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Tesi sul tema "Quantum optics Measurement"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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1

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.

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This thesis is concerned with the generation of non-classical quantum states of light, the photon-level manipulation of quantum states and the accurate tomography of both quantum states and quantum processes. In optics, quantum information can be encoded and processed in both discrete and continuous variables. Hybrid approaches combining for example homodyne detection with conditional state preparation and manipulation are gaining increasing prominence. The development and characterization of a time-domain balanced homodyne detector (BHD) is presented. The detector has a bandwidth of 80 MHz, a

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2

Pregnell, Kenneth Lyell, and n/a. "Retrodictive Quantum State Engineering." Griffith University. School of Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20041029.134933.

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This thesis is concerned with retrodiction and measurement in quantum optics. The latter of these two concepts is studied in particular form with a general optical multiport device, consisting of an arbitrary array of beam-splitters and phase-shifters. I show how such an apparatus generalizes the original projection synthesis technique, introduced as an in principle technique to measure the canonical phase distribution. Just as for the original projection synthesis, it is found that such a generalised device can synthesize any general projection onto a state in a finite dimensional Hilbert spa

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3

Kozlowski, Wojciech. "Competition between weak quantum measurement and many-body dynamics in ultracold bosonic gases." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:8da45dd9-27f9-42b6-8bae-8001d0154966.

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Trapping ultracold atoms in optical lattices enabled the study of strongly correlated phenomena in an environment that is far more controllable and tunable than what was possible in condensed matter. Here, we consider coupling these systems to quantised light where the quantum nature of both the optical and matter fields play equally important roles in order to push the boundaries of what is possible in ultracold atomic systems. We show that light can serve as a nondestructive probe of the quantum state of matter. By considering a global measurement we show that it is possible to distinguish a

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4

Elouard, Cyril. "Thermodynamics of quantum open systems : applications in quantum optics and optomechanics." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY046/document.

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La thermodynamique a été développée au XIXe siècle pour décrire la physique des moteurs et autres machines thermiques macroscopiques. Depuis lors, le progrès des nanotechnologies a rendu nécessaire d'étendre ces lois, initialement pensées pour des systèmes classiques, aux systèmes obéissant à la mécanique quantique. Durant cette thèse, j'ai mis en place un formalisme pour étudier la thermodynamique stochastique des systèmes quantiques, dans lequel la mesure quantique occupe une place centrale: à l'instar du bain thermique de la thermodynamique statistique classique, la mesure est ici la source

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5

Buchler, Benjamin Caird. "Electro-optic control of quantum measurements." View thesis entry in Australian Digital Theses Program, 2001. http://thesis.anu.edu.au/public/adt-ANU20020527.131758/index.html.

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6

Webb, James Engineering &amp Information Technology Australian Defence Force Academy UNSW. "The measurement, creation and manipulation of quantum optical states via photodetection." Awarded by:University of New South Wales - Australian Defence Force Academy. Engineering & Information Technology, 2009. http://handle.unsw.edu.au/1959.4/43686.

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In this thesis, we demonstrate an array of photodetection theory and techniques bridging the traditional discrete and continuous variable experimental domains. In quantum optics, the creation and measurement of states of light are intertwined and we present experimental architectures considering both aspects. We describe the measurement of mean photon numbers at optical sideband frequencies using homodyne detection. We use our technique to provide a direct comparison to photon-counting measurements and observe that our technique exhibits superior speed, dynamic range and mode selectivit

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7

Folland, Thomas. "Frequency control of terahertz quantum cascade lasers : theory and measurement." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/frequency-control-of-terahertz-quantum-cascade-lasers-theory-and-measurement(d4c55769-f053-4b79-aed3-e2fec575adde).html.

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Terahertz (THz) technology stands to solve a number of problems in everyday life, from next generation wireless communication to spectroscopic identification and imaging. However it is technically challenging to make a high power, compact source for terahertz radiation. The Quantum Cascade Laser (QCL), which produces gain at THz frequencies by exploiting inter-sub-band transitions in quantum wells, offers one solution to this problem. However controlling and detecting the emission from such sources remains a major challenge. This thesis investigates the theory and measurement of emission frequ

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8

Arzani, Francesco. "Measurement based quantum information with optical frequency combs." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE005/document.

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Ce manuscrit porte sur l’étude théorique de techniques expérimentales récemment développées pour réaliser des protocoles d’information quantique en variables continues. Les états Gaussiens multi-modes produits par conversion paramétrique de peignes de fréquences optiques jouent un rôle centrale dans ce travail. Ce phénomène permet de générer de façon déterministe un grand nombre d’états Gaussiens de la lumière. L’état de sortie peut ensuite être de-Gaussifié par soustraction ou addition d’un photon dans une superposition cohérente de modes du champ, puis mesuré par détection homodyne. La thèse

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9

Thomas-Peter, Nicholas. "Quantum enhanced precision measurement and information processing with integrated photonics." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:7bd47582-d32f-4d07-9e90-4978c32cf14e.

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Photons have proven to be an effective test-bed for the fundamental concepts and elements of quantum-enhanced technologies. As systems become increasingly complex, however, practical considerations make the traditional approach of bulk optics and free-space propagation progressively more difficult. The major obstacles are the physical space necessary to realise and operate such a complex system, its stability, and maintaining low losses. In order to address these issues, quantum optical technologies can take a cue from their classical counterparts and look towards an integrated architecture to

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10

Mazzucchi, Gabriel. "Conditional many-body dynamics and quantum control of ultracold fermions and bosons in optical lattices coupled to quantized light." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:6c6eddac-41de-476d-851e-6630907965e6.

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We study the atom-light interaction in the fully quantum regime, with the focus on off-resonant light scattering into a cavity from ultracold atoms trapped in an optical lattice. Because of the global coupling between the atoms and the light modes, observing the photons leaking from the cavity allows the quantum nondemolition (QND) measurement of quantum correlations of the atomic ensemble, distinguishing between different quantum states. Moreover, the detection of the photons perturbs the quantum state of the atoms via the so-called measurement backaction. This effect constitutes an unusual a

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11

Cabart, Clément. "Measurement and control of electronic coherences." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN031/document.

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Ces dernières années, de considérables efforts expérimentaux ont été dévoués au développement d’outils de nanoélectronique quantique, dans le but d’atteindre un niveau de contrôle sur le transport électronique quantique à l’échelle de l’électron unique. Ces avancées ont poussé à un changement de paradigme dans le domaine du transport électronique cohérent et donné naissance à l’optique quantique électronique, domaine dans lequel cette thèse s’inscrit. Cette thèse est consacrée à deux problématiques. Tout d’abord, elle s’intéresse au problème des interactions Coulombiennes entre électrons, qui

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12

Jeffery, Arvi Denbigh 1960. "MEASUREMENT AND MODELING OF THE NONLINEAR ABSORPTION AND REFRACTIVE INDEX OF BULK GALLIUM-ARSENIDE AND GALLIUM-ARSENIDE/ALUMINUM-GALLIUM - ARSENIDE MULTIPLE-QUANTUM-WELLS." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276435.

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13

Harvey, Tyler. "Electron Orbital Angular Momentum| Preparation, Application and Measurement." Thesis, University of Oregon, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10599464.

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<p> The electron microscope is an ideal tool to prepare an electron into a specified quantum state, entangle that state with states in a specimen of interest, and measure the electron final state to indirectly gain information about the specimen. There currently exist excellent technologies to prepare both momentum eigenstates (transmission electron microscopy) and position eigenstates (scanning transmission electron microscopy) in a narrow band of energy eigenstates. Similarly, measurement of the momentum and position final states is straightforward with post-specimen lenses and pixelated det

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14

Lolli, Jared. "Quantum Measurement and Feedback Control of highly nonclassical Photonic States." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC223/document.

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Ces dernières années, les progrès réalisés dans le contrôle de l'interaction lumière-matière au niveau quantique ont conduit à de nombreuses avancées en optique quantique, en particulier dans l'étude de phénomènes quantiques fondamentaux, dans la conception de systèmes quantiques artificiels et dans les applications en information quantique. Il a notamment été possible d'augmenter considérablement l'intensité de l'interaction lumière-matière et de contrôler le couplage de systèmes quantiques à leur environnement, afin d'obtenir des états non conventionnels et fortement non classiques. Cependan

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15

Leary, Cody Collin 1981. "Measurement and control of transverse photonic degrees of freedom via parity sorting and spin-orbit interaction." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10910.

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xv, 215 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>In this dissertation, several new methods for the measurement and control of transverse photonic degrees of freedom are developed. We demonstrate a mode sorter for two-dimensional (2-D) parity of transverse spatial states of light based on an out-of-plane Sagnac interferometer. The first experimental 2-D parity sorting measurements of Hermite-Gauss transverse spatial modes are presented. Due to the inherent phase stability of this ty

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16

Schröder, Tim. "Integrated photonic systems for single photon generation and quantum applications." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16723.

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Im Rahmen der vorliegenden Dissertation wurden neuartige integrierte Einzelphotonenquellen (EPQ) und ihre Anwendung für die Quanteninformationsverarbeitung entwickelt und untersucht. Die Erzeugung von Einzelphotonen basiert auf einzelnen Defektzentren in nanometergroßen Diamantkristallen mit einzigartigen optischen Eigenschaften: Stabilität bei Zimmertemperatur ohne optisches Blinken. Diamantkristalle mit Größen bis unter 20nm wurden mit neuartigen „pick-and-place“ Techniken (z.B. mit einem Atomkraftmikroskop) in komplexe photonische Strukturen integriert. Zwei unterschiedliche Ansätze für di

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17

Tan, Eng Kiang. "Retrodiction and continuous measurements in quantum optics." Thesis, University of Strathclyde, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417325.

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18

Buchler, Benjamin Caird, and ben buchler@anu edu au. "Electro-optic control of quantum measurements." The Australian National University. Faculty of Science, 2002. http://thesis.anu.edu.au./public/adt-ANU20020527.131758.

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The performance of optical measurement systems is ultimately limited by the quantum nature of light. In this thesis, two techniques for circumventing the standard quantum measurement limits are modelled and tested experimentally. These techniques are electro-optic control and the use of squeezed light. An optical parametric amplifier is used to generate squeezing at 1064nm. The parametric amplifier is pumped by the output of a second harmonic generation cavity, which in turn is pumped by a Nd:YAG laser. By using various frequency locking techniques, the quadrature phase of the squeezing i

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19

Menzies, David. "Procrustean entanglement concentration, weak measurements and optimized state preparation for continuous-variable quantum optics." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/739.

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20

Schilling, Uwe [Verfasser], and Joachim von [Akademischer Betreuer] Zanthier. "Measurements in Quantum Optics / Uwe Schilling. Betreuer: Joachim von Zanthier." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2011. http://d-nb.info/1015475051/34.

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21

Mehta, Karan K. (Karan Kartik). "Integrated optical quantum manipulation and measurement of trapped ions." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108849.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages [165]-183).<br>Individual atomic ions confined in designed electromagnetic potentials and manipulated via lasers are strong candidates as physical bases for quantum information processing (QIP). This is in large part due to t

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22

Smith, Gregory A. "Continuous Optical Measurement of Cold Atomic Spins." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/194781.

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Quantum measurement is one of the most important features of quantum theory. Although mathematical predictions have been verified in great detail, practical implementation has lagged behind. Only recently have people begun to take advantage of quantum measurement properties to produce new technologies. This research helps fill that technological gap by experimental examination of a continuous, optical measurement for an ensemble of cold atomic spins. The essential physics reduces to the interaction between an atomic ensemble and a weak optical field, which has many well known results. While th

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23

Arrighi, Everton. "Time-resolved measurements of collective effects in quantum conductors." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY001.

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La dynamique d'un système quantique est très sensible à la dimensionnalité. Alors que les systèmes électroniques à deux dimensions forment les liquides de Fermi, les systèmes à une dimension - les liquides de Tomonaga – Luttinger - sont décrits par des excitations purement bosoniques, même s’ils sont initialement constitués de fermions. Avec l'avènement de sources cohérentes à un seul électron, la dynamique quantique d'un tel liquide est maintenant accessible au niveau d'un seul électron.Dans ce travail de thèse, nous étudions le cas le plus général où le système peut être réglé en continu d’u

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24

Vidrighin, Mihai-Dorian. "Quantum optical measurements for practical estimation and information thermodynamics." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/45048.

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The implementation of optical quantum technologies requires precise and complete characterisation tools for multi-mode nonclassical states of light. In this thesis, we propose and we implement experimentally three applications of optical quantum measurements, which combine aspects of light that are described by both discrete and continuous variables. In the rst part of this thesis, we present a new scheme for interferometric phase estimation, which uses double homodyne measurements as an alternative to photon counting. We show that, without requiring a phase reference, this scheme can achieve

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25

Burton, William Cody. "Ultracold bosons in optical lattices for quantum measurement and simulation." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123353.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 131-139).<br>Ultracold atoms provide a platform that allows for pristine control of a physical system, and have found uses in both the fields of quantum measurement and quantum simulation. Optical lattices, created by the AC Stark shift of a coherent laser beam,

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26

Dreiser, Jan. "Optical study, preparation and measurement of a single quantum-dot spin." kostenfreifrei, 2007. http://e-collection.ethbib.ethz.ch/view/eth:29799.

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27

Amponsah, Sylvester. "Optical Characterization of Nitrogen-vacancy Centers andResonance Analysis of CVD Grown Diamond MEMS Devices." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1528479091207253.

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28

Ogawa, Kazuhisa. "Optical Interferometric Measurements Inspired by Time-Reversal Symmetry of Quantum Mechanics." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/202718.

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29

Coroy, Trenton. "Wavelength measurement systems for Bragg fiber optic sensors based on quantum well electroabsorption photodetectors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0022/NQ50030.pdf.

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30

Norris, David J. (David James). "Measurement and assignment of the size-dependent optical spectrum in cadmium selenide (CdSe) quantum dots." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11129.

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31

Leslie, Nathaniel. "Maximal LELM Distinguishability of Qubit and Qutrit Bell States using Projective and Non-Projective Measurements." Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/hmc_theses/108.

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Many quantum information tasks require measurements to distinguish between different quantum-mechanically entangled states (Bell states) of a particle pair. In practice, measurements are often limited to linear evolution and local measurement (LELM) of the particles. We investigate LELM distinguishability of the Bell states of two qubits (two-state particles) and qutrits (three-state particles), via standard projective measurement and via generalized measurement, which allows detection channels beyond the number of orthogonal single-particle states. Projective LELM can only distinguish 3 of 4

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32

Chowdhury, Sanchari. "Application of Luminescence Sensors in Oxygen Diffusion Measurement and Study of Luminescence Enhancement/Quenching by Metallic Nanoparticles." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1599.

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The first part of this dissertation deals with the application of a luminescence quenching method to measure diffusion and permeation coefficients of oxygen in polymers. Most luminescence oxygen sensors do not follow linearity of the Stern-Volmer (SV) equation due to heterogeneity of luminophore in the polymer matrix, thus the complexity of data analysis is increased. To circumvent this limitation, inverted fluorescence microscopy is utilized in this work to investigate the SV response of the sensors at the micron-scale. In these diffusion experiments, oxygen concentration is measured by lumin

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33

Thota, Venkata Ramana Kumar. "Tunable Optical Phenomena and Carrier Recombination Dynamics in III-V Semiconductor Nanostructures." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1451807323.

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34

Pal, Singh Amrit [Verfasser], and Roman [Akademischer Betreuer] Schnabel. "Intensity-dependent phase shifts in optical materials for quantum state preparation and absorption measurements in thin film coatings and bulk material / Amrit Pal Singh ; Betreuer: Roman Schnabel." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1161530266/34.

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35

Tran, Dang Bao An. "Widely tunable and SI-traceable frequency-comb-stabilised mid-infrared quantum cascade laser : application to high precision spectroscopic measurements of polyatomic molecules." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCD060.

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Ce manuscrit présente le développement d’un spectromètre dans le moyen infra-rouge qui combine très haute résolution, accordabilité, sensibilité de détection et contrôle de la fréquence absolue. Un laser à cascade quantique (QCL) émettant à 10.3 μm est asservi en phase sur un peigne de fréquences optique lui-même stabilisé sur un laser ultrastable à 1.55 μm transmis par lien optique fibré à partir du LNE-SYRTE, où cette référence de fréquence est contrôlée par rapport aux étalons primaires. On obtient ainsi un QCL de largeur ~ 0.1 Hz, avec une stabilité meilleure que 10⁻¹⁵ à 1 s, et une incert

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36

Prouvé, Claire. "Measurement of the CP-even fraction of the D⁰→2π⁺2π⁻ decay using quantum correlated DD̄ pairs at CLEO-c, and real-time alignment of the LHCb RICH optical systems". Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761238.

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37

Hoang, Vu Dinh. "Charge transport study of InGaAs two-color QWIPs." Thesis, Monterey California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1574.

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Approved for public release, distribution is unlimited<br>In this thesis, a series of experiments were performed to characterize the material properties of InGaAs/GaAs for use in a two-color quantum-well IR photodetector (QWIP) design. Results from room temperature studies using cathodoluminescence and photoluminescence indicated light emission at 858 nm and 1019 nm from GaAs and InGaAs, respectively. Using a direct transport imaging technique, an edge dislocation pattern was observed and shown to be confined to the InGaAs layer of the material. A dislocation density measurement was performed

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38

Vanderbruggen, Thomas. "Détection non-destructive pour l’interférométrie atomique et Condensation de Bose-Einstein dans une cavité optique de haute finesse." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112067/document.

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Ce mémoire de thèse étudie diverses méthodes d'amélioration des interféromètres atomiques. Dans la première partie du manuscrit, nous analysons comment une détection non-destructive, au sens où elle préserve la cohérence entre les états internes de l'ensemble atomique, permet d'améliorer la sensibilité des interféromètres. Nous montrons tout d'abord, grâce à une étude théorique, que la projection du vecteur d'onde engendrée par la mesure permet de préparer des états comprimés de spin. Nous présentons ensuite la mise en œuvre de cette méthode à l'aide d'une détection reposant sur la spectroscop

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Hadjar, Yassine. "Etude du couplage optomécanique dans une cavité de grande finesse; observation du mouvement Brownien d'un miroir." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1998. http://tel.archives-ouvertes.fr/tel-00004675.

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Nous étudions théoriquement et expérimentalement le couplage optomécanique induit par la pression de radiation entre un faisceau lumineux et un objet macroscopique tel qu'un miroir. Nous présentons une étude théorique des effets quantiques induits par la pression de radiation dans une cavité optique dont un miroir est mobile. Le miroir peut se déplacer sous l'effet de la pression de radiation et ce mouvement change la phase du champ réfléchi par la cavité. Ce couplage optomécanique induit un déphasage du champ équivalent à un effet Kerr optique. Un tel dispositif peut être utilisé pour produir

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40

(11199132), Xin Chen. "Temporal mode structure and its measurement of entangled fields in continuous and discrete variables." Thesis, 2021.

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<div>Field-orthogonal temporal mode analysis of optical fields was recently developed to form a new framework of quantum information science. But so far, the exact profiles of the temporal modes are not known, which makes it difficult to achieve mode selection and de-multiplexing. A novel feedback-iteration method which, combined with the stimulated emission method, can give rise to the exact forms of the temporal mode structure of pulse-pumped spontaneous parametric processes both for high gain parametric process, which gives rise to quantum entanglement in continuous variables, and for the l

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Biggerstaff, Devon. "Experiments with Generalized Quantum Measurements and Entangled Photon Pairs." Thesis, 2009. http://hdl.handle.net/10012/4841.

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This thesis describes a linear-optical device for performing generalized quantum measurements on quantum bits (qubits) encoded in photon polarization, the implementation of said device, and its use in two diff erent but related experiments. The device works by coupling the polarization degree of freedom of a single photon to a `mode' or `path' degree of freedom, and performing a projective measurement in this enlarged state space in order to implement a tunable four-outcome positive operator-valued measure (POVM) on the initial quantum bit. In both experiments, this POVM is performed on one ph

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42

Mow-Lowry, Conor Malcolm. "Thermal noise and optical cooling." Phd thesis, 2011. http://hdl.handle.net/1885/150253.

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Thermal noise and optical quantum noise place fundamental limits on the displacement sensitivity of interferometric gravitational wave detectors. Projects such as Advanced LIGO employ a wide range of techniques to reduce thermal noise and use very high optical powers to reduce quantum noise. Thermal noise is Brownian motion caused by the thermal energy in each mode of oscillation. It is fundamentally linked with mechanical loss via the fluctuation-dissipation theorem. The thermal energy of, for example, the fundamental resonance of the suspension of a mirror can be concentrated into the reson

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Schumaker, Bonny Laura. "Theoretical Investigations in Nonlinear Quantum Optics, Theory of Measurement, and Pulsations of General Relativistic Models of Neutron Stars." Thesis, 1985. https://thesis.library.caltech.edu/10414/8/Schumaker_BL_1985.pdf.

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<p>This thesis is a collection of six papers. The first four constitute the heart of the thesis; they are concerned with quantum mechanical properties of certain harmonic-oscillator states. The first paper is a discourse on single-mode and two-mode Gaussian pure states (GPS), states produced when harmonic oscillators in their ground states are exposed to potentials that are linear or quadratic in oscillator position and moment um variables (creation and annihilation operators). The second and third papers develop a formalism for analyzing two-photon devices (e.g., parametric amplifiers and pha

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Buchler, Benjamin. "Electro-optic control of quantum measurements." Phd thesis, 2001. http://hdl.handle.net/1885/46232.

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The performance of optical measurement systems is ultimately limited by the quantum nature of light. In this thesis, two techniques for circumventing the standard quantum measurement limits are modelled and tested experimentally. These techniques are electro-optic control and the use of squeezed light. ...

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Beaudry, Normand James. "Squashing Models for Optical Measurements in Quantum Communication." Thesis, 2009. http://hdl.handle.net/10012/4800.

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Many protocols and experiments in quantum information science are described in terms of simple measurements on qubits. However, in an experimental implementation, the exact description of the measurement is usually more complicated. If there is a claim made from the results of an experiment by using the simplified measurement description, then do the claims still hold when the more realistic description is taken into account? We present a "squashing" model that decomposes the realistic measurement description into first a map, followed by a simplified measurement. The squashing model then prov

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Wade, Andrew. "Quantum limited measurements in gravitational wave detectors." Phd thesis, 2016. http://hdl.handle.net/1885/110016.

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Gravitational waves manifest as a time varying straining of space: they arise from the accelerating motions of large bodies of mass and propagate across the universe at the speed of light as ripples in the fabric of space-time, a fleetingly weak effect so far eluding direct detection. The detection of gravitation waves is expected to yield a rich vein to observational astronomy, complementing existing electromagnetic surveys and revealing a hitherto unexplored range of phenomena. First generation interferometric gravitational wave detectors, notably

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"Nonlinear optical measurement of Berry curvature in time-reversal-invariant insulators." 2012. http://library.cuhk.edu.hk/record=b5549156.

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當絶熱地改變哈密頓量的參數時，波函數會獲得一個幾何相位，既 Berry相。它可以表示為參數空間內一個局域的規範場，叫作 Berry曲率。Berry曲率在凝聚態物理的許多領域的研究中起著至關重要的作用，例如量子霍爾效應以及拓撲絶緣體。因此它已成為固體的最基本的性質之一。在量子霍爾效應中，霍爾電導可以表示為 Berry曲率在布里淵區上的積分。這個積分是一個量子化的 Chern數，並且反映了系統的拓撲結構。然而由於時間反演對稱性，拓撲絶緣體的霍爾電導等於零。因此對時間反演不變絶緣體的 Berry曲率的直接以及非破壞性的測量已經成為凝聚態物理中的重要問題。<br>在這篇論文中，我們提出標準的非線性光譜學可以用來探測時間反演不變絶緣體的性質，而且非線性光譜學的實驗比直流實驗更可控。通過計算，我們發現當遠紅外光和 THz光入射到樣品上時，系統的三階光學響應不為零，這與輸運實驗的結果相比形成了鮮明的對比。更重要的是響應函數正比於能帶的非阿貝爾 Berry曲率。這個結果提供了直接測量時間反演不變系統的 Berry曲率的可能性。<br>對具有(近似的 )空間旋轉對稱性的時間反演不變絶緣體，我們發現三階光學響應與等能球面的 Berry曲率通量直接相關。由於 Berry曲率通量給出了能帶簡併點處的奇異單子的拓撲電荷，因此人們可以利用這種方法直接測量能帶的拓撲結構。作為一個例子，這個方法被應用於 III-

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Yu, Chih-Hao, and 余治浩. "Measurement and Analysis of Optical Gain and Loss of Quantum-Dot and Quantum-Well Structures." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/70762928024284971976.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>93<br>Gain spectrum measurement plays an important role in analysis of semiconductor electro-optic devices. Traditionally, the Hakki-Paoli method is used to measure the modulation depth of the Fabry–Perot mode spectrum of lasers below threshold. In this study, we introduce a variable-stripe-length method with current injection and a multi-section device method to demonstrate the gain spectrum measurement of quantum-dot and quantum-well structures. In this thesis, we discuss the modal gain in ground states and excited states of quantum-dot and quantum-well samples.

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Shen, I.-Chia, and 沈宜佳. "Measurement of Quantum Efficiency of Silicate phosphors for Precise Optical Modeling." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65865967486559199367.

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碩士<br>國立中央大學<br>光電科學研究所<br>97<br>As well known, in addition to the ways of packaging, the conversion efficiency of the various applied phosphors also has greatly effect on the luminous efficiency in the phosphor-based white light LEDs. In such a way, it has become a very important issue that how to evaluate the quantum efficiency of phosphors. In this thesis, we has proposed an improved measuring setup for obtain the precise quantum efficiency of phosphors. The accuracy of the measurement has much enhanced in analysis. Besides, we also study the optical model to precisely describe the spatial

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Chen, Chien-An, and 陳建安. "Fabrication and Optical Measurements of Microdisks Embedded with InGaAs Quantum Dots." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52760767011424970145.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>95<br>Owing to the geometrical symmetry of microdisk (MD) cavities, they support whispering gallery modes (WGMs) in which light circulates around the periphery of the structure and is confined by total internal reflections at both the sidewall and the top and bottom surfaces of the MD. Being cladded symmetrically by the air at both surfaces, light is well confined inside the MD due to the large refractive index difference. With the InGaAs quantum dots (QDs) as the active region in the MD, the much broader gain spectrum allows more resonant WGMs to be observed due to

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