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Dissertations / Theses on the topic 'Quantum space'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Schiavon, Matteo. "Space Quantum Communication." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3422779.

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The primary role played by communication in our society gives importance to the problem of securely transmitting sensitive information. Quantum physics can be exploited to solve this problem in a more secure way than it is possible by using classical protocols. The application of quantum physics to communication tasks is the basis of the new quantum communication field, of which quantum cryptography represents the most successful achievement. Quantum communication, however, suffers the presence of losses much more than classical communication. The high level of losses in fiber-based system

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2

Appleby, David Marcus. "Quantum mechanics on phase space." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267642.

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3

Afriat, Alexander. "Quantum waves in configuration space." Thesis, London School of Economics and Political Science (University of London), 1999. http://etheses.lse.ac.uk/2085/.

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The thesis deals with issues in the foundations of quantum mechanics, having to do with configuration space, the physical reality of quantum waves, additive conservation and EPR experiments. After a historical sketch of optical theories, concentrating on the dual nature of light, the passage from Hamilton's optico-mechanical analogy to wave mechanics is looked at. The wave-particle duality of de Broglie's theorie de la double solution is favoured after comparison with some of Schrodinger's views. Three experiments are considered which support that realist duality by indicating corpuscular and

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4

Vedovato, Francesco. "Quantum Optics Experiments in Space." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3424875.

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Space has always been a primary source of inspiration for the development of the scientific, technological, artistic, philosophical and religious thinking of the whole humankind. Space explorations marked the history of the XX century, bringing an incredible technological advancement and allowing to investigate the natural phenomena over scales and into details which are simply not available on Earth. Nowadays, the Space is the benchmark of the new quantum revolution, which promises to change the way we communicate, measure and calculate, thank to the exploitation and the control of what happe

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5

Das, Bata Krishna. "Quantum stochastic analysis in Banach space and operator space." Thesis, Lancaster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.660115.

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6

Hodges, Peter John. "Quantum aspects of target space duality." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327612.

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7

Gorman, Philip Michael. "Practical free-space quantum key distribution." Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2390.

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Within the last two decades, the world has seen an exponential increase in the quantity of data traffic exchanged electronically. Currently, the widespread use of classical encryption technology provides tolerable levels of security for data in day to day life. However, with one somewhat impractical exception these technologies are based on mathematical complexity and have never been proven to be secure. Significant advances in mathematics or new computer architectures could render these technologies obsolete in a very short timescale. By contrast, Quantum Key Distribution (or Quantum Cryptogr

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8

Tomasevic, Marija. "Quantum Aspects of Space and Time." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/672688.

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In this thesis, we explore different ways in which spacetime exhibits peculiar properties when subjected to the rules of quantum mechanics. These rules are naturally implemented at the level of semiclassical physics, where the dynamical nature of the spacetime metric is neglected. In particular, we explore how quantum effects modify some of the fundamental statements of General Relativity, ranging from different possible solutions, such as traversable wormholes and time machines, to some of the more foundational conjectures, with an emphasis to the one of cosmic censorship. Chapter One takes

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9

Fürstberger, Silke. "Quantum billiards in reduced phase space." UIm : Universität Ulm, Fakultät für Naturwissenschaften, 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10976231.

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10

Panati, Gianluca. "Space-adiabatic Decoupling in Quantum Dynamics." Doctoral thesis, SISSA, 2002. http://hdl.handle.net/20.500.11767/4744.

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In many physical situations, separation of scales plays a fundamental role in understanding the dynamical behavior of the system. In particular, we focus on physical systems in which it is possible to distinguish between fast and slow degrees of freedom. The goal is to obtain an effective Schrodinger equation governing the dynamics of the slow degrees of freedom, thereby greatly simplifying the complexity of the problem. The previous lines summarize the spirit and the goals of the theory outlined in this thesis. The thesis collects original results obtained as a joint work with Herbert

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11

Bacco, Davide/DB. "Quantum communications between Earth and Space." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3423903.

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In this society people are always connected, and everyday they manage a lot of personal data also risking to be eavesdropped. Quantum science is one the most promising field of the next years, from quantum computing to quantum communications and above all quantum cryptography. Quantum cryptography is the first commercial application of quantum physics and moreover it results one of the most reliable solution for security problem. Using Quantum Physic law's it is possible to establish secure communications between two users, guaranteeing unconditionally security in the transmission of dat

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12

Arzano, Michele Ng Yee Jack. "Aspects of quantum gravity quantum space-time and black hole thermodynamics /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,144.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.<br>Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics & Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.

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13

Tomaello, Andrea. "Quantum communication channels between earth and space and space to earth." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422086.

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The work presented in this thesis, on the topics of global quantum network, is the result of a set of research activities done at the CNR-IFN Luxor laboratory over these three years. The main goal that we would reach is the feasibility demonstration of quantum communication in free-space, without excluding from the definition "free space" any possible scenario. This is the way that in the future may lead to a global quantum network all over the world, that involves satellites and earth station. We may identify three major link families, that should help the reader to classify the research acti

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14

Schmitt-Manderbach, Tobias. "Long distance free-space quantum key distribution." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-81020.

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15

Hadhrami, Hilal Al. "Phase space methods in finite quantum systems." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4250.

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Quantum systems with finite Hilbert space where position x and momentum p take values in Z(d) (integers modulo d) are considered. Symplectic tranformations S(2ξ,Z(p)) in ξ-partite finite quantum systems are studied and constructed explicitly. Examples of applying such simple method is given for the case of bi-partite and tri-partite systems. The quantum correlations between the sub-systems after applying these transformations are discussed and quantified using various methods. An extended phase-space x-p-X-P where X, P ε Z(d) are position increment and momentum increment, is introduced. In thi

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16

Šafránek, Dominik. "Gaussian quantum metrology and space-time probes." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37124/.

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In this thesis we focus on Gaussian quantum metrology in the phase-space formalism and its applications in quantum sensing and the estimation of space-time parameters. We derive new formulae for the optimal estimation of multiple parameters encoded into Gaussian states. We discuss the discontinuous behavior of the figure of merit -- the quantum Fisher information. Using derived expressions we devise a practical method of finding optimal probe states for the estimation of Gaussian channels and we illustrate this method on several examples. We show that the temperature of a probe state affects t

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17

Kirchner, Ulrich. "A space-time approach to quantum mechanics." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/14639.

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Includes bibliographical references.<br>We present a systematic development and application of Geometric Algebra, an extended vector calculus. The entire algebraic structure, which is a graded Clifford algebra, is developed. To illustrate the derived results, examples are given for two and three dimensions. Here it becomes clear, how rotations and Lorentz boosts can be formulated in the Geometric Algebra. Further we realize that the Geometric Algebra contains elements, which can be used as representations of the complex unit. Having derived the necessary tools, we turn our attention to physics

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18

Sharp, Paul. "The metric space approach to quantum mechanics." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/11134/.

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The metric space approach to quantum mechanics is a new, powerful method for deriving metrics for sets of quantum mechanical functions from conservation laws. We develop this approach to show that, from a standard form of conservation law, a universal method exists to generate a metric for the physical functions connected to that conservation law. All of these metric spaces have an "onion-shell" geometry consisting of concentric spheres, with functions conserved to the same value lying on the same sphere. We apply this approach to generate metrics for wavefunctions, particle densities, paramag

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19

Capraro, Ivan. "Advanced Techniques in Free Space Quantum Communication." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425561.

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The main argument of this thesis is the application of advanced techniques for the optimization of single photon communication and in general of single photon applications. The work is inserted in the contest of various projects that involve the departments of Information Engineering and Astronomy of the University of Padua. In particular my contribution has been the development of a quantum cryptography setup that we called QuAKE. The system has been designed and implemented in our labs and include in the hardware some advanced temporal and spatial filtering techniques. These features has b

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20

Calcinari, Andrea. "Loop quantum gravity: quantum space and new coherent states from twisted geometries." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20474/.

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La Gravità Quantistica a Loop (LQG) raffigura il concetto di spazio come un oggetto quantistico. Predice infatti una nozione discreta e quantizzata di geometria, la quale deve essere riconciliata in qualche modo con l’idea classica di spazio. L’intento perseguito nel redigere questa tesi è quello di fornire uno strumento utile a studiare questa riconciliazione, il quale è dato dal risultato originale di una nuova famiglia di stati coerenti. La LQG segue un approccio non perturbativo, dando valore alle lezioni chiave della GR: indipendenza da un background e covarianza generale. La struttura c

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21

Hersent, Kilian. "Field theories on quantum space-times : towards the phenomenology of quantum gravity." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP031.

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La géométrie noncommutative est un formalisme mathématique qui exprime la structure de l’espace-temps avec des algèbres d’opérateurs. On s’attend à ce que les espace-temps noncommutatifs fassent émerger des effets de gravité quantiques, au moins dans un certain régime, notamment parce qu’ils utilisent les outils de la mécanique quantique pour décrire la géométrie. Ce manuscrit se concentre sur les aspects physiques de ces espace-temps quantiques, tout particulièrement à travers le formalisme des théories de champs et de jauge. Il est montré que les théories de champs scalaires engendrent possi

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22

Jofre, Cruanyes Marc. "Integrated photonic transmitters for secure space quantum communication." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/117469.

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An important issue in today's information society is the security of data transmission against potential intruders, which always put at risk the confidentiality. Current methods to increase security require that the two parties wishing to transmit information, exchange or share one or more security keys. Once the key has been identified, the information can be transferred in a provable secure way using a one-time pad, i. e. the key length is as long as the plaintext. Therefore, the security of the information transmission is based exclusively on the security of the key exchange. Quantum crypto

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23

Michler, Matthias. "Quantum signatures of partial barriers in phase space." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-77211.

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Generic Hamiltonian systems have a mixed phase space, in which regular and chaotic motion coexist. In the chaotic sea the classical transport is limited by partial barriers, which allow for a flux \Phi given by the corresponding turnstile area. Quantum mechanically the transport is suppressed if Planck's constant is large compared to the classical flux, h >> \Phi, while for h << \Phi classical transport is recovered. For the transition between these limiting cases there are many open questions, in particular concerning the correct scaling parameter and the width of the transition.

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24

Špalek, Robert. "Quantum algorithms, lower bounds and time-space tradeoffs)." Amsterdam : Amsterdam : Institute for Logic, Language and Computation ; Universiteit van Amsterdam [Host], 2006. http://dare.uva.nl/document/27681.

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25

Fürstberger, Silke [Verfasser]. "Quantum billiards in reduced phase space / Silke Fürstberger." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2004. http://d-nb.info/1015438369/34.

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26

Qubain, Edward George. "A quantum phase space with classical time evolution /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008424.

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27

Gibbs, James Michael. "Spacetime as a quantum graph." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/29195.

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28

Bonifacio, Paolo. "Spacetime conformal fluctuations and quantum dephasing." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=33587.

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29

Dall'Arche, Alberto. "Advanced techniques for quantum communications in free-space channels." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424543.

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This thesis is focused on the development of advanced techniques for quantum communications in free-space channels. At present there are several demonstrations of quantum communication protocols at long distances, many of these exploit optical fiber as transmission channel. The optical fiber is very advantageous in that it is scarcely influenced by external conditions and allows to connect remote localities that are not in direct line of sight. On the other hand, it presents strong limitations in transmission distance because of dispersion and attenuation. It is therefore necessary to explor

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30

Parker, Stephen. "Quantum information protocols on pure and mixed states." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252204.

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31

Kalasuwan, Pruet. "Optical quantum information processing in higher dimensional Hilbert space." Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573150.

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In this thesis, we present and demonstrate several schemes for linear optical quantum information processing. Our schemes access. a higher-dimensional Hilbert space in order to simplify some particular quantum information tasks. We show how to expand a polarization-encoded cluster state by accessing and manipulating its spatial degree of freedom. This is realized using a polarization- path controlled-phase gate. We invented a method of adding control to quantum operations by accessing a higher dimensional Hilbert space, significantly reducing the complexity of some quantum circuits. A key adva

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32

Quiñones, Valles Diego A. "Detection of space-time perturbations with quantum-enhanced metrology." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/19249/.

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We present a new model of atomic decoherence by space-time perturbations. We propose that decoherence will arise as a result of two possible effects that gravitational fluctuations will have on the atom. One is that the nucleus will be displaced relative to the valence electron, which will be perceived as a sudden change in the electric potential. This will result in the wave function of the atom being partially projected into lower energy levels. The other is that the strain in space will change the local electric field as felt by the electron. This interaction will either induce a change in

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33

Guha, Saikat 1980. "Classical capacity of the free-space quantum-optical channel." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/87908.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>MIT Institute Archives copy has MIT Research Laboratory of Electronics t.p.<br>Also issued with MIT Research Laboratory of Electronics t.p. preceding thesis t.p.<br>Includes bibliographical references (leaves 114-116).<br>Exploring the limits to reliable communication rates over quantum channels has been the primary focus of many researchers over the past few decades. In the present work, the classical information carrying capacity of the free-space quantum optical channel has b

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34

Yune, Jiwon. "Secure communication through free-space channel using quantum illumination." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91882.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 67).<br>Secure communication based on quantum illumination (QI) provides high-speed direct communication in the presence of loss and noise and is secure against passive eavesdropping. Recently, the QI based communication protocol has been demonstrated in a fiber channel. In this thesis, we extend the QI secure communication protocol to a free-space propagation channel. Unlike a fiber channe

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35

Wu, Shin-Tza. "Quantum electrodynamics in front of a dielectric half-space." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624491.

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36

Stanley, Ross James. "Quantum propagation and initial value problems in curved space." Thesis, Swansea University, 2012. https://cronfa.swan.ac.uk/Record/cronfa42356.

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Quantum field theory is studied within the semi-classical gravity approximation. The quantum correction to the propagation of both photons and gravitons in a general curved space background is calculated showing a non-trivial spacetime refractive index as well as a dynamical dressing (or undressing) of the particle state. The initial interacting particle's 'dressing', the cloud of virtual particles that surrounds it, may receive corrections from an infinite number of modes even for flat space. When gravitational tidal effects remove this dressing, squeezing it back into the bare particle, this

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37

Kent, Carl. "Quantum scalar field theory on anti-de Sitter space." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4911/.

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This thesis considers a real massive free quantum scalar field propagating with arbitrary coupling to $n$-dimensional anti-de Sitter space. Analytical expressions are found for the field modes and Feynman Green function. The condition for the equivalence of rotational vacuum states is also established. The rotational and thermal anti-commutator functions are then derived. A method is developed for computing the Hadamard renormalised vacuum and thermal expectation values of the quadratic field fluctuations and the stress-energy tensor. Results are obtained for $n=2$ to $n=11$, satisfying Wald's

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38

Galiautdinov, Andry. "Quantum theory of elementary processes." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/28007.

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39

Dickinson, Paul. "Approximate Private Quantum Channels." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2944.

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This thesis includes a survey of the results known for private and approximate private quantum channels. We develop the best known upper bound for ε-randomizing maps, <em>n</em> + 2log(1/ε) + <em>c</em> bits required to ε-randomize an arbitrary <em>n</em>-qubit state by improving a scheme of Ambainis and Smith [5] based on small bias spaces [16, 3]. We show by a probabilistic argument that in fact the great majority of random schemes using slightly more than this many bits of key are also ε-randomizing. We provide the first known nontrivial lower bound

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40

Goldstein, Kevin. "De Sitter space, interacting quantum field theory and alpha vacua /." View online version; access limited to Brown University users, 2005. http://wwwlib.umi.com/dissertations/fullcit/3174611.

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41

Ludwig, Thomas. "Wick Rotation for Quantum Field Theories on Degenerate Moyal Space." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-118795.

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In dieser Arbeit wird die analytische Fortsetzung von Quantenfeldtheorien auf dem nichtkommutativen Euklidischen Moyal-Raum mit kommutativer Zeit zu entsprechenden Moyal-Minkowski Raumzeit (Wick Rotation) erarbeitet. Dabei sind diese Moyal-Räume durch eine konstante Nichtkommutativiät gegeben. Einerseits wird die Wick Rotation im Kontext der algebraischen Quantenfeldtheorie, ausgehend von einer Arbeit von Schlingemann, hergeleitet. Von einem Netz Euklidischer Observablen wird die Lorentz’sche Theorie durch alle Bilder der fortgesetzten Poincare Gruppenwirkung auf der Zeit-Null Schicht erhalten

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42

Brooks, Martin George. "Quantum spectral stochastic integrals and levy flows in Fock space." Thesis, Nottingham Trent University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266915.

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43

Walker, W. R. "Particle and energy creation in curved space ?quantum field theory." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354407.

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Wang, Lina. "Symplectic transformations and entanglement in finite quantum systems." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/3344.

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Quantum systems with finite Hilbert space are considered. Position and mo- mentum states and their relation through a Fourier transform, displacement in the position-momentum phase-space, and symplectic transformations are introduced and their properties are studied. Symplectic Sp(2l;Zp) trans- formations in l-partite finite system are explicit constructed. The general method is applied to bi-partite and tri-partite systems. The effect of these transformations on the correlations is discussed. Entanglement calculations between the subsystems in a bi-partite system and a tri-partite system are

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Raji, Rufai Odutayo. "Nonlinear low frequency wave phenomena in space plasmas." Thesis, University of the Western Cape, 2013. http://hdl.handle.net/11394/4036.

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Philosophiae Doctor - PhD<br>In this thesis, using multispecies fluid plasma models, nonlinear electrostatic solitary wave fluctuations will be investigated in magnetized plasmas. The different models used for the investigation will be guided by the satellite observations in different regions of the Earth magnetosphere. These investigations will enable us to attempt theoretical explanations for the nonlinear potential structures observed in the satellite data. Multispecies plasma consisting of cool and hot electrons with Maxwellian distributions and fluid ions will be considered to study low f

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Ono, Koki. "Two-Orbital Quantum Gases in an Optical Lattice: Interorbital Spin-Exchange Dynamics and Spin-Space Quantum Transport." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263444.

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47

Lees, Eitan Jacob. "Suppression of Collective Quantum Jumps of Rydberg Atoms due to Collective Spontaneous Emission from Atoms in Free Space." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438276591.

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48

Cain, Philipp. "Real space renormalization group approach to the integer quantum Hall effect." Doctoral thesis, [S.l. : s.n.], 2004. http://archiv.tu-chemnitz.de/pub/2004/0099.

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Huish, Gary John. "Renormalization of interacting quantum field theory in three dimensional curved space." Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240852.

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Kuns, Kevin A. "Future Networks of Gravitational Wave Detectors| Quantum Noise and Space Detectors." Thesis, University of California, Santa Barbara, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13810824.

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<p> The current network of three terrestrial interferometric gravitational wave detectors have observed ten binary black holes and one binary neutron star to date in the frequency band from 10 Hz to 5 kHz. Future detectors will increase the sensitivity by up to a factor of 10 and will push the sensitivity band down to lower frequencies. However, observing sources lower than a few Hz requires going into space where the interferometer arms can be longer and where there is no seismic noise. A new 100 km space detector, TianGO, sensitive to the frequency band from 10 mHz to 100 Hz is described. Th

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