Дисертації з теми "Quantum optics and quantum optomechanics"
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Kelly, Stephen C. "EXPLORATION OF QUBIT ASSISTED CAVITY OPTOMECHANICS." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1408097717.
Повний текст джерелаElouard, Cyril. "Thermodynamics of quantum open systems : applications in quantum optics and optomechanics." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY046/document.
Повний текст джерелаThermodynamics was developed in the XIXth century to provide a physical description to engines and other macroscopic thermal machines. Since then, progress in nanotechnologies urged to extend these formalism, initially designed for classical systems, to the quantum world. During this thesis, I have built a formalism to study the stochastic thermodynamics of quantum systems, in which quantum measurement plays a central role : like the thermal reservoir of standard stochastic thermodynamics, it is the primary source of randomness in the system's dynamics. I first studied projective measurement as a thermodynamic process. I evidenced that measurement is responsible for an uncontroled variation of the system's energy that I called quantum heat, and also a production of entropy. As a proof of concept, I proposed an engine extracting work from the measurement-induced quantum fluctuations. Then, I extended this formalism to generalized measurements, which allowed to describe open quantum systems (i.e. in contact with reservoirs). I defined work, heat and entropy production for single realizations of thermodynamic protocols, and retrieved that these quantities obey fluctuation theorems. I applied this formalism to the canonical situation of quantum optics, i.e. a Qubit coupled to a laser and a the vacuum. Finally, I studied a promising platform to test Qubit's thermodynamics: a hybrid optomechanical system.The formalism developed in this thesis could be of interest for the quantum thermodynamics community as it enables to characterize quantum heat engines and compare their performances to their classical analogs. Furthermore, as it sets quantum measurement as a thermodynamic process, it pave the ways to a new kind of thermodynamic machines, exploiting the specificities of quantum realm in an unprecedented way
McCutcheon, Robert A. "Hybrid Optomechanics and the Dynamical Casimir Effect." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501191323617929.
Повний текст джерелаSeok, HyoJun. "Aspects Of Multimode Quantum Optomechanics." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/332877.
Повний текст джерелаTumanov, Dmitrii. "Actuation and motion detection of different micro- and nano-structures." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY045/document.
Повний текст джерелаThis thesis is related to the field of opto-mechanics and the use of different techniques for the measurement and manipulation of mechanical properties of nano-structures.First part of the work is dedicated to the photonic wires. These objects are GaAs structures with an inverted conical shape of length of the order of 10 µm and diameter of less than 1 µm, containing a layer of InAs quantum dots inside. Wide-range static stress-tuning of quantum dots photoluminescence spectrum was demonstrated using nano-manipulators to bend the wires. Additionally, owing to the spatial dependence of the spectral shift, this technique offers the possibility of QD positions mapping.The second part of this work concerns the optical actuation of these photonic wires. A laser beam focused on the wire and modulated at the mechanical resonance frequency can set the wire in motion. The physical mechanisms responsible for these effects are presented and discussed.In the third part is presented a method enabling the detection of mechanical oscillations of small (less than 50 nm in diameter) nanowires with the use of a Scanning Electron Microscope. This original method offers a possibility to detect the motion of many types of micro- and nano-electromechanical devices which are too small to be detected optically owing to light diffraction limit.Moreover, this method also affects the mechanical properties of the structures via a back-action force that becomes non-negligible for such small devices. It opens up the possibility for further fundamental studies related to cooling of the mechanical motion
Yeo, Inah. "A quantum dot in a photonic wire : spectroscopy and optomechanics." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY076/document.
Повний текст джерелаIn the framework of this thesis, single InAs/GaAs quantum dot devices were studied by optical means. Starting with a general description of self-assembled InAs QDs, two types of single QD devices were presented. The first approach was a tapered GaAs photonic wire embedding single InAs QDs whose efficiency as a single photon source was previously shown to be 90%. We investigated several optical properties of the single QDs. The charged and neutral states of the QD were identified and selectively excited using quasi-resonant excitation.The first original result of this thesis is the observation of a continuous temporal blue-drift of the QD emission energy. We attributed this blue drift to oxygen adsorption onto the sidewall of the wire, which modified the surface charge and hence the electric field seen by the QD. Moreover, we demonstrated that a proper coating of the GaAs photonic nanowire surface suppressed the drift. The temperature effect on this phenomenon revealed an adsorption peak around 20K, which corresponds to the adsorption of oxygen on GaAs. This observation is in good agreement with previous temperature studies with a tapered photonic wire. This was the first study of the spectral stability of photonic wires embedding QDs, crucial for resonant quantum optics experiments. As an alternative, we took advantage of this temporal drift to tune QD emission energies. In a controlled way, we tuned into resonance two different QDs which were embedded in the same photonic nanowire. In the last part of this work, we studied the influence of the stress on single QDs contained in a trumpet-like GaAs photonic wire. The main effect of stress is to shift the luminescence lines of a QD. We applied the stress by exciting mechanical vibration modes of the wire. When the wire is driven at its the mechanical resonance the time-integrated photoluminescence spectrum is broaden up to 1 meV owing to the oscillating stress, The measured spectral modulation is a first signature of strain-mediated coupling between a mechanical resonator and embedded QD single light emitter. With a stroboscopic technique, we isolated a certain phase of the oscillating wire and thereby selected a value of QD emission energies. As a highlight of our study, we managed to bring two different QDs contained in the same wire into resonance by controlling their relative phase. In addition, we could extract the 2D spatial positioning of embedded QDs from the spectral shifts observed for two orthogonal mechanical polarizations.. The investigation of the strain-mediated tuning of QDs can, therefore, be an effective tool to explore the QD positions without destroying the sample
Mirza, Imran. "Storage, Interference and Mechanical Effects of Single Photons in Coupled Optical Cavities." Thesis, University of Oregon, 2014. http://hdl.handle.net/1794/18525.
Повний текст джерела10000-01-01
Abbs, Charlotte. "Quantum dynamics of non-linear optomechanical systems." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/27692/.
Повний текст джерелаMonsel, Juliette. "Thermodynamique quantique et optomécanique." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY051.
Повний текст джерелаThermodynamics was developed in the 19th century to study steam engines using the cyclical transformations of a working substance to extract heat from thermal baths and convert it into work, possibly stored in a battery. This applied science eventually led to the development of fundamental concepts such as irreversibility. Quantum thermodynamics aims at revisiting these results when the working substances, baths and batteries become quantum systems. Its results are still mainly theoretical. This thesis therefore propose methods to measure work in situ, directly inside the battery, and demonstrate the potential of two platforms to pave the way to the experimental exploration of this fast-growing field.First, I studied hybrid optomechanical systems which consist of a qubit coupled to the electromagnetic field on the one hand, and to a mechanical resonator on the other hand. The qubit's transition frequency is modulated by the vibrations of the mechanical system that exerts in this way a force on the qubit. The mechanical degree of freedom exchanges work with the qubit and therefore behaves like a dispersive battery, i.e. whose natural frequency is very different from the one of the qubit's transition. Finally, the electromagnetic field plays the role of the bath. I showed that the fluctuations of the mechanical energy are equal to the fluctuations of work, which allows the direct measurement of entropy production. As a result, hybrid optomechanical systems are promising for experimentally testing fluctuation theorems in open quantum systems. In addition, I studied optomechanical energy conversion. I showed that a hybrid optomechanical system can be considered as an autonomous and reversible thermal machine allowing either to cool the mechanical resonator or to build a coherent phonon state starting from thermal noise.Secondly, I showed that a two-stroke quantum engine extracting work from a single, non-thermal, bath can be made. The qubit is embedded in a one-dimensional waveguide and the battery is the waveguide mode of same frequency as the qubit's transition. Therefore, this is a resonant battery, unlike in the previous case. First, the qubit is coupled to the engineered bath, source of energy and coherence, that makes it relax in a experimentally controllable superposition of energy states. Secondly, the bath is disconnected and work is extracted by driving the qubit with a resonant coherent field. This kind of system, called one-dimensional atom, can be implemented in superconducting or semiconducting circuits. The coherence of the qubit's state improves the performances of this engine both in the regime of classical drive, where a large number of photons is injected in the battery, and in the quantum drive regime of low photon numbers.This thesis evidences the potential of hybrid optomechanical systems and one-dimensional atoms to explore experimentally on the one hand, irreversibility and fluctuation theorems, and on the other hand, the role of coherence in work extraction
Park, Young-Shin 1972. "Radiation pressure cooling of a silica optomechanical resonator." Thesis, University of Oregon, 2009. http://hdl.handle.net/1794/10559.
Повний текст джерелаThis dissertation presents experimental and theoretical studies of radiation pressure cooling in silica optomechanical microresonators where whispering gallery modes (WGMs) are coupled to thermal mechanical vibrations. In an optomechanical system, circulating optical fields couple to mechanical vibrations via radiation pressure, inducing Stokes and anti-Stokes scattering of photons. In analogy to laser cooling of trapped ions, the mechanical motion can in principle be cooled to its ground state via the anti-Stokes process in the resolved-sideband limit, in which the cavity photon lifetime far exceeds the mechanical oscillation period. Our optomechanical system is a slightly deformed silica microsphere (with a diameter 25-30 μm ), featuring extremely high Q -factors for both optical ( Q o ∼ 10 8 ) and mechanical ( Q m ∼ 10 4 ) systems. Exploiting the unique property of directional evanescent escape in the deformed resonator, we have developed a free-space configuration for the excitation of WGMs and for the interferometric detection of mechanical displacement, for which the part of input laser that is not coupled into the microsphere serves as a local oscillator. Measurement sensitivity better than 5 × 10 -18 m /[Special characters omitted.] has been achieved. The three optically active mechanical modes observed in the displacement power spectrum are well described by finite element analysis. Both radiation pressure cooling and parametric instabilities have been observed in our experiments. The dependence of the mechanical resonator frequency and linewidth on the detuning as well as the intensity of the input laser show excellent agreement with theoretical calculations with no adjustable parameters. The free-space excitation technique has enabled us to combine resolved sideband cooling with cryogenic cooling. At a cryogenic temperature of 1.4 K, the sideband cooling leads to an effective temperature as low as 210 m K for a 110 MHz mechanical oscillator, corresponding to an average phonon occupation of 37, which is one of the three lowest phonon occupations achieved thus far for optomechanical systems. The cooling process is limited by ultrasonic attenuation in fused silica, which should diminish when bath temperature is further lowered, with a 3 He cryostat, to a few hundred millikelvin. Our experimental studies thus indicate that we are tantalizingly close to realizing the ground-state cooling for the exploration of quantum effects in an otherwise macroscopic mechanical system.
Committee in charge: Michael Raymer, Chairperson, Physics; Jens Noeckel, Member, Physics; Hailin Wang, Member, Physics; Paul Csonka, Member, Physics; Jeffrey Cina, Outside Member, Chemistry
Siqueira, Maicon Zaniboni 1986. "O campo eletromagnético quantizado submetido a ruído e acoplado a um oscilador mecânico." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277338.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
Made available in DSpace on 2018-08-20T20:42:28Z (GMT). No. of bitstreams: 1 Siqueira_MaiconZaniboni_M.pdf: 1258175 bytes, checksum: 2b8416f748d7b0825f2c173a2cf99c66 (MD5) Previous issue date: 2012
Resumo: Neste projeto será investigada a influência de ruído no processo de interação da radiação (campo quantizado) com a matéria (sistema mecânico mesoscópico). Consideraremos o modo do campo confinado em uma cavidade de alto fator de qualidade com um espelho fixo e o outro espelho móvel, este tratado como um oscilador mecânico suscetível à pressão de radiação do campo da cavidade. Investigaremos a dinâmica do sistema na situação em que o modo do campo confinado estará submetido a um ruído causando perda de coerência de fase
Abstract: In this project we will investigate the influence of noise in the process of interaction of radiation (quantized field) with the matter (mesoscopic mechanical system). We will consider the mode field confined in a cavity of high quality factor with a fixed mirror and one moving mirror, this treated as a mechanical oscillator susceptible to radiation pressure from cavity field. We will investigate the system dynamics in the situation that the confined mode eld is submitted to noise causing loss of phase coeherence
Mestrado
Física
Mestre em Física
Neumeier, Lukas. "Novel regimes of quantum optomechanics." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/620785.
Повний текст джерелаEn la vida cotidiana, el impacto de la luz sobre el movimiento de los objetos mecánicos es insignificante. Sin embargo, los experimentos modernos que usan resonadores ópticos de alta calidad son capaces de observar efectos significativos que se originan de las fuerzas asociadas con los fotones en pequeños sistemas mecánicos. La característica común de estos sistemas es la dependencia de la frecuencia de resonancia óptica en la posición del objeto mecánico, que establece el campo de la optomecánica. Se han explorado muchos regímenes interesantes que permiten el entrelazamiento de fotones, el enfriamiento del movimiento por láser, la generación de estados de luz comprimidos e incluso la detección de ondas gravitacionales. Curiosamente, la interacción optomecánica es tan genérica que sus conceptos subyacentes y sus profundas consecuencias pueden aplicarse generalmente a una gran variedad de sistemas, como veremos en esta tesis. En el Capítulo 1, proporcionamos una breve descripción de los principales conceptos y resultados del campo de la optomecánica, antes de pasar a analizar los nuevos regímenes y aplicaciones que hemos identificado y propuesto. En el Capítulo 2, investigamos teóricamente los resultados de un par de experimentos que antes no se entendían bien. Estos experimentos atrapan nanopartículas dieléctricas a través de un modo de un resonador óptico y observan que las intensidades experimentadas por las partículas se reducen considerablemente en comparación con una trampa de pinzas ópticas convencional. Encontramos que estos sistemas se pueden describir completamente mediante un modelo optomecánico de juguete simple y demostramos que el potencial óptico dentro de los resonadores puede aproximarse a un pozo cuadrado casi perfecto. Este potencial se puede modificar dinámicamente cambiando la frecuencia de entrada del láser y encontramos una reducción drástica de las intensidades vistas por la partícula atrapada, lo que podría aumentar significativamente el rango de sistemas a los que se puede aplicar el atrapamiento óptico. Estos resultados son bastante notables y deberían tener implicaciones importantes para las futuras tecnologías de atrapamiento. En el Capítulo 3, reconocemos que una tendencia importante en el campo de la electrodinámica cuántica de cavidades (del inglés, "cavity QED") es lograr un régimen de acoplamiento fuerte. Se pueden producir dinámicas adicionales al considerar el grado de libertad de movimiento atómico. En particular, mostramos que dicho sistema es un candidato natural para explorar el régimen de acoplamiento fuerte optomecánico de un único fotón en optomecánica cuántica, pero donde la frecuencia de movimiento no puede ser resuelta por la cavidad. Mostramos que este régimen puede dar lugar a una serie de fenómenos notables, como un fuerte entrelazamiento entre la función de onda atómica y las propiedades de dispersión de los fotones incidentes individuales, o un mecanismo de calentamiento anómalo del movimiento atómico. En el Capítulo 4 mostramos que un átomo atrapado y acoplado a una cavidad constituye una plataforma atractiva para obtener el régimen de acoplamiento fuerte optomecánico con un único fotón y con bandas laterales mecánicas resueltas. La obtención de este régimen es un objetivo principal en el campo de la optomecánica, ya que permitiría la generación determinista de estados de luz no clásicos. Sin embargo, este régimen es difícil de lograr con los sistemas mecánicos convencionales debido a sus pequeños movimientos de punto cero. Como ejemplo, mostramos que el bloqueo de fotones inducido de forma mecánica puede realizarse en configuraciones realistas, donde la luz no clásica se genera solamente debido a la interacción de fotones con el movimiento atómico.
Lörch, Niels [Verfasser]. "Laser theory for quantum optomechanics / Niels Lörch." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://d-nb.info/1080269193/34.
Повний текст джерелаGarrido, Mauricio. "Quantum Optics in Coupled Quantum Dots." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1273589966.
Повний текст джерелаGao, Xuesong. "Quantum Nonlinear Optics." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1564662783494271.
Повний текст джерелаStock, Ryan. "Silicon-based quantum optics and quantum computing." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/111871/.
Повний текст джерелаBocquillon, Erwann. "Electron quantum optics in quantum Hall edge channels." Paris 6, 2012. http://www.theses.fr/2012PA066692.
Повний текст джерелаThis thesis is devoted to the implementation of quantum optics experiments in a ballistic quantum conductor, with single charge resolution. A mesoscopic capacitor produces on-demand single-electron excitations in the outermost edge channel of quantum Hall effect. We measure current fluctuations after partitioning of excitations on an electronic beamsplitter, in analogy with the Hanbury-Brown & Twiss experiment, so as to unveil neutral excitations (electron/holes pairs) that can accompany the emission of the charge. Thermal excitations in the Fermi sea are then responsible for two-particle interferences that yield information on the energy distribution of the generated quasiparticles. Using two independent and synchronized sources, we generate two indistinguishable quasiparticles that interfere on a beamsplitter as in the Hong-Ou-Mandel experiment. The visibility of this phenomenon could be limited by decoherence of the wavepackets due to interactions with the environment and especially with other co-propagating edge channels. By measuring the capacitive coupling between two co-propagating edge channels, we characterize the effects of Coulomb interaction on propagation and highlight a neutral mode of propagation. These experiments constitute the first implementations of electron quantum optics experiments with single charges. They pave the way to more complex experiments such as the tomography of a mono-electronic wavepacket
Restrepo, Juan Sebastián. "Theory of quantum optomechanics with unconventional nonlinear coupling schemes." Paris 7, 2014. http://www.theses.fr/2014PA077228.
Повний текст джерелаIn recent years the zoology of tamed quantum systems has witnessed the arrival of a new member. In the field of optomechanical cavities it has been proven that it is possible to lead micro and nano mechanical resonators to their vibrational quantum ground state. This feat is made possible by the ability of optomechanical resonators to optically cool down the brownian motion of the mechanical degrees of freedom. We study the cooling mechanisms in optomechanical cavities subject to unconventional coupling schemes. In particular we discuss how pfiotothermal cooling leads the mechanical resonator to its ground state in regimes of parameters for which the more usual radiation pressure based cooling is unable to quench effectively enough the thermal brownian motion. On the other hand the maturity of experimental optomechanics has opened the path for the exploration of strong coupling regimes where a single photon is enough to modify the mechanical properties beyond the zero point fluctuations. Following this trend we present as well our predictions for a system combining quantum electrodynamics and quantum optomechanics. We show that by introducing an artificial two level atom inside the optomechanical cavity the cooling and amplification of mechanical motion are greatly modified. We also show how the intrinsic non-linearity of the artificial atom leads to non-classical states of the mechanical resonator
Malz, Daniel Hendrik. "Periodic driving and nonreciprocity in cavity optomechanics." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/283253.
Повний текст джерелаEkert, Artur Konrad. "Correlations in quantum optics." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293479.
Повний текст джерелаHtoon, Han. "Studies on quantum coherence phenomena of self-assembled quantum dots." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3037502.
Повний текст джерелаDynes, James Francis. "Quantum optics in intersubband transitions in semiconductor quantum wells." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413944.
Повний текст джерелаPope, Damian. "Contrasting quantum mechanics to local hidden variables theories in quantum optics and quantum information science /." [St. Luica, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16765.pdf.
Повний текст джерелаDorier, Vincent. "Quantum theory of light in linear media : applications to quantum optics and quantum plasmonics." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCK006.
Повний текст джерелаWe develop a method of quantization of the electromagnetic field interacting with passive media on one hand, and active (plasmonic) media on the other hand. This method relies on the construction of a Hamiltonian structure compatible with the Maxwell equations, and then on a principle of correspondence and the definition of a Fock space of quantum states. We use the results of the quantum theory to study the propagation of photons in dielectric environments and the emission of single plasmons
Liu, Xunmimg. "Nonlinear dynamics in quantum optics /." St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17835.pdf.
Повний текст джерелаHessmo, Björn. "Quantum optics in constrained geometries." Doctoral thesis, Uppsala University, Department of Quantum Chemistry, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1208.
Повний текст джерелаWhen light exhibits particle properties, and when matter exhibits wave properties quantum mechanics is needed to describe physical phenomena.
A two-photon source produces nonmaximally entangled photon pairs when the source is small enough to diffract light. It is shown that diffraction degrades the entanglement. Quantum states produced in this way are used to probe the complementarity between path information and interference in Young's double slit experiment.
When two photons have a nonmaximally entangled polarization it is shown that the Pancharatnam phase is dependent on the entanglement in a nontrivial way. This could be used for implementing simple quantum logical circuits.
Magnetic traps are capable of holding cold neutral atoms. It is shown that magnetic traps and guides can be generated by thin wires etched on a surface using standard nanofabrication technology. These atom chips can hold and manipulate atoms located a few microns above the surface with very high accuracy. The potentials are very versatile and allows for highly complex designs, one such design implemented here is a beam splitter for neutral atoms. Interferometry with these confined de Broglie is also considered. These atom chips could be used for implementing quantum logical circuits.
Rippin, Michael Andrew. "Quantum optics of tailored cavities." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242050.
Повний текст джерелаD'Arcy, Michael Brendan. "Quantum chaos in atom optics." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249527.
Повний текст джерелаLinington, Ian. "Quantum optics with dynamic environments." Thesis, University of Sussex, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442428.
Повний текст джерелаChille, Vanessa. "Quantum optics with structured light." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066358/document.
Повний текст джерелаThis thesis aims at learning more about nonclassical structured light. Quantum optics and structured light are two topics that are subject to countless scientific examinations. However, they are very rarely combined and the quantum properties of structured light are not as thoroughly studied as they deserve. By structured light, we mean any light fields with complex transverse distributions of intensity, phase or polarization. We want to link the topics of quantum optics and structured light in this thesis. For this purpose, we experimentally generate particular nonclassical structured light fields. In particular, we construct an experimental setup that enables us, in principle, to produce arbitrary amplitude squeezed vector beams, i.e. light beams with a complex transverse structure of the state of polarization. Furthermore, we analyze spatial properties of light beams, and their quantum noise theoretically. We specifically perform theoretical examinations of the quantum noise in the width of a light beam. To show the feasibility of an experimental verification of our theoretical results, we conduct simulations for the measurement of spatial parameters of a beam's cross-section by a multipixel detector
Lipfert, Tobias. "Ordering effects in quantum optics." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R007/document.
Повний текст джерелаIn quantum optics, the quantum nature of light manifests itself in operator ordering effects, nonexistent in classical optics. This thesis is devoted to a detailed study of such ordering effects that are due to the dynamics of physical systems. We consider two systems in particular, 1) parametric down-conversion in a χ(2) medium, and 2) an ion in a Paul trap driven by a classical field; described by a nonlinear Jaynes-Cummings model. Ordering effects in these dynamical systems are studied via the Magnus expansion and approximation. In the parametric down-conversion scenario we consider two cases, (i) a monochromatic pump (where an exact solution of the dynamics is known), and (ii) a spectrally broad pump. For the monochromatic pump, we write explicitly the Bloch-Messiah decomposition and obtain the squeezing eigenmodes and parameters. We compare these exact results with the Magnus approximations that contain some or no ordering effects. We perform similar analysis for the spectrally broad pump, where the Bloch-Messiah decomposition can only be evaluated numerically. For the dynamics in the nonlinear Jaynes-Cummings model we again analyze ordering effects via Magnus approximations and obtain the exact solution, which has not been published in the literature before. Lastly, we evaluate the exact upper bounds (which exceed sufficient bounds) of convergence of the Magnus expansion for the two models with exact solutions, for the first time
McDermott, Roger. "A quantum group approach to some exotic states in quantum optics." Thesis, Open University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261140.
Повний текст джерелаKaiser, Florian. "Photonic entanglement engineering for quantum information applications and fundamental quantum optics." Nice, 2012. https://tel.archives-ouvertes.fr/tel-00777002.
Повний текст джерелаThe aim of this thesis is to develop sources of photonic entanglement to study both quantum networking tasks and some of the foundations of quantum physics. To this end, three high-performance sources are developed, each of them taking extensively advantage of standard telecom fibre optics components. The first source generates polarization entanglement via deterministic pair separation in two adjacent telecommunication channels. This source is naturally suitable for quantum cryptography in wavelength multiplexed network structures. The second source generates for the first time a cross time-bin entangled bi-photon state which allows for quantum key distribution tasks using only passive analyzers. The third source generates, with a record efficiency, polarization entanglement using an energy-time to polarization entanglement transcriber. The photon spectral bandwidth can be chosen over more than five orders of magnitude (25 MHz - 4 THz). This permits implementing the source into existing telecom networks, but also in advanced quantum relay and quantum memory applications. Moreover, this source is used to revisit Bohr’s single-photon wave-particle complementarity notion via employing a Mach-Zehnder interferometer with an output quantum beam-splitter in a true superposition of being present and absent. Finally, to adapt the wavelength of the entangled telecom photon pairs to the absorption wavelength of current quantum memories, a coherent wavelength converter is presented and discussed
McKeever, Jason Terence Taylor Kimble H. Jeff. "Trapped atoms in cavity QED for quantum optics and quantum information /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-06032004-163753.
Повний текст джерелаMichelberger, Patrick Steffen. "Room temperature caesium quantum memory for quantum information applications." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:19c9421d-0276-4c6d-a641-7640d2981da3.
Повний текст джерелаManzoni, Marco Tommaso. "New systems for quantum nonlinear optics." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461495.
Повний текст джерелаLos fotones que viajan por el espacio libre no interactúan entre sí. Esta característica los hace perfectos candidatos para transportar la información cuántica a largas distancias. Por otro lado, el procesamiento de la información que codifican requiere mecanismos de interacción. En los últimos años se han realizado esfuerzos crecientes para realizar interacciones fuertes y controladas entre los fotones y para comprender las leyes subyacentes que describen los fenómenos que pueden surgir, generando así el nuevo campo de la "óptica cuántica no lineal". Mientras que los materiales tridimensionales tienen coeficientes no lineales extremadamente débiles, se pueden obtener interacciones entre los fotones haciéndolos interactuar con átomos individuales, que son objetos intrínsecamente no lineales, teniendo la capacidad de absorber únicamente un solo fotón a la vez. La realización de interacciones determinísticas entre fotones y átomos es uno de los principales retos de la óptica cuántica no lineal. Para eludir las limitaciones debidas a la pequeña sección eficaz óptica de los átomos y el límite de difracción en el espacio libre, se han aplicado diferentes estrategias, entre ellas el uso de cavidades (CQED), de colectividades atómicas y, más recientemente, de nanoestructuras dieléctricas capaces de confinar la luz sin desenfocarse, permitiendo así la interacción con átomos atrapados en la proximidad de esas estructuras. Mientras que para el caso de la CQED se han desarrollado potentes herramientas teóricas para tratar las interacciones de los fotones, en el caso de colectividades atómicas hay una falta general de métodos teóricos más allá del régimen lineal. Esta relativa falta de comprensión también implica que podría haber nuevos fenómenos físicos interesantes que hasta ahora no se han identificado. El objetivo general de esta tesis es explorar estos temas con mayor detalle. En el capítulo 2 de esta tesis desarrollamos un nuevo formalismo para calcular las propiedades de la luz cuántica cuando interactúa con sistemas atómicos. El método consiste en utilizar un"`modelo de espines" que mapea un problema de propagación de luz cuasi unidimensional (1D) a la dinámica de un sistema abierto unidimensional de espines que interactúan entre sí, donde todas las correlaciones de fotones se obtienen a partir de las de los espines. La dinámica de los espines se puede resolver numéricamente utilizando la caja de herramientas de los estados producto de matrices (MPS), proporcionando así una técnica para estudiar los fotones que interactúan fuertemente en el regimen de la física de muchos cuerpos. En el capítulo 3 se investiga la posibilidad de crear fases exóticas de la materia utilizando la interfaz entre guía de ondas de cristales fotónicos (PCW) y átomos recientemente realizada experimentalmente, donde los modos de la banda de frecuencias prohibidas de la PCW se utilizan para mediar las interacciones de largo alcance entre los átomos. Encontramos un rico diagrama de fases de órdenes emergentes. En el capítulo 4 se investiga la posibilidad de implementar procesos ópticos cuánticos no lineales de segundo orden con nano-estructuras de grafeno, como una alternativa más robusta al uso de sistemas atómicos. Cuantificamos las propiedades no lineales de segundo orden, mostrando que el estrecho confinamiento da lugar a extraordinarias fuerzas de interacción a nivel de un solo fotón y predecimos que un diseño apropiado de las nano-estructuras del grafeno permitiría generar el segundo armónico con una eficiencia comparable a la de los cristales no lineales de última generación. En el capítulo 5, investigamos cómo la emisión cooperativa en memorias cuánticas realizadas con reticulos atómicos afecta su eficiencia, encontrando el impresionante resultado de que una memoria realizada con 16 átomos puede tener la misma eficiencia que un gas cuántico atómico de profundidad óptica mayor que 100.
Berman, D. Ballester. "Quantum optics in tightly confining media." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546007.
Повний текст джерелаStensson, Katarina. "Quantum Optics in 2D Nonlinear Lattices." Thesis, KTH, Tillämpad fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145893.
Повний текст джерелаRodgers, Peter A. "Time-dependent pulses in quantum optics." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356924.
Повний текст джерелаTarzi, S. "Dissipation and amplification in quantum optics." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47271.
Повний текст джерелаPhoenix, Simon James Daniel. "Entropy and disorder in quantum optics." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46503.
Повний текст джерелаLight, Philip Stephen. "Photonic microcells for quantum optics applications." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512327.
Повний текст джерелаClark, Paul. "Quantum optics of electrons in graphene." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/416896/.
Повний текст джерелаOser, Dorian. "Integrated silicon photonics for quantum optics." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS455.
Повний текст джерелаSilicon photonics is a dynamic research field of integrated optics. It allows to miniaturize numerous optical functionalities such as lasers, electro-optical modulators, routers, detectors, for telecom wavelengths, LIDAR, sensor, metrology or even spectroscopy, all while been able to propose large scale production high precision technologies. On another side, quantum optics suffers from difficulties to scale optical systems, requires extreme stability, perfect alignment, and many bulky optical elements, while solving these issues follows a natural path in integrated photonics. Development of integrated quantum photonics can thus open the door to cheap, powerful, and scalable systems for quantum cryptography, telecoms, and computation. In a significant way, quantum requirements are not the ones of classical circuits with respect to photonic components and circuits. The generation of quantum states indeed requires more than 100dB of pump laser rejection, while being able to manage ultra-low useful optical signals and get rid of on-chip optical noise. In this context, this thesis is dedicated to the study, dimension, realization, and characterization of silicon photonic components and circuits for quantum optics on a chip. The target goal is to generate entangled states in energy-time and manipulate them on chip. The qualification of the quantum properties is also explored to better understand the limitations of the silicon platform in the followed objectives. Another choice of this work is to stay in telecoms wavelength and aligned with the standard channels (ITU grid), to only use off-the-shelf components, all while been CMOS compatible and compliant with standard fabrication process, this to allow the possibility to produce on large scale
Dhayal, Suman. "Nonlinear and Quantum Optics Near Nanoparticles." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822820/.
Повний текст джерелаOskay, Windell Haven. "Atom optics experiments in quantum chaos." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3040634.
Повний текст джерелаHinzer, Karin. "Optical properties of gallium arsenide-based self-assembled quantum dots and quantum dot lasers." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6055.
Повний текст джерелаCapelle, Thibault. "Electromechanical cooling and parametric amplification of an ultrahigh-Q mechanical oscillator." Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUS045.
Повний текст джерелаIn this thesis, we have studied an ultrahigh quality factor mechanical oscillator coupled to a microwave cavity. We will present an original technique to probe the losses of planar microwave cavities, as well as a resolved sideband cooling technique to actively cool this mechanical oscillator using the microwave cavity. Finally, we will present some optimizations of this experiment which open the path towards the ground state cooling of the mechanical oscillator. Such a hybrid quantum system could be used as an on-chip quantum memory, able to store fragile quantum states generated by superconducting quantum circuits for coherence times approaching a second
Devitt, Simon John. "Quantum information engineering : concepts to quantum technologies /." Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00003925.
Повний текст джерелаLoock, Peter van. "Quantum communication with continuous variables." Thesis, Bangor University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368766.
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