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 92 for “"quantum interference"”.
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Complementarity and uncertainty in quantum interference
… complementarity and uncertainty encountered in quantum mechanics. Its starting point is an assessment of how these concepts have been represented and illustrated by various writers dating back to their inception. Following the survey a coherent account of the connections and contrasts between …
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Theory of quantum interference in molecular junctions
… related to single molecule transport theory. Quantum interference effects have recently attracted great interest in studies of the charge transport at the single molecule scale. Within this framework, I study the single molecule conductances of five-membered ring compounds to investigate the …
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Quantum interference with undetected photons for sensing and imaging
Quantum interference with undetected photons has gained significant attention in the past ten years due to its potential to decouple the probing and the detection of an active sensing system. The technique is based on correlated photon pairs: one photon interacts with the analyte, and the signature …
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Microstrip Superconducting Quantum Interference Devices for Quantum Information Science
<p>Quantum-limited amplification in the microwave frequency range is of both practical and fundamental importance. The weak signals corresponding to single microwave photons require substantial amplification to resolve. When probing quantum excitations of the electromagnetic field, the substantial …
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Coherence, Dephasing, and Quantum Interference in Colloidal Perovskite Nanocrystals
As the development of photonic quantum technologies continues to be pushed forward, the need for a source of quantum light, the so-called quantum emitter, has been ever-growing. The requirements for a quantum emitter are onerous: indistinguishable photon or entangled photon pairs need to be …
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Quantum Interference Effects in Precision Spectroscopy of Helium Fine Structure
… helium, and at the current level of uncertainty, quantum interference can be a significant source of systematic error in measurements of the fine-structure intervals. This work deals with these quantum interference effects, which are due to coherent excitation of the atom to multiple neighbouring …
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A Study of Quantum Interference and Entanglement with Negative Optics
<p>Geometrically decorated two-dimensional (2D) discrete surfaces can be more effective than conventional smooth reflectors in managing wave radiation. Constructive non‐specular wave scattering permits the scattering angle (β) to be other than twice that of incidence (α). This result in gross …
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Quantum interference in the dielectronic recombination of heavy highly charged ions
Die Photorekombination hochgeladener Quecksilberionen wurde mittels einer Elektronenstrahlionenfalle (electron beam ion trap) experimentell untersucht. Ein Elektronenstrahl variabler Energie überstrich den Bereich 45-54 keV, in dem die KLL Resonanzen der Hg75+...78+ -Ionen liegen. Zum Nachweis der …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
The study of quantum interference in solid-state systems yields insight in fundamental properties of mesoscopic systems. Electron quantum interference constitutes an important method to explore mesoscopic physics and quantum decoherence. This dissertation focuses on two-dimensional (2D) electron …
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Two-Photon Quantum Interference Polarization Spectroscopy: Measurements of Transition Matrix Elements in Atomic Rubidium
… This is accomplished by means of the two-photon quantum interference polarization spectroscopy. A two-photon polarization spectrum of the rubidium atom is obtained in the range of detunings -417 cm<sup>-1</sup> to +99 cm<sup>-1</sup> from atomic 5s<sup>2</sup>S<sub>1/2</sub>-5p …
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Measurements of superconducting phase gradients by a nanowire quantum interference device templated by DNA molecules
… We have used these nanowires as the basis for a quantum interference device in which two wires are connected in parallel by superconducting films. We have discovered resistance oscillations for the two-wire device as a function of phase gradients in the leads caused by magnetic screening currents …
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High-quality source of fiber-coupled polarization-entangled photons at 1.56 [mu]m
… wavelength (1.56 [mu]m). A two-photon quantum interference visibility of 97.1% was measured. In addition to the Sagnac source, a linear Mach-Zehnder source at 810 nm was built for the Interdisciplinary Quantum Information Science and Engineering (iQuISE) teaching laboratory, to allow …
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Towards integrated silicon photonic architectures for quantum information processing
… is a highly-promising platform for on-chip quantum information processing. Linear optical quantum computing architectures necessitate the implementation of integrated single photon sources, passive and active optics, and single photon detectors. This thesis presents the development of a …
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Photon-induced vortex-antivortex pair creation in superconducting films
We have used a dc SQUID (Superconducting Quantum Interference Device) to study vortex-antivortex pair creation in both two-dimensional superconducting films and Josephson junction arrays in the presence of 850 nm light irradiation. Specifically the experiments aim to distinguish between the …
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Theory of electron and phonon transport in nano and molecular quantum devices : design strategies for molecular electronics and thermoelectricity
… sensing, new graphene-based molecular junctions, quantum interference rules and thermoelectricity (or thermal management). I demonstrate the discriminating sensing properties of new bilayer-graphene, sculpturene-based nano-pore devices for DNA sequencing. A unique and novel signal processing …
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Electromagnetic Modelling of Superconducting Sensor Designs
… of thin film direct current Superconducting QUantum Interference Device (SQUID) magnetometers made of YBCO (YBa2Cu3O7-x) was considered. The inductances and effective areas were calculated using the software package 3D-MLSI. Resolution and reliability issues were first tested on simple …
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Experimental determination of the symmetry of the superconducting pairing state in yttrium barium copper oxide
… bimetallic Pb-Au-YBCO dc SQUIDs (Superconducting QUantum Interference Devices) and Josephson junctions that provide an important clue to the origin of the pairing mechanism for high temperature superconductivity in the cuprates. By probing the momentum space anisotropy of the phase of the …
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Synthesis and Characterization of Magnetic II-VI Nanoparticles
… times were determined using a superconducting quantum interference device (SQUID) magnetometer.
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Microwave response of nonlinear oscillations in resistively shunted superconducting nanowires
… technologies such as rapid single flux quantum computing (RSFQ) and superconducting quantum interference devices (SQUIDs) rely on the modulation of nonlinear dynamics in Josephson junctions for functionality. More recently, however, superconducting devices have been developed based on …
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Electrical noise study of spin glass dynamics in mesocopic CuMn
… sensitivity results from long-range electron quantum interference at low temperatures. Due to this effect, substantial resistance noise is produced by spontaneous spin fluctuations below the spin-glass freezing transition. Described here are the results of noise experiments on extremely …
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