Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 78 for “"QeD"”.
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Qed in periodischen und absorbierenden Medien
Das Strahlungsfeld in einem absorbierenden, periodischen Dielektrikum ist kanonisch quantisiert worden. Dabei wurde ein eindimensionales Modell mit punktförmigen Streuern betrachtet, deren Polarisierbarkeit den Kramers-Kronig Relationen gehorcht. Es wurde ein Quantisierungsverfahren nach Knöll, …
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A QED framework for nonlinear and singular optics
The theory of quantum electrodynamics is employed in the description of linear and nonlinear optical effects. We study the effects of using a two energy level approximation in simplifying expressions obtained from perturbation theory, equivalent to truncating the completeness relation. However, …
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The QED beta-Function: A First Principles Derivation
Quantum electrodynamics (QED) is a quantum-relativistic theory for electromagnetism. It is among the most successful quantum field theories, which collectively describe the dynamics of elementary particles at high energies. Unfortunately, the dynamical expressions for interacting theories do not …
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Dimensionally Regulated On-Shell Renormalisation In QCD And QED
… of massive fermion two-loop calculations in QED and QCD, which allows us to reduce complicated on-shell Feynman integrals to a large number of simple integrals, and one particularly complicated, but evaluable, one. The method extends the work of Chetyrkin and Tkachov to massive integrals, and …
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Isospin Violating Hadronic Mass Splittings using Lattice QCD+QED
… (QCD) and quantum electrodynamics (QED), which reveal an even deeper layer of structure than the atom and the nucleon. We use the non-perturbative method of lattice QCD+QED to make precision estimates of the masses and mass splittings of the light ground state hadron spectrum, …
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Nonlinear Optics Quantum Computation and Quantum Simulation with Circuit-QED
Superconducting quantum circuits are a promising approach for realizations of large scale quantum information processing and quantum simulations. The Josephson junction, which forms the basis of superconducting circuits, is the only known nonlinear non-dissipative circuit element, and its inherent …
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Cavity QED with superconductors and its application to the Casimir effect
Diese Diplomarbeit untersucht den Casimir-Effekt zwischen normal- und supraleitenden Platten über einen weiten Temperaturbereich, sowie die Casimir-Polder-Wechselwirkung zwischen einem Atom und einer solchen Oberfläche. Hierzu wurden vorwiegend numerische und asymptotische Rechnungen durchgeführt. …
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Contribution to Entanglement Theory, Applications in Atomic Systems and Cavity QED
… of blockade and transparency in such cavity QED systems.
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Multiple thresholds and many-atom dynamics in the cavity QED microlaser
This thesis describes a study of a cavity QED microlaser in which many atoms are present simultaneously and atom-cavity interaction is well-defined. The microlaser is found to display multiple thresholds analogous to first-order phase transitions of the cavity field. Hysteresis is observed as a …
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MAJORANA FERMION IN TOPOLOGICAL SUPERCONDUCTOR AND MOTT‐SUPERFLUID TRANSITION IN CIRCUIT‐QED SYSTEM
The thesis contains two parts. In Part I, we study the Majorana fermion and its transport in the topological superconductors. In Chapter 2, we investigate the edge states and the vortex core states in the spin-singlet superconductor with Rashba and Dresselhaus (110) spin-orbit couplings. In Chapter …
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Solid state cavity QED : practical applications of strong coupling of light and matter
… temperature. Since the earliest days of cavity QED, there has been a major desire to construct solid state optical devices that operate in the limit where strong light-matter interactions dominate the dynamics. Such devices have been successfully constructed, but their operation is usually …
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Perturbation theory of two particle bound states in QED for particles of spin ��� 1
In this paper we present a generalization of Salpeter's approach to solving the Bethe-Salpeter equation for the hydrogen atom to the case of any two particles of spin ≤ 1. In order to preserve the same general form of Salpeter's scheme the Kemmer-Duffin equations are used to describe the spin 1 or …
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Quantum Trajectory Theory of Open Cavity-QED Systems with a Time Delayed Coherent Optical Feedback
… simulating cavity quantum electrodynamic (cavity-QED) systems with time-delayed coherent feedback. First, an explanation of QT theory is given and the related time discretized waveguide (TDW) model is derived. Next we present a model for feedback using the frequency modes of the waveguide and …
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Perturbation Theory of Two Particle Bound States in Qed for Particles of Spin l.e. 1
Made available in DSpace on 2015-05-12T22:38:46Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7212276.PDF: 1798069 bytes, checksum: 9fc3a98b6dcf1dd9e749159675c599cf (MD5) Previous issue date: 1971
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High-precision QED calculations of the hyperfine structure in hydrogen and transition rates in multicharged ions
… in few-electron ions within ab initio QED provide a most sensitive tool for probing the influence of relativistic electron-correlation and QED corrections to the transition rates. Accordingly, a major part of this thesis is devoted to detailed studies of radiative and …
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Many-body cavity QED: The Dicke model, phase transitions, and engineering of multipartite entangled atomic states
… atoms with integer spin - to many-body cavity QED. We showed that the Dicke model, and more simply a Tavis-Cummings model, acting on a particular state of spin-1 atoms produces highly entangled states heralded by measurement of the cavity output. In the context of interactions within the gas, …
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ADVANCEMENTS IN PDFS DETERMINATION: INCORPORATION OF QED EFFECTS AND NEW THEORETICAL IMPROVEMENTS IN A MODERN DEEP LEARNING FRAMEWORK
… are the inclusion of Quantum Electrodynamics (QED) corrections, the inclusion of the so-called missing higher orders uncertainties (MHOUs) and the inclusion of approximate next-to-next-to-next-to-leading order contributions (aN$^3$LO). This work aims to overcome the NNPDF4.0 PDFs determination, …
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Waveguide Quantum Electrodynamics with Superconducting Qubits
… of cavity quantum electrodynamics (QED), where atoms, either natural or artificial, are strongly coupled to the confined photonic modes of cavities. However, in recent years, achieving strong coupling between atoms and itinerant photons has also gained significant interest for its …
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