Dissertations / Theses on the topic 'Nonclassical states of light'
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Achilles, Daryl. "Generation and characterisation of multiphoton nonclassical states of light." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442123.
Full textBaune, Christoph [Verfasser]. "Frequency up-conversion of nonclassical states of light / Christoph Baune." Hannover : Technische Informationsbibliothek (TIB), 2016. http://d-nb.info/111695611X/34.
Full textThomsen, Laura Kathrine Wehde, and n/a. "Using Quantum Feedback to Control Nonclassical Correlations in Light and Atoms." Griffith University. School of Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040406.124012.
Full textThomsen, Laura Kathrine Wehde. "Using Quantum Feedback to Control Nonclassical Correlations in Light and Atoms." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367297.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
Full Text
Fedortchenko, Sergueï. "The ultrastrong coupling regime as a resource for the generation of nonclassical states of light." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC279/document.
Full textSince the advent of quantum mechanics, the study of light-matter interactions at thequantum level has been greatly developed as a research field. For instance, surprisingtheoretical predictions gave rise to experiments with unprecedented interactionstrengths between matter, and terahertz and microwave radiations. These results correspondto the so-called ultrastrong coupling regime, that is reached when the interactionenergy becomes comparable to the typical energies of the light and matter when they arenot interacting. In this regime, intriguing properties can be found such as the presenceof photons even when no energy is given to the system. However, these photons cannot,a priori, be emitted from the system to the outside world in order to be measured andtherefore demonstrate these properties. In this thesis, we studied these intriguing properties and proposed several means toaccess them experimentally. We relied on several physical platforms which are goodcandidates for such studies, and for each one of these systems we devised a model thatcan evidence these properties one way or another. By doing so, we explored the linkbetween the ultrastrong coupling regime and the generation of nonclassical states oflight. Additionally, as an outlook we showed that the light-matter interactions in oneof these platforms could be used to design quantum communication protocols. On topof showing fundamental interest, our results fit in the line of developing applications forquantum technologies using different experimentally available systems
Lolli, Jared. "Quantum Measurement and Feedback Control of highly nonclassical Photonic States." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC223/document.
Full textIn recent years, the field of quantum optics has thrived thanks to the possibility of controlling light-matter interaction at the quantum level.This is relevant for the study of fundamental quantum phenomena, the generation of artificial quantum systems, and for quantum information applications.In particular, it has been possible to considerably increase the intensity of light-matter interaction and to shape the coupling of quantum systems to the environment, so to realise unconventional and highly nonclassical states.However, in order to exploit these quantum states for technological applications, the question of how to measure and control these systems is crucial.Our work is focused on proposing and exploring new protocols for the measurement and the control of quantum systems, in which strong interactions and peculiar symmetries lead to the generation of highly nonclassical states.The first situation that we consider is the ultrastrong coupling regime in cavity (circuit) quantum electrodynamics.In this regime, it becomes energetically favourable to have photons and atomic excitations in the ground state, that is no more represented by the standard vacuum.In particular, in case of parity symmetry, the ground state is given by a light-matter Schrödinger cat state.However, according to energy conservation, the photons contained in these exotic vacua are bound to the cavity, and cannot be emitted into the environment.This means that we can not explore and control them by simple photodetection.In our work we propose a protocol that is especially designed to overcome this issue.We show that we can infer the photonic properties of the ground state from the Lamb shift of an ancillary two-level system.Another class of systems in which the fundamental parity symmetry leads to very unconventional quantum states is given by two-photon driven-dissipative resonators.Thanks to the reservoir engineering, it is today possible to shape the interaction with the environment to stabilize the system in particularly interesting quantum states.When a resonator (an optical cavity) exchanges with the environment by pairs of photons, it has been possible to observe the presence of optical Schrödinger cat states in the transient dynamics of the system.However, the quantum correlations of these states quickly decays due to the unavoidable presence of one-photon dissipation.Protecting the system against this perturbation is the goal of the parity triggered feedback protocol that we present in this thesis
Milanović, Josip [Verfasser], and Gerd [Akademischer Betreuer] Leuchs. "Generation of Nonclassical Polarization States of Intense Light using PhotonicCrystal Fibers / Josip Milanovic. Betreuer: Gerd Leuchs." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2013. http://d-nb.info/1031317848/34.
Full textSouza, Douglas Delgado de 1987. "Informação quântica com estados coerentes comprimidos da luz." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276940.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Na primeira parte deste trabalho seguimos os estudos de Hirota e colaboradores e definimos quatro estados quase-Bell baseados em estados coerentes comprimidos da luz. Dois desses estados são maximamente emaranhados, enquanto o emaranhamento dos outros dois depende apenas da sobreposição entre os estados coerentes comprimidos que os compõem. A partir destes estados quase-Bell, definimos novos estados interpolados cujo emaranhamento é também governado por um parâmetro de interpolação adicional e estudamos algumas das propriedades destes estados (emaranhamento e eficiência energética). Por fim, usamos estes estados e definimos alguns estados de Werner, com os quais analisamos de forma simples uma possível influência de um ambiente dissipativo parametrizado pela probabilidade de o estado de Werner estar em sua forma emaranhada ou misturada. Para esta análise usamos os conceitos de separabilidade e emaranhamento. Na segunda parte estudamos a estimativa de fase quântica usando estados gaussianos puros (estados coerentes comprimidos). Iniciamos com a estimativa da fase introduzida por um operador unitário em cujo hamiltoniano está presente uma perturbação linear nos operadores de criação e aniquilação, além do operador de número de fótons responsável pela evolução de fase (perturbação linear unitária). Obtemos quais são os estados gaussianos ótimos para a estimativa desta fase e analisamos a optimalidade da detecção homódina. A seguir, consideramos o parâmetro de perturbação como uma variável aleatória que obedece a uma distribuição gaussiana de probabilidades (perturbação linear aleatória) e novamente obtemos os estados de sonda ótimos e analisamos a optimalidade da detecção homódina. Por fim, estudamos a estimativa de fase com perturbação linear unitária utilizando os estados quase-Bell interpolados definidos na primeira parte deste trabalho e verificamos que a utilização de emaranhamento permite uma melhor estimativa de fase para uma mesma energia disponível
Abstract: In the first part of this work we follow the studies of Hirota and collaborators and we define four quasi-Bell states based on squeezed coherent states of light. Two of these states are maximally entangled, while the entanglement of the other two depends only on the overlap between the squeezed coherent states that were combined. From these quasi-Bell states we define new interpolated states for which the entanglement is also governed by an additional interpolation parameter, and we study some of the properties of these states (entanglement and energy efficiency). Finally, we use these states to define some Werner states, which we use to study in a simple way the possible influence of some dissipative environment parameterized by the probability that the Werner state is entangled or mixed. For this analysis we use the concepts of separability and entanglement. In the second part, we study the quantum phase estimation using pure Gaussian states (squeezed coherent states). We begin with the estimation of the phase introduced by a unitary operator whose Hamiltonian also contains a disturbance that is linear in the creation and annihilation operators in addition to the photon number operator responsible for the phase evolution (unitary linear disturbance). We find what are the optimal Gaussian states for this phase estimation and we also analyze the optimality of the homodyne detection. Next, we consider the disturbance parameter to be a random variable submitted to a Gaussian distribution (random linear disturbance) and again we find what are the optimal probe states and analyze the optimality of the homodyne detection. Finally we study the phase estimation with unitary linear disturbance using the interpolated quasi-Bell states defined in the first part of this work and we verify that the use of entanglement leads to a better phase estimation for the same amount of available energy
Doutorado
Física
Doutor em Ciências
2011/00220-5
FAPESP
Soares, Antonio Augusto. "Manipulação de estados quânticos da luz via espelhos semi-transparentes." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277389.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Não informado
Abstract: Not informed
Mestrado
Física
Mestre em Física
Denker, Timo [Verfasser]. "High-precision metrology with high-frequency nonclassical light sources / Timo Denker." Hannover : Technische Informationsbibliothek (TIB), 2016. http://d-nb.info/1112948473/34.
Full textBurks, Sidney. "Towards a Quantum Memory for Nonclassical Light with Cold Atomic Ensembles." Paris 6, 2010. http://www.theses.fr/2010PA066380.
Full textElliott, Matthew. "Theory of nonclassical photonic states in driven-dissipative circuit quantum electrodynamics." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/841210/.
Full textKettler, Jan [Verfasser]. "Telecom-wavelength nonclassical light from single In(Ga)As quantum dots / Jan Kettler." München : Verlag Dr. Hut, 2017. http://d-nb.info/1128466880/34.
Full textKettler, Jan Ferdinand [Verfasser]. "Telecom-wavelength nonclassical light from single In(Ga)As quantum dots / Jan Kettler." München : Verlag Dr. Hut, 2017. http://d-nb.info/1128466880/34.
Full textMumba, Mambwe. "EFFECTS OF COUPLING BETWEEN CENTER OF MASS MOTION OF AN ATOM AND A CAVITY MODE: PHOTON STATISTICS AND WAVE-PARTICLE CORRELATIONS." Connect to this document online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1121433361.
Full textTitle from first page of PDF document. Document formatted into pages; contains [1], v, 296 p. : ill. Includes bibliographical references (p. 393-396).
Mehmet, Moritz [Verfasser]. "Squeezed light at 1064 nm and 1550 nm with a nonclassical noise suppression beyond 10 dB / Moritz Mehmet." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2012. http://d-nb.info/1022760688/34.
Full textBayraktaroglu, Baran. "Light-states in Conformal Field Theories." Thesis, Uppsala universitet, Teoretisk fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-442580.
Full textLyubomirsky, Ilya. "Quantum reality and squeezed states of light." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36431.
Full textIncludes bibliographical references (leaves 67-71).
by Ilya Lyubomirsky.
M.S.
Brisudova, Martina Maria. "QCD bound states in light-front Hamiltonian approach /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487942739806751.
Full textLaycock, Thomas Henry. "Creation and manipulation of quantum states of light and cold atoms using Rydberg states." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13800/.
Full textAshwood, Nicholas Ian. "The search for molecular cluster states in light nuclei." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288654.
Full textRick, James Jonathan. "Masters of Light and Flight/ ”This Most Republican Amalgamation”." W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1516639665.
Full textZhang, Jie. "Study of super-deformed #alpha#-cluster states in light nuclei." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294227.
Full textZheng, Zhan. "Two-photon--two-atom excitation with quantum multimode light states." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066589/document.
Full textTwo-photonÐtwo-atom (2P2A) excitation turns out to be an important test bench of quantum optical properties. In 2004, Muthukrishnan et al. announced a great enhancement of the transition at 2P2A resonance, when an entangled two-photon state, coming from a three-level cascade, interacts with two non-interacting atoms. Their conclusion: in some situations, entanglement can replace a real interaction Hamiltonian, reveals an important property related to entanglement. In this thesis, We study in detail the efficiency of various multimode two-photon states of light to induce the simultaneous excitation of two atoms of different kinds under 2P2A resonance condition. We find that several separable, correlated states, produced either by an atomic cascade or parametric down-conversion, or even appropriate combinations of coherent states, have comparable efficiencies as the photon state produced by an atomic cascade. We conclude that the true physical origin of the enhancement is the frequency anti-correlations, neither the temporal correlations, time ordering, nor entanglement. To present, we are not sure whether or not the enhancement is a quantum effect. We also studied: 1. the optimized 2P2A transition probability for a given photon spectrum; 2. the influence coming from finite lifetimes of the excited detecting atoms; 3. the 2P2A transition probability in the presence of atomic interaction
Cooper, Merlin Frederick Wilmot. "Measurement and manipulation of quantum states of travelling light fields." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:79164748-ebb3-48e2-b4d4-1a4766d29217.
Full textDhoot, Anoop Singh. "Optical probing of excited states in conjugated polymer devices." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/272179.
Full textDickinson, David B. ""Old blue light" the religious beliefs and military leadership of Stonewall Jackson /." Theological Research Exchange Network (TREN), 1997. http://www.tren.com.
Full textWolfgramm, Florian. "Atomic quantum metrology with narrowband entangled and squeezed states of light." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/98460.
Full textEl uso de la luz, en particular la luz láser es, en muchos casos, el método que permite realizar mediciones de la manera más sensible. No obstante, la mayor sensibilidad que se puede conseguir gracias a la luz láser como sistema de sondeo queda delimitada por el límite cuántico estándar (SQL). Visto que muchos instrumentos se están acercando a este límite fundamental, es crucial explorar formas de superar el SQL. La metrología cuántica ofrece la posibilidad de incrementar la sensibilidad de las medidas más precisas más allá del SQL empleando los estados cuánticos de luz como herramienta. Dos categorías conocidas de estados cuánticos que brindan una ventaja metrológica y rompen con el SQL son los estados “comprimidos” y ciertas categorías de estados entrelazados llamados estados “NOON”. Aunque es de especial interés aplicar estos estados cuánticos a los sistemas atómicos, como a los vapores atómicos, se requieren estados cuánticos de óptima calidad en términos de pureza, fidelidad, luminosidad e identidad. Lo más importante para los sistemas atómicos de investigación es que los estados cuánticos sean de banda extremadamente estrecha para que coincidan con el ancho de banda de átomos. Puesto que los estados NOON suelen ser generados en un proceso de conversión espontánea paramétrica descendente (SPDC) de banda ancha, no son compatibles con las resonancias atómicas de banda estrecha. El objeto de esta tesis fue la generación de estados cuánticos de luz apropiados de banda estrecha, entrelazados y comprimidos, y su aplicación en los sistemas atómicos. Para incrementar el número de fotones generados por SPDC resonantes con la transición atómica por órdenes de magnitud, se empleó un sistema aumentado por un resonador. Se crearon estados de polarización comprimida y estados NOON de polarización entrelazada. La luminosidad espectral de los estados NOON generada supone una de las más altas que se hayan reportado hasta el momento entre pares de fotones idénticos. Los pares de fotones fueron cuidadosamente caracterizados por medio de una tomografía completa del estado cuántico que muestra la gran fidelidad con un estado NOON perfecto. Después de filtrar la producción de la fuente de fotones por medio de un novedoso filtro basado en el esquema “interaction-free measurement”, una medida de correlación cruzada demostró su potencial como fuente de fotones individuales anunciados de banda estrecha que resulta necesaria, por ejemplo, en la información cuántica. Para aplicar estos estados en un esquema de metrología cuántica y demostrar la ventaja metrológica, elegimos un magnetómetro atómico como sistema modelo. El montaje del magnetómetro delimitado por el límite cuántico estándar se basa en el efecto Faraday en un vapor de átomos de rubidio calientes. Se podía demostrar que el comportamiento de ambos estados cuánticos es superior en la aplicación con el magnetómetro que cualquier estado clásico, es decir, que superan el SQL. En el caso de los estados NOON, este es el primer uso de la coherencia multifotónica en un experimento atómico. Además de las aplicaciones en la metrología cuántica, las técnicas presentadas de generación de luz cuántica y filtración también son directamente aplicables a las tareas de información cuántica, en especial al uso en las memorias cuánticas.
Rey, Diana. "A Gasoline Demand Model for the United States Light Vehicle Fleet." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2351.
Full textM.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering MS
McDonnell, Joel W. "The electric light and the future: American perceptions and expectations, 1879-1890." Thesis, University of Ottawa (Canada), 1997. http://hdl.handle.net/10393/4314.
Full textKokalova, Tzanka T. "Gamma-ray spectroscopy of deformed states in light nuclei and cluster emission." [S.l.] : [s.n.], 2004. http://www.diss.fu-berlin.de/2004/21/index.html.
Full textLucivero, Vito Giovanni. "Quantum metrology with high-density atomic vapors and squeezed states of light." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/403962.
Full textHoy en día existe un considerable progreso en la magnetometría óptica y espectroscopía de ruido de espin, que utilizan conjuntos atómicos magnéticamente sensibles y lectura óptica, acercándose a los límites establecidos por la mecánica cuántica. En los últimos años los magnetómetros ópticos se han convertido en los instrumentos más sensibles para medir los campos magnéticos de baja frecuencia, logrando sensibilidad de sub-femtotesla y superando dispositivos como los superconductores de interferencia cuántica (SQUID), y han encontrado aplicaciones en biomedicina, geofísica, ciencia espacial, así como en varias pruebas de física fundamental. Otra técnica emergente es la espectroscopía de ruido de espin (SNS), que permite determinar las propiedades físicas de un sistema de espin sin perturbarlo por medio de su espectro de potencia de ruido. En la última década, los avances tecnológicos como analizadores de espectro en tiempo real y detectores limitados por el ruido de disparo de fotón han permitido mejoras en la sensibilidad de detección de ruido de spin que conduce a una amplia gama de aplicaciones tanto en la física del estado sólido como en la física atómica. El objetivo principal de esta tesis es responder a una cuestión pendiente e importante: si la "luz comprimida" puede mejorar la sensibilidad de los sensores atómicos en condiciones óptimas para la sensibilidad, típicamente en un régimen de alta densidad debido a la ventaja estadística de utilizar más átomos. En primer lugar, se describe el diseño, construcción y caracterización de un nuevo aparato experimental versátil para el estudio de la espectroscopia atómica con luz comprimida dentro de un régimen de alta densidad (n=¿10¿^12 ¿cm¿^(-3)) y bajo nivel de ruido magnético (¿pT/vHz). El nuevo sistema experimental se combina con una fuente existente de luz comprimida en polarización, basado en el proceso de conversión paramétrica espontánea descendente (SPDC) en un cristal no lineal, que es el medio activo de un oscilador paramétrico óptico. En segundo lugar, se presenta la primera demostración experimental de espectroscopía de espin de Rubidio, en abundancia natural, mejorada a través de la compresión en polarización de la luz de prueba. Se encontró que la entrada de 3.0 dB de luz comprimida mejora la relación señal-ruido de 1.5 dB a 2.6 dB en el intervalo combinado (potencia óptica)¿(densidad atómica) de (0.5 mW to 4.0 mW) ¿ (1.5׿10¿^12 ¿cm¿^(-3) to 1.3׿10¿^13 ¿cm¿^(-3)), que cubre rangos utilizados en los experimentos optimizados de espectroscopía de ruido de espin. También mostramos que la luz comprimida mejora el equilibrio entre la sensibilidad estadística y efectos de ampliación de la resonancia. A continuación, se introduce un nuevo modelo teórico con la definición de un límite cuántico estándar (SQL) para la espectroscopía de ruido detectado ópticamente, identificado como un límite a la covarianza de los parámetros estimados mediante el ajuste de los espectros de potencia de ruido. Probamos el modelo para la espectroscopia de ruido de espin en abundancia natural de rubidio y demostramos el rendimiento experimental de la espectroscopia de ruido al límite cuántico estándar para una haz coherente y por debajo del SQL para una haz de luz comprimida en polarización. Por último, se presenta un magnetómetro óptico basado en rotación óptica modulada en amplitud (AMOR), utilizando una celda de vapor de 85Rb, que logra sensibilidad a la temperatura ambiente de 70 fT/vHz a 7.6 µT y demostramos su limite de ruido de disparo de fotón (SNL) en el intervalo de 5 µT a 75 µT. Si bien no se utilizaron recursos cuánticos de la luz en este segundo experimento, la combinación de la mejor sensibilidad, en la clase de los magnetómetros escalares de temperatura ambiente, y con operación al limite de ruido de disparo hace que el sistema sea un candidato prometedor para la aplicación de luz comprimida a un magnetómetro óptico optimizado con mejor sensibilidad en la clase
Parker, Ryan Charles. "A loss resilient entanglement swapping protocol using non-classical states of light." Thesis, University of York, 2018. http://etheses.whiterose.ac.uk/22822/.
Full textWu, Di Ph D. Massachusetts Institute of Technology. "Spatiotemporal lifecycle assessment of the light-duty vehicle fleet of United States." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120265.
Full textCataloged from PDF version of thesis.
Includes bibliographical references.
Greenhouse gas (GHG) emission generated by vehicular transportation is one of the most significant challenges facing the world. Automotive manufacturers are actively pursuing technological solutions, such as electrification and light-weighting, to mitigate the emission burdens. However, it remains challenging to understand the actual emission payoff of these technologies, since the real-world driving context and characteristics vary greatly. The recent rapid growth of a new mobility behavior, ride-hailing, has also raised important questions for urban transportation and sustainability, largely because the net environmental impact of ride-hailing services is similarly challenging to assess. In this dissertation, I develop techniques aimed at treating these complex, context-dependent assessment challenges and address two questions: 1) What is the cost optimal technology portfolio required to achieve the environmental targets for the light-duty vehicle fleets? 2) How do the emerging ride-hailing services influence the carbon footprints of light-duty vehicles? This thesis presents my work on the first regionally explicit (county-level) lifecycle assessment of two technologies directed at mitigating the GHG emissions of light-duty vehicles in the U.S. - lightweighting and electrification. Regional differences in climate, electric grid mix, and driving patterns compound to produce a significant regional heterogeneity in the GHG benefits of electrification. We show that lightweighting further accentuates these regional differences. I then expand the scope to incorporate the dynamic evolution of the light-duty vehicle fleets. Through evaluating the lifecycle emission and ownership cost, I identify the most cost-effective technology portfolios of the county-level vehicle fleets that meet specified environmental targets (as the fleet evolves over time/over the course of fleet evolution?). Finally, to tackle the second question of changing modes of vehicle use, I developed the first elaborate, systematic and data-centric study on the environmental sustainability of ride-hailing in major American cities. Through the use of increasingly available large datasets describing vehicle trips within urban areas, I demonstrated that, while ride-sharing leads to positive environmental impacts, the rebound arising from shifts away from mass transit toward ride-hailing engenders substantial negative impact. Results show that the environmental impacts of ride-hailing are strong functions of urban context and vehicle technology, and ride-hailing is unlikely to achieve net environmental benefits without regulatory intervention. These findings fill an important gap in people's understanding of the advanced automotive technologies and the emerging mobility behavior from sustainability perspective, and shed light on the recent upheaval that vehicular transportation has caused across the United States.
by Di Wu.
Ph. D.
Kocsis, Alexander (Sacha) Julien. "Controlling Non-Classical States of Light: Experimental Techniques in Quantum Information Science." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/367240.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Physical Sciences
Science, Environment, Engineering and Technology
Full Text
Bora, Vaibhav Joga Singh. "Photon Statistics in Scintillation Crystals." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/577317.
Full textAst, Stefan [Verfasser]. "New approaches in squeezed light generation : quantum states of light with GHz squeezing bandwidth and squeezed light generation via the cascaded Kerr effect / Stefan Ast." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://d-nb.info/1072062666/34.
Full textFarrera, Soler Pau. "A versatile source of light-matter quantum states based on laser-cooled atoms." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/663094.
Full textLa informació quàntica estudia situacions en les que la informació està codificada en estats quàntics. Aquesta codificació és afectada per efectes de la fisca quàntica (com ara superposició o entrellaçament) i el seu estudi ha portat a descobriments i noves aplicacions fascinants. Uns sistemes interessants dins d'aquest camp son les interfícies quàntiques de llum-matèria, les quals interconnecten estats quàntics codificats en llum i en matèria. Aquests sistemes combinen els avantatges dels estats fotònics (bona transmissió a llarga distància) amb els dels estats en matèria (bon emmagatzematge i processament). L'objectiu principal de la tesis era desenvolupar una interfície llum-matèria quàntica que pogués distribuir l'estat fotònic a altres interfícies basades en altres plataformes. Aquesta versatilitat podria obrir noves possibilitats que combinen els avantatges de les diferents plataformes. En aquesta tesis hem estudiat les dificultats que apareixen en aquestes connexions híbrides i hem realitzat dos exemples d'aquestes connexions. La nostra interfície llum-matèria quàntica està basada en un núvol d'àtoms de Rubidi que estan refredats en una trampa magneto-òptica. Operem aquest sistema atòmic utilitzant l'esquema Duan-Lukin-Cirac-Zoller per tal de generar parelles que consisteixen en un fotó individual i una excitació atòmica d'espín col·lectiva (anomenada ona-d'espín). Nosaltres utilitzem aquest esquema per tal de generar diferents tipus d'estats quàntics, com ara fotons individuals o qubits fotònics, estats correlacionats de fotó-fotó o entrellaçament entre qubits fotònics i atòmics. Primerament vam estudiar dues capacitats que es necessiten per tal de fer possible les connexions híbrides mencionades: la flexibilitat de la freqüència i el perfil temporal dels estats fotònics. En el primer vam estudiar la conversió de la freqüència dels fotons individuals aparellats amb ones-d'espín en el medi atòmic. Vam poder convertir la seva longitud d'ona de 780nm a 1552nm utilitzant una guia d'ones amb un cristall no-lineal. En el segon vam mostrar la flexibilitat en la duració temporal de fotons individuals amb duracions que van de 10 ns a 10 ns. Les propietats estudiades dels fotons indiquen que el seu espectre està limitat per la transformada de Fourier, la qual cosa permet la flexibilitat del seu espectre. En el tercer treball vam estudiar la generació d'un estat entrellaçat entre llum i matèria en el que l'estat fotònic està codificat en un time-bin qubit. Dos ingredients claus van permetre aquest experiment: un desfasament atòmic induït per un camp magnètic que permet crear ones-d’espín en dos modes temporals distingibles, i interferòmetres de Mach-Zehnder que van permetre l’anàlisi dels qubits. La codificació fotònica de time-bin té els avantatges de baixa decoherència en fibres òptiques i una compatibilitat directa per efectuar conversió de freqüència. Finalment, vam aprofitar aquestes capacitats estudiades per tal de transferir estats quàntics fotònics cap a dos tipus diferents d'interfícies llum matèria. La primera va ser una altre núvol fred d’àtoms de Rubidi en el que és possible transferir fotons individuals cap a excitacions de Rydberg. Aquest experiment representa el primer pas per a futurs estudis d'efectes quàntics no-lineals utilitzant les interaccions Rydberg de llarga distància. Els segon va ser un cristall dopat amb ions de Praseodimi. En aquest treball la transferència de l'estat quàntic va passar entre sistemes amb diferents espècies atòmiques, sent un veritable exemple híbrid fet possible per la conversió de freqüència quàntica. Aquests resultats mostren una interfície llum-matèria quàntica en la que les propietats dels estats fotònics poden ser optimitzades per obtenir una interacció òptima amb altres plataformes materials. Les transferències fotòniques d'estats quàntics als sistemes de Rydberg i de cristalls obren la porta a l'estudi de nous experiments que combinin els avantatges de les diferents plataformes.
DiGuglielmo, James [Verfasser]. "On the experimental generation and characterization of entangled states of light / James DiGuglielmo." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1008525707/34.
Full textArndt, Daniel. "Light-Cone Quark Model Analysis ofPseudoscalar and Vector Mesons for Radially Excited States." NCSU, 1999. http://www.lib.ncsu.edu/theses/available/etd-19990518-132243.
Full textWe present a relativistic constituent quark model to analyze the mass spectrum and hadronic properties of radially excited u and d quark sector mesons.Using a simple Gaussian function as a trial wave function for the variational principle togetherwith a QCD motivated Hamiltonian, including not only the Coulomb and confiningpotential but also a relativistic corrected hyperfine interaction term, we obtain the mass spectrum consistent with the experimental data. To do the same for several observables such as decay constants and form factors it seems necessary to include bothDirac and Pauli form factors on the level of constituentquarks. Taking into account these quark form factorswe thus present the generalized formulas for the rho mesondecay constant and the rho meson form factors as well asthe $\pi\gamma$ transition form factor.We alsopredict several hadronic properties for the radiallyexcited states.
Fearnside, Andrew Simon. "Dressed autoionising states and light-induced continuum structures in an intense laser field." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5225/.
Full textGavin, Elizabeth Jane Ogle. "Bound states of heavy and light quarks in the framework of quantum chromodynamics." Master's thesis, University of Cape Town, 1985. http://hdl.handle.net/11427/14576.
Full textThe spectra of the D, F, B and E mesons have been calculated using the MIT bag model together with a static potential related to the Fourier transform of the "dressed" gluon propagator. The heavy quark has been assumed to coincide with the centre of the bag, while the Light antiquark was treated relativistically using the Dirac equation. The spectra obtained are compared with experimental data as well as with the results of other models of these Qq mesons. The ratio mb/mc obtained in the fit to experimentally known states is compared with the result expected from the hyperfine splitting of the D and B mesons. It appears that tris ratio is model dependent. More experimental data are required to further evaluate the validity of this model.
Suess, C. J. "Quantum chemical calculations of the excited states of porphyrins." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/48422/.
Full textDodd, Thomas G. "Development of a three dimensional terrain display for a light infantry platoon combat model." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA247994.
Full textThesis Advisor(s): Parry, Samuel H. Second Reader: Hoffman, James C. "June 1990." Description based on signature page as viewed on October 21, 2009. Page 21 is missing and not attainable. DTIC Identifier(s): Combat models. Author(s) subject terms: Three dimensional graphics display, combat model, DYNTACS terrain representation. Includes bibliographical references (p. 134-135). Also available online.
Tesfamariam, Alem Mebrahtu. "Fluctuations in quantum optical systems from Bose-Einstein condensates to squeezed states of light /." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=983242283.
Full textLemieux, Samuel. "Tailoring the Modal Structure of Bright Squeezed Vacuum States of Light via Selective Amplification." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34920.
Full textZhen, Bo Ph D. Massachusetts Institute of Technology. "Optical bound states in the radiation continuum : from topological charges to light-emission applications." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95849.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 83-89).
Bound states in the continuum (BICs) are unusual solutions of wave equations describing light or matter: they are discrete and spatially bounded, but exist at the same energy as a continuum of states which propagate to infinity. In this thesis, we will explore optical BICs from different perspectives, including physical intuitions, fundamental theories, sample fabrications, experimental setups, and real-life applications. First, we demonstrate the existence of such exceptions realized in macroscopic two dimensional periodic photonic crystals slab. The reason for these special modes to completely decouple from the continuum of free-space modes is through mismatching their symmetries. Further, we distinguish these special non-degenerate states with quality factors as high as 10' that extend over 108 unit cells from other existing modes in the system. Then, we show BICs have profound implications in light-emission applications. When coupling these special states to emitters, we demonstrate greatly enhanced and strongly modulated spontaneous emission from organic molecules, due to the unique properties of BICs. Furthermore, these BICs enable lasing of organic molecules with threshold at least one order of magnitude lower than previous reported results. Third, we demonstrate a different kind of BICs: those are not protected by symmetry incompatibility. We experimentally demonstrate that light can be perfectly confined in a patterned dielectric slab, even though outgoing waves (symmetry compatible) are allowed in the surrounding medium. Such states exist stably in a general class of geometries where all of its radiation amplitudes vanish simultaneously due to destructive interference. Finally, we provide a fundamental understanding about the nature of BICs that unify both types of BICs. We also explain the robustness of them through their topological nature. We show that both types of BICs are vortex centers in the polarization direction of far-field radiation. The robustness of these BICs is due to the existence of conserved and quantized topological charges, defined by the winding number of the polarization vectors. Such charges can only be generated or annihilated by making large changes in the system parameters, and then only according to strict rules, which we derive and test numerically.
by Bo Zhen.
Ph. D.
Arndt, Daniel. "Light-cone quark model analysis of pseudoscalar and vector mesons for radially excited states." Raleigh, NC : North Carolina State University, 1999. http://www.lib.ncsu.edu/etd/public/etd-3522131849921371/etd.pdf.
Full textMcGuinness, Hayden James 1980. "The creation and frequency translation of single-photon states of light in optical fiber." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11259.
Full textWe explore the frequency translation of single-photon states of light and the creation of photon pairs by four-wave mixing in optical fiber. Frequency translation refers to changing the central frequency of a field, while photon pair creation refers to the creation of two individual photons at the same time. We demonstrate these effects in third-order nonlinear optical fiber. While both phenomena have previously been shown by three-wave mixing in second-order nonlinear media, there are compelling reasons to develop these tasks in third-order media. Most importantly, frequency translation in third-order material allows for the practical implementation of both small and large frequency shifts, while second-order material only practically allows for large shifts. Photon creation in third-order media often permits more flexible phase-matching conditions, allowing for the creation of a wider variety of quantum states than is often possible in second-order media. In our theoretical study of photon pair creation, we focus on the spectral correlations of the photon pairs. We pay particular attention to the creation of quantum states of high purity, where the photons are not spectrally correlated with one another. High purity photons are a requisite resource for several different quantum information processing applications, such as linear-optical quantum computing. We find that states with high purity can be realized with a minimal amount of spectral filtering. Experimentally, we study photon frequency translation in photonic crystal fiber. The central wavelength of the input photons was translated from 683 nm to 659 nm. We perform second-order intensity correlation measurements on both channels to demonstrate their quantum nature. This resulted in values of 0.21 ± 0.02 and 0.19 ± 0.05 for the 683-nm and 659-nm channels, respectively, demonstrating that those fields were dominated by their single-photon component. The efficiency at which the process occurred was 29 percent. Theoretically, we develop a Green function formalism to describe the translation process and develop a computational model to calculate the solution to the governing equations. Also, in a related experiment, we demonstrate classical frequency translation from 851 nm to 641 nm, a record translation in both wavelength and frequency, at an efficiency of 0.2 percent in a birefringent fiber.
Committee in charge: Dr. Daniel Steck, Chair; Dr. Michael Raymer, Advisor; Dr. Steven van Enk, Inside Member; Dr. Raghuveer Parthasarathy, Inside Member; Dr. Andrew Marcus, Outside Member
Cooke, Jason Randolph. "Light front field theory calculation of deuteron properties /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/9662.
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