yale University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10012490.
Full textEngineered quantum systems are poised to revolutionize information science in the near future. A persistent challenge in applied quantum technology is creating controllable, quantum interactions while preventing information loss to the environment, decoherence. In this thesis, we realize mesoscopic superconducting circuits whose macroscopic collective degrees of freedom, such as voltages and currents, behave quantum mechanically. We couple these mesoscopic devices to microwave cavities forming a cavity quantum electrodynamics (QED) architecture comprised entirely of circuit elements. This application of cavity QED is dubbed Circuit QED and is an interdisciplinary field seated at the intersection of electrical engineering, superconductivity, quantum optics, and quantum information science. Two popular methods for taming active quantum systems in the presence of decoherence are discrete feedback conditioned on an ancillary system or quantum reservoir engineering. Quantum reservoir engineering maintains a desired subset of a Hilbert space through a combination of drives and designed entropy evacuation. Circuit QED provides a favorable platform for investigating quantum reservoir engineering proposals. A major advancement of this thesis is the development of a quantum reservoir engineering protocol which maintains the quantum state of a microwave cavity in the presence of decoherence. This thesis synthesizes strongly coupled, coherent devices whose solutions to its driven, dissipative Hamiltonian are predicted a priori. This work lays the foundation for future advancements in cavity centered quantum reservoir engineering protocols realizing hardware efficient circuit QED designs.
Zhang, Ou. "Effective field theories for quantum chromo- and electrodynamics." Thesis, The University of Arizona, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10247445.
Full textEffective field theories (EFTs) provide frameworks to systematically improve perturbation expansions in quantum field theory. This improvement is essential in quantum chromodynamics (QCD) predictions, both at low energy in the description of low momentum hadron-hadron scattering and at high energy in the description of electron-positron, proton-proton, proton-electron collisions. It is also important in quantum electrodynamics (QED), when electrons interact with a high-intensity, long-wavelength classical field. I introduce the principles and methods of effective field theory and describe my work in three EFTs: First, in the perturbative QCD region, I use soft collinear effective theory (SCET) to prove that strong interaction soft radiation is universal and to increase the QCD accuracy to next-to-next-to-next-to leading logarithm order for new particle searches in hadron colliders. I also compute a new class of non-perturbative, large logarithmic enhancement arising near the elastic limits of deep inelastic scattering and Drell-Yan processes. Second, in the QCD confinement region, I use heavy hadron chiral perturbation theory to study near-threshold enhancements in the scattering of D and π mesons near the threshold for the excited D-meson state, D*, as well as in the scattering of D and D* mesons near the threshold for the exotic hadron X(3872). This work provides a clear picture of the hadronic molecule X(3872) and more profound understanding of the nuclear force between hadrons. Finally, inspired by SCET, I construct a new electron-laser effective field theory to describe highly-relativistic electrons traveling in strong laser fields, extract the universal distribution of electrons in strong electromagnetic backgrounds and its evolution in energy from the separated momentum scales of emitted photons and classical radiation, and predict the rate of wide angle photon emission. I conclude with limitations of EFT methods and some perspectives on what new work may be achieved with these EFTs.
Zhang, Ou, and Ou Zhang. "Effective Field Theories for Quantum Chromo- and Electrodynamics." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/621825.
Full textCardoso, Lucas Tavares. "Towards renormalizability of string-localized massive quantum electrodynamics." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/5621.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
A construção de campos com localização em cordas foi realizada rigorosamente há pouco mais de uma década. Nesta abordagem, os campos são operadores em algum espaço de Hilbert, e portanto não há graus de liberdade não-físicos tais como "ghosts". Além de permitir a construção de campos carregados inteiramente num espaço espaço de Hilbert, os campos com localização em cordas exibem um bom comportamento no regime ultravioleta e, entre outras características, são possíveis candidatos para descreverem consistentemente a matéria escura. No intuito de obter uma prova da renormalizabilidade em modelos perturbativos no esquema de Epstein-Glaser com campos quânticos localizados em cordas, é necessário evidenciar a liberdade que se tem ao definir produtos temporalmente ordenados do Lagrangeano de interação. Este trabalho proporciona um primeiro passo significativo nesta direção. O problema básico é a presença de um conjunto aberto de n-uplas de cordas que não podem ser cronologicamente ordenadas. Nós resolvemos este problema ao mostrar que quase todas (i.e. exceto num subconjunto de medida nula) tais configurações de cordas podem ser dissecadas num número finito de pedaços, os quais por sua vez podem ser cronologicamente ordenados. Com isso, tem-se que o produto temporalmente ordenado de fatores lineares de campos está fixo fora de um conjunto de medida nula de configurações de cordas. A construção do ordenamento temporal geométrico de cordas é feita de modo a servir para o estudo da renormalizabilidade de quaisquer teorias quânticas de campos com localização em cordas.
The construction of string-localized fields was rigorously accomplished a little over a decade ago. In this approach, the fields are operators in some Hilbert space, and therefore there are no unphysical degrees of freedom such as ghosts. In addition to allowing the construction of charged fields entirely in a Hilbert space, the string-localized fields exhibit, in general, a good behavior in the ultraviolet regime and, among other features, the class (representation) of string-localized fields with m = 0 and s = oo are possible candidates to consistently describe dark matter. In order to obtain a proof of renormalizability of perturbative models in the Epstein—Glaser scheme with string-localized quantum fields, one needs to know what freedom one has to define time-ordered products of the interaction Lagrangian. This work provides a first significant step in that direction. The basic issue is the presence of an open set of n-tuples of strings which cannot be chronologically ordered. We resolve it by showing that almost all (i.e. outside a null set) such string configurations can be dissected into finitely many pieces which can indeed be chronologically ordered. This fixes the time-ordered products of linear field factors outside a nullset of string configurations. The construction of the geometric time ordering of strings is realized in such a way that it will serve to study the renormalizability of any quantum field theories with string-localized fields
Stokes, Adam. "On gauge freedom and subsystems in quantum electrodynamics." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/6833/.
Full textFlatten, Lucas Christoph. "Quantum electrodynamics of semiconducting nanomaterials in optical microcavities." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:a5f4797f-ea23-49e4-bd1e-2483154508d6.
Full textRippin, Michael Andrew. "Quantum optics of tailored cavities." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242050.
Full textÖzelci, Ersan [Verfasser]. "Exploring Fundamental Limits of Quantum Efficiency Measurements Using Quantum Electrodynamics / Ersan Özelci." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1229916423/34.
Full textBrown, Solly. "The photon model of the quantum electromagnetic field /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16777.pdf.
Full textChou, Kevin S. "Teleported operations between logical qubits in circuit quantum electrodynamics." Thesis, Yale University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10957321.
Full textA quantum computer has the potential to efficiently solve problems that are intractable for classical computers. Constructing a large-scale quantum processor, however, is challenging due to errors and noise inherent in real-world quantum systems. One approach to this challenge is to utilize modularity—a pervasive strategy found throughout nature and engineering—to build complex systems robustly. Such an approach manages complexity and uncertainty by assembling small, specialized components into a larger architecture. These considerations motivate the development of a quantum modular architecture, where separate quantum systems are combined via communication channels into a quantum network. In this architecture, an essential tool for universal quantum computation is the teleportation of an entangling quantum gate, a technique originally proposed in 1999 which, until now, has not been realized deterministically, Using the circuit quantum electrodynamics platform, this thesis reports on the experimental demonstration of a teleported controlled-NOT operation made deterministic by utilizing real-time adaptive control. Additionally, we take a crucial step towards implementing robust, error-correctable modules by enacting the gate between logical qubits, encoding quantum information redundantly in the states of superconducting cavities. Such teleported operations have significant implications for fault-tolerant quantum computation, and when realized within a network can have broad applications in quantum communication, metrology, and simulations. Our results illustrate a compelling approach for implementing multi-qubit operations on logical qubits within an error-protected quantum modular architecture.
Nissen, Felix Beat Fabian. "Effects of dissipation on collective behaviour in circuit quantum electrodynamics." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648225.
Full textTignone, Edoardo. "Cavity quantum electrodynamics : from photonic crystals to Rydberg atoms." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF008/document.
Full textIn the first chapter of this thesis, we study a quasiperiodic array of dielectric membranes inside a high-finesse Fabry-Pérot cavity. We work within the framework of the transfer matrix formal- ism. We show that, in a transmissive regime, the introduction of a quadratic spatial defect in the membrane positions enhances both the linear and quadratic optomechanical couplings between optical and mechanical degrees of freedom. Finally, we propose a theoretical model to simulate a one-dimensional quasiperiodic photonic crystal. In the second chapter of this thesis, we consider the problem of the transport of an exciton through a one-dimensional chain of two-level systems. We embed the chain of emitters in a transverse optical cavity and we show that, in the strong coupling regime, a ultrafast ballistic transport of the exciton is possible via the polaritonic modes rather than ordinary hopping. Due to the hybrid nature of polaritons, the transport efficiency is particularly robust against disorder and imperfections in the system. In the third chapter of this thesis, we consider an ordered array of cold atoms trapped in an optical lattice inside a hollow-core photonic crystal fiber. We study photon-photon interactions mediated by hard-core repulsion between excitons. We show that, in spite of underlying repulsive interac- tion, photons in the scattering states demonstrate bunching, which can be controlled by tuning the interatomic separation. We interpret this bunching as the result of scattering due to the mismatch of the quantization volumes for excitons and photons, and discuss the dependence of the effect on experimentally relevant parameters. In the fourth chapter of the thesis, we extend the results of the previous chapter to Rydberg atoms
Dutra, Sergio Mendes. "Generation and detection of fields in cavity quantum electrodynamics." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307569.
Full textTwining, Carole Janet. "A study of lattice quantum electrodynamics in three dimensions." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316545.
Full textWu, Shin-Tza. "Quantum electrodynamics in front of a dielectric half-space." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624491.
Full textWilson, Nicholas. "Dyson-Schwinger equations in quantum electrodynamics at finite temperature." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10015.
Full textReid, Benjamin P. L. "Towards cavity quantum electrodynamics and coherent control with single InGaN/GaN quantum dots." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:a8d84318-36a8-455f-a2fa-7fb9c4c738a0.
Full textWu, Zhengwei. "Quantum Corrections for Fundamental Plasma Behaviors." Thesis, The University of Sydney, 2009. https://hdl.handle.net/2123/29229.
Full textRaji, Rufai Odutayo. "Nonlinear low frequency wave phenomena in space plasmas." Thesis, University of the Western Cape, 2013. http://hdl.handle.net/11394/4036.
Full textIn this thesis, using multispecies fluid plasma models, nonlinear electrostatic solitary wave fluctuations will be investigated in magnetized plasmas. The different models used for the investigation will be guided by the satellite observations in different regions of the Earth magnetosphere. These investigations will enable us to attempt theoretical explanations for the nonlinear potential structures observed in the satellite data. Multispecies plasma consisting of cool and hot electrons with Maxwellian distributions and fluid ions will be considered to study low frequency solitons. The ions will be considered as magnetized. The study will be extended to include magnetized oxygen ions. The model will be modified for regions of the magnetosphere consisting of two ions having Maxwellian distributions and magnetized electrons. The nonthermal distributions of energetic hot electrons and the Maxwellian distributions of cool electrons with magnetized cold ions fluid will also be considered. For all the models, the effect of ion and electron densities, temperatures, magnetic field strength and propagation angle will be studied during the investigation of soliton structures. In all the above mentioned studies, arbitrary amplitude theory is carried out by the Sagdeev pseudo-potential method. Further investigations on the charateristics and existence domains of the solitons is found both analytically and numerically, using satellite data where applicable
Jenkins, Stewart David. "Theory of light -atomic ensemble interactions entanglement, storage, and retrieval /." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-09252006-175848/.
Full textKennedy, T. A. Brian, Committee Chair ; Kuzmich, Alex, Committee Member ; Chapman, Michael S., Committee Member ; Raman, Chandra, Committee Member ; Morley, Thomas D., Committee Member.
Hoffmann, Norah M. [Verfasser], and Ludwig [Akademischer Betreuer] Mathey. "Mixed Quantum-Classical Dynamics in Cavity Quantum Electrodynamics / Norah M. Hoffmann ; Betreuer: Ludwig Mathey." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1218707240/34.
Full textWaugh, Robert George. "Measurement of event shape variables in deep inelastic scattering." Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301504.
Full textGreiner, Christoph M. "Accelerated superradiance and pulse area quantization in atom-cavity systems /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3045087.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 171-178). Also available for download via the World Wide Web; free to University of Oregon users.
Dumur, Etienne. "A V-shape superconducting artificial atom for circuit quantum electrodynamics." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY003/document.
Full textThis thesis focuses on the experimental realisation of an artificial atom with a V-shape energy level diagram.Inspired by trapped-ion experiments, we theoretically predict an ultra fast and high fidelity quantum nondestructive readout of qubit state by using the V-shape artificial atom in a circuit quantum electrodynamicsarchitecture.To realise this experiment, we have developed an experimental setup to perform transmission measurementsof our superconducting quantum circuits by heterodyne technique at very low temperatures (30mK) and verylow signal amplitude (fW). We also implemented a hardware and software environment enabling multi-tonespectroscopies and time-resolved measurements in order to control the quantum state of the artificial atomand the coherent field in the resonator. In addition, in order to optimise the experiment circuits we havecharacterised quarterwave microwave resonators made from aluminium and epitaxial rhenium thin films.The original quantum device is fabricated by two inductively coupled transmons. When the couplinginductance is of the order of the Josephson inductance, we observe “in-phase” and “out-of-phase” oscillatingmodes of the superconducting phase across the junctions. The energy spectrum of the system, measured bytwo-tone spectroscopy, is magnetic flux dependent. It is precisely described by our theoretical model leadingto an accurate determination of the circuit parameters. Because of their anharmonicity, in the low-energylimit, the two modes can be considered as two-level systems called qubits. At zero magnetic field, it hasbeen observed that the two qubits become coupled only by a cross-anharmonicity. This has been revealed,through three-tone spectroscopy, by a conditional frequency shift as large as 115MHz of one qubit transitiondepending on the other qubit state. All these experimental results demonstrate a V-shape energy diagram forour artificial atom which paves the way to an original and high performance read-out
Howie, David John Henry. "Measurement of 1s2s '3Sâ†1-1s2p '3Pâ†2â†,â†0 transitions in heliumlike silicon, phosphorus, and sulphur." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239310.
Full textMcClelland, Anthony Francis. "Development of a novel technique for the measurement of the 1sâ†1â†/â†2 Lamb shift in high Z hydrogenic ions by Lyman #alpha#/Balmer #beta# wavelength intercomparison." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314909.
Full textChantler, Christopher Thomas. "Beam-foil spectroscopy of highly-ionized atoms, precision measurements of hydrogenic Lamb shifts and x-ray diffraction of curved crystals." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276810.
Full textBalkwill, C. "A study of the reactions e'+e'- #-># #mu#'+ #mu#'- and e'+e'- #-># #tau#'+ #tau#'- at centre of mass energies between 35 and 47 GeV." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233471.
Full textQuiney, H. M. "Finite basis set studies of the Dirac equation." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379934.
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