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 38 for “"quantum coherence"”.
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Aspects of Quantum Coherence
… our aim is to study several aspects related to quantum coherence as understood to correspond with the non-classical behaviour that can be observed for certain particular states of a physical system. In particular we are interested in the possible mechanisms that result in dynamically induced …
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Towards improving the quantum coherence in Ion microtraps
… number of applications in optical atomic clocks, quantum metrology and quantum information processing. Quantum coherence is essential in these applications, yet motional decoherence of ions remains a significant limitation. Experiments towards improving the quantum coherence of ions confined in …
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Quantum Coherence and Entanglement in Open Quantum Systems
… these mysteries in nature.</p> <p>Recently, quantum coherence and entanglement are believed to play a crucial role in such biological systems–avian compass and photosynthesis. Thus, nature might know more tricks to utilize quantum mechanics than humans. Studies on the mechanisms underlying …
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Quantum coherence and magnetism in bosonic and fermionic gases of ultracold atoms
… by Stoner. In the second part of the thesis, the coherence properties of a Bose-Einstein condensate (BEC) was studied in a radio frequency induced double-well potential implemented on a microfabricated atom chip. We observed phase coherence between the separated condensates for times up to 200 ms …
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Quantum Hall Tunnel Junctions: Luttinger Liquid Physics, Quantum Coherence Effect and Fractional Quantum Numbers
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-23T18:51:21Z No. of bitstreams: 1 Kim_EunAh.pdf: 1380167 bytes, checksum: ab1df1bef794c23bd5fbb9cd2183882e (MD5)
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Tunneling Systems in Condensed Phases: Quantum Dynamical Monte Carlo and Analytical Theories
… models for electron transfer and for the quantum coherence phenomenon in Josephson junctions. A dynamical correlation function for the latter shows a plateau indicative of the localization effects of damping.
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On-Chip Atomic Spectroscopy
… of optical applications, including the study of quantum coherence effects such as electromagnetically induced transparency and single-photon nonlinearities, as well as frequency stabilization standards. The use of hollow waveguides allows for light propagation in low index (vapor) media with …
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Quantum Transport of Electronic Excitations through Macromolecules
… of real-time dynamics of charged and neutral quantum excitation propagating through macromolecular systems is receiving growing attention due to its potentially countless applications in nano-scale (opto-)electronics and in biophysics. Several key issues have not been fully clarified yet, …
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Computational investigation of light harvesting in purple photosynthetic bacteria
… hierarchy equations of motion (HEOM) for open quantum systems, which does not rely on assumptions of relative interaction strengths and includes quantum coherence effects. An efficient implementation of the HEOM is developed and utilized to describe exciton dynamics in the light harvesting …
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Path-integral studies of quantum statistical effects in vibrational spectroscopy
We examine the role of nuclear quantum statistical effects in the vibrational spectroscopy of molecular systems at finite temperatures. Our starting point is Matsubara dynamics, which rigorously combines quantum Boltzmann statistics with classical real-time trajectories, by filtering out the …
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Quantum Resource Theories for Thermodynamics, Reference Frames, and Uncertainty
Quantum information science is at the interface of physics and information theory, with applications including quantum computing and communication. Within this science, a resource theory is a detailed study of a particular class of physical processes, under which the possible state transitions are …
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Quantum-coherent transport in low-dimensional mesoscopic structures and thin films
This thesis experimentally studies quantum interference phenomena and quantum coherence in mesoscopic systems, and quantum transport as well as magnetotransport in various materials system. One overarching aim is exploring the different mechanisms that give rise to quantum phase decoherence in …
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Electromagnetically Induced Transparency and electron spin dynamics using superconducting quantum circuits
… is an exploration on superconducting devices, quantum optics, and magnetic resonance. Superconductive quantum circuits (SQC) comprising mesoscopic Josephson junctions can exhibit quantum coherence amongst their macroscopically large degrees of freedom. They feature quantized flux and/or charge …
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Generalized entanglement in quantum information theory : optimization free measures and faithful extraction protocols
By studying generalizations of entanglement to quantum resource theories,we will provide a continuous family of optimization free measures to quantify the resource in a system, for any theory whose set of free states is given by the image of an idempotent and unital quantum operation. With the help …
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Microwave Spectroscopy and Transport Measurements of Andreev Bound States in Superconductor – Semiconductor Josephson Junctions
… is governed by a combination of the macroscopic quantum coherence of superconducting systems and the mesoscopic physics inherent to semiconducting devices and Andreev bound states are the microscopic states which mediate transport through these junctions. In this thesis a series of experiments …
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Investigation of Acrylated Alkyds
… sites, 2D gradient heteronuclear multiple quantum coherence Nuclear Magnetic Resonance (2D gHMQC NMR), 1H NMR, selective extraction, and gas chromatography were conducted to study each system. For the stearic alkyd model systems, evidence of grafting by hydrogen abstraction from glyceride …
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Two-dimensional Spectroscopy of Molecular Excitons in a Model Dimer System
… strength, to provide clear signatures for coherences between vibronic excitons in 2D spectra. We begin by describing the design of a broadband passively phase-stabilized interferometer for collection of 2D spectra, which also allows for the investigation of state preparation in 2D …
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Collective Phenomena in Excitonic Quantum Matter
… are expected to realise a rich phase diagram of quantum phases in- and out-of-equilibrium: a hypothesized pairing instability leads to the macroscopic condensation of “excitonic insulators” in small-bandgap materials, with quantum coherence and possible super-transport persisting up to room …
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The application of nuclear magnetic resonance in the structural elucidation of natural products
… assignment. The Heteronuclear Multiple Quantum Coherence (HMQC) experiment offered greater sensitivity on small sample quantities whilst the long range Heteronuclear Correlation (HETCOR) and Heteronuclear Multiple Bond Coherence (HMBC) experiments were essential for complete assignment …
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Approximations to Matsubara Dynamics for Vibrational Spectra
… of accurately and efficiently including nuclear quantum effects in vibrational spectra, with a particular focus on anharmonic dynamics and non-fundamental transitions. All the methods investigated are approximations to Matsubara dynamics, which is a rigorous theoretical framework that recovers …
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