Rozprawy doktorskie na temat „Classical physics”
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Chambers, Chris M. "Classical aspects of black hole physics". Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294892.
Pełny tekst źródłaBeamond, Eleanor. "Quantum and classical localisation". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249185.
Pełny tekst źródłaDi, Criscienzo Roberto. "Semi-classical aspect of black hole physics". Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/367865.
Pełny tekst źródłaDi, Criscienzo Roberto. "Semi-classical aspect of black hole physics". Doctoral thesis, University of Trento, 2011. http://eprints-phd.biblio.unitn.it/627/1/PhD_v2.pdf.
Pełny tekst źródłaVrinceanu, Daniel. "Quantal-classical correspondence in atomic collisions". Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/28035.
Pełny tekst źródłaSylvester, Igor Andrade. "Efficient classical simulation of spin networks". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36112.
Pełny tekst źródłaIncludes bibliographical references (p. 45).
In general, quantum systems are believed to be exponentially hard to simulate using classical computers. It is in these hard cases where we hope to find quantum algorithms that provide speed up over classical algorithms. In the paradigm of quantum adiabatic computation, instances of spin networks with 2-local interactions could hopefully efficiently compute certain problems in NP-complete. Thus, we are interested in the adiabatic evolution of spin networks. There are analytical solutions to specific Hamiltonians for 1D spin chains. However, analytical solutions to networks of higher dimensionality are unknown. The dynamics of Cayley trees (three binary trees connected at the root) at zero temperature are unknown. The running time of the adiabatic evolution of Cayley trees could provide an insight into the dynamics of more complicated spin networks. Matrix Product States (MPS) define a wavefunction anzatz that approximates slightly entangled quantum systems using poly(n) parameters. The MPS representation is exponentially smaller than the exact representation, which involves 0(2n) parameters. The MPS Algorithm evolves states in the MPS representation.
(cont.) We present an extension to the DMRG algorithm that computes an approximation to the adiabatic evolution of Cayley trees with rotationally-symmetric 2-local Hamiltonians in time polynomial in the depth of the tree. This algorithm takes advantage of the symmetry of the Hamiltonian to evolve the state of a Cayley tree exponentially faster than using the standard DMRG algorithm. In this thesis, we study the time-evolution of two local Hamiltonians in a spin chain and a Cayley tree. The numerical results of the modified MPS algorithm can provide an estimate on the entropy of entanglement present in ground states of Cayley trees. Furthermore, the study of the Cayley tree explores the dynamics of fractional-dimensional spin networks.
by Igor Andrade Sylvester.
S.B.
Rudner, Mark S. (Mark Spencer). "Classical and quantum control in nanosystems". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45443.
Pełny tekst źródłaIncludes bibliographical references (p. 189-202).
The central claim of this thesis is that nanoscale devices offer a platform to study and demonstrate new forms of control over both quantum and classical degrees of freedom in solid-state systems. To support this claim, I present a series of theoretical discussions that demonstrate how static and/or time-varying fields can be used to control spin degrees of freedom in GaAs quantum dots. This work is motivated by recent experiments in single and double quantum dots that have demonstrated many interesting phenomena arising from the coupled dynamics of electron and nuclear spins. In addition, I will present some results on the control of superconducting flux qubits, obtained in collaboration with the Orlando group at MIT. The control techniques discussed in this thesis may help provide new directions for experimental research on nuclear spin dynamics in solids, and may be applied to help enable future spintronics or quantum information processing tasks.
by Mark S. Rudner.
Ph.D.
Saizar, Pedro. "Multiwavelength studies of classical nova shells /". The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780865408208.
Pełny tekst źródłaKlales, Anna. "A Classical Perspective on Non-Diffractive Disorder". Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:26718765.
Pełny tekst źródłaPhysics
Cotton, Stephen Joshua. "Symmetrical Windowing for Quantum States in Quasi-Classical Trajectory Simulations". Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686249.
Pełny tekst źródłaAn approach has been developed for extracting approximate quantum state-to-state information from classical trajectory simulations which "quantizes" symmetrically both the initial and final classical actions associated with the degrees of freedom of interest using quantum number bins (or "window functions") which are significantly narrower than unit-width. This approach thus imposes a more stringent quantization condition on classical trajectory simulations than has been traditionally employed, while doing so in a manner that is time-symmetric and microscopically reversible.
To demonstrate this "symmetric quasi-classical" (SQC) approach for a simple real system, collinear H + H2 reactive scattering calculations were performed [S.J. Cotton and W.H. Miller, J. Phys. Chem. A 117, 7190 (2013)] with SQC-quantization applied to the H 2 vibrational degree of freedom (DOF). It was seen that the use of window functions of approximately 1/2-unit width led to calculated reaction probabilities in very good agreement with quantum mechanical results over the threshold energy region, representing a significant improvement over what is obtained using the traditional quasi-classical procedure.
The SQC approach was then applied [S.J. Cotton and W.H. Miller, J. Chem. Phys. 139, 234112 (2013)] to the much more interesting and challenging problem of incorporating non-adiabatic effects into what would otherwise be standard classical trajectory simulations. To do this, the classical Meyer-Miller (MM) Hamiltonian was used to model the electronic DOFs, with SQC-quantization applied to the classical "electronic" actions of the MM model—representing the occupations of the electronic states—in order to extract the electronic state population dynamics. It was demonstrated that if one ties the zero-point energy (ZPE) of the electronic DOFs to the SQC windowing function's width parameter this very simple SQC/MM approach is capable of quantitatively reproducing quantum mechanical results for a range of standard benchmark models of electronically non-adiabatic processes, including applications where "quantum" coherence effects are significant. Notably, among these benchmarks was the well-studied "spin-boson" model of condensed phase non-adiabatic dynamics, in both its symmetric and asymmetric forms—the latter of which many classical approaches fail to treat successfully.
The SQC/MM approach to the treatment of non-adiabatic dynamics was next applied [S.J. Cotton, K. Igumenshchev, and W.H. Miller, J. Chem. Phys., 141, 084104 (2014)] to several recently proposed models of condensed phase electron transfer (ET) processes. For these problems, a flux-side correlation function framework modified for consistency with the SQC approach was developed for the calculation of thermal ET rate constants, and excellent accuracy was seen over wide ranges of non-adiabatic coupling strength and energetic bias/exothermicity. Significantly, the "inverted regime" in thermal rate constants (with increasing bias) known from Marcus Theory was reproduced quantitatively for these models—representing the successful treatment of another regime that classical approaches generally have difficulty in correctly describing. Relatedly, a model of photoinduced proton coupled electron transfer (PCET) was also addressed, and it was shown that the SQC/MM approach could reasonably model the explicit population dynamics of the photoexcited electron donor and acceptor states over the four parameter regimes considered.
The potential utility of the SQC/MM technique lies in its stunning simplicity and the ease by which it may readily be incorporated into "ordinary" molecular dynamics (MD) simulations. In short, a typical MD simulation may be augmented to take non-adiabatic effects into account simply by introducing an auxiliary pair of classical "electronic" action-angle variables for each energetically viable Born-Oppenheimer surface, and time-evolving these auxiliary variables via Hamilton's equations (using the MM electronic Hamiltonian) in the same manner that the other classical variables—i.e., the coordinates of all the nuclei—are evolved forward in time. In a complex molecular system involving many hundreds or thousands of nuclear DOFs, the propagation of these extra "electronic" variables represents a modest increase in computational effort, and yet, the examples presented herein suggest that in many instances the SQC/MM approach will describe the true non-adiabatic quantum dynamics to a reasonable and useful degree of quantitative accuracy.
Wang, Yao-Ting. "Novel wave phenomena in classical vibrations". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7952/.
Pełny tekst źródłaLuna, Godoy Andres. "The double copy and classical solutions". Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/8716/.
Pełny tekst źródłaChism, William Wesley. "Nonlinear classical dynamics in intense laser-atom physics /". Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Pełny tekst źródłaChen, Chen. "Quantum and Classical Manifestation of Hamiltonian Monodromy". W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1516639669.
Pełny tekst źródłaBreuer, Thomas. "Classical observables, measurement, and quantum mechanics". Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339726.
Pełny tekst źródłaPittman, Suzanne Michelle. "The Classical-Quantum Correspondence of Polyatomic Molecules". Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493526.
Pełny tekst źródłaPhysics
Andreev, Anton. "Random matrices, quantum chaos and irreversible classical dynamics". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/36086.
Pełny tekst źródłaSchmidt, Jan Hendrik. "From perfect predictability to causal indeterminism in classical physics". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624807.
Pełny tekst źródłaGundlach, C. "Classical and quantum scalar fields in cosmology". Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240140.
Pełny tekst źródłaBenassi, Costanza. "On classical and quantum lattice spin systems". Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/108566/.
Pełny tekst źródłaHan, Pin 1967. "Chaotic dynamics in classical and quantum mechanical systems". Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282102.
Pełny tekst źródłaTuohino, S. (Sasu). "Analysis of nonlinear dynamics in a classical transmon circuit". Bachelor's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201711223138.
Pełny tekst źródłaAlmaas, Eivind. "Topics in the theory of quantum and classical networks /". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486402957195756.
Pełny tekst źródłaDellow, Mark Winston. "Quantum and classical transport in semiconductor nanostructures". Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334765.
Pełny tekst źródłaJohnson, Mark R. "Molecular rotation and the quantum-classical transition". Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334785.
Pełny tekst źródłaDewald, Andrew S. "Semi-Classical Analysis of One-Dimensional Power- Plus Inverse-Power-Law Potentials". Ohio University Honors Tutorial College / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1461689832.
Pełny tekst źródłaRomero-Rochin, Victor Manuel. "Brownian motion and weak coupling in classical and quantum systems". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14383.
Pełny tekst źródłaLue, Arthur. "Topological structure in classical and quantum SU(2)-Higgs theories". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10373.
Pełny tekst źródłaGallego, Juan. "Two specific applications of semi-classical theories in nuclear physics". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41592.
Pełny tekst źródłaOreborn, Ulf. "IR spectroscopy for vibrational modes : A semi-classical approach based on classical electrodynamicsand modern quantum mechanics". Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-78144.
Pełny tekst źródłaTill minne av Ulf Oreborn (1957-2018)
Bromley, Thomas R. "Navigating the quantum-classical frontier". Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43333/.
Pełny tekst źródłaCornell, Brennan. "An introduction to classical gauge theory in mathematics and physics". Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27583.
Pełny tekst źródłaLundberg, Erik. "Problems in Classical Potential Theory with Applications to Mathematical Physics". Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3220.
Pełny tekst źródłaGravanis, Elias. "Topics in D-membrane physics and membrane inspired classical gravity". Thesis, King's College London (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441973.
Pełny tekst źródłaAtkins, Keith Michael. "Non-linearity and chaos in simple classical quantum systems". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302809.
Pełny tekst źródłaSmart, Sheila Ann. "The interaction between non-classical light and atomic systems". Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317525.
Pełny tekst źródłaKimpton, Ian. "Classical and quantum modifications of gravity". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13430/.
Pełny tekst źródłaSchoellmann, Volker. "Quantum classical interactions of a superconducting quantum interference device". Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264634.
Pełny tekst źródłaLin, Joseph Xiao. "Quantum blackjack : quantum strategies and advantages in games with limited classical communication". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120220.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (pages 59-60).
In this thesis, we examine the advantages that quantum strategies afford in communication-limited games. Inspired by the card game blackjack, we particularly focus on cooperative, two-party sequential games in which a single classical bit of communication is allowed from the first-mover to the late-mover. Within this setting, optimal usage of quantum entanglement is explored, and conditions of quantum advantage over classical strategies are examined. Furthermore, theoretical, computational, and experimental techniques are presented that can be useful in the analysis and implementation of quantum strategies in these types of games.
by Joseph Xiao Lin.
S.B.
Magill, Peter David. "Classical resonance in vibrationally inelastic collisions of diatomic molecules : experiments and modeling". Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14727.
Pełny tekst źródłaSpellmeyer, Neal W. (Neal Warren) 1970. "Rydberg atoms in an oscillating field : extracting classical motion from quantum spectra". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47410.
Pełny tekst źródłaDalzell, Alexander M. "Lower bounds on the classical simulation of quantum circuits for quantum supremacy". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111859.
Pełny tekst źródłaThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 91-93).
Despite continued experimental progress, no task has yet been performed on quantum technology that could not also have been performed quickly on today's classical computers. One proposed path toward achieving this milestone, which is often referred to as quantum supremacy, is to perform specific types of quantum circuits for which it is guaranteed, under plausible complexity theoretic conjectures, that any classical approximate weak simulation algorithm for these circuits must take more than polynomial time. Instantaneous quantum (IQP) circuits and Quantum Approximate Optimization Algorithm (QAOA) circuits are examples of circuits with this guarantee under the assumption that the polynomial hierarchy (PH) does not collapse. However, these arguments do not communicate how large these quantum circuits must be built before simulating them is hard in practice. We show how a fine-grained version of this assumption involving the PH leads to a fine-grained lower bound on the simulation time for IQP and QAOA circuits. Using the lower bound, we conclude that IQP circuits must contain roughly 1700 qubits, and QAOA circuits must contain roughly 7100 qubits before their simulation would be guaranteed to be intractable on today's fastest supercomputers. Additionally, we apply the same logic to find an asymptotic lower bound on the classical weak simulation of Clifford + T circuits with n qubits, m Clifford gates, and t T gates, concluding that any simulation with runtime of the form poly(n;m)2[gamma]t must have [gamma] > 1/135 [approximately equal] 0:0074. The best existing algorithm of this form [gamma] [approximately equal] 0:228.
by Alexander M. Dalzell.
S.B.
Marshall, Richard John. "Semi classical description of a finite temperature Bose Einstein condensate". Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249508.
Pełny tekst źródłaYu, Lin-Yu. "Aspects of deterministic chaos in classical and quantum mechanical systems". Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186219.
Pełny tekst źródłaQubain, 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.
Pełny tekst źródłaHarrow, Aram (Aram Wettroth) 1980. "Applications of coherent classical communication and the Schur transform to quantum information theory". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34973.
Pełny tekst źródłaThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 167-176).
Quantum mechanics has led not only to new physical theories, but also a new understanding of information and computation. Quantum information not only yields new methods for achieving classical tasks such as factoring and key distribution but also suggests a completely new set of quantum problems, such as sending quantum information over quantum channels or efficiently performing particular basis changes on a quantum computer. This thesis contributes two new, purely quantum, tools to quantum information theory-coherent classical communication in the first half and an efficient quantum circuit for the Schur transform in the second half. The first part of this thesis (Chapters 1-4) is in fact built around two loosely overlapping themes. One is quantum Shannon theory, a broad class of coding theorems that includes Shannon and Schumacher data compression, channel coding, entanglement distillation and many others. The second, more specic, theme is the concept of using unitary quantum interactions to communicate between two parties. We begin by presenting new formalism: a general framework for Shannon theory that describes communication tasks in terms of fundamental information processing resources, such as entanglement and classical communication. Then we discuss communication with unitary gates and introduce the concept of coherent classical communication, in which classical messages are sent via some nearly unitary process. We find that coherent classical communication can be used to derive several new quantum protocols and unify them both conceptually and operationally with old ones.
(cont.) Finally, we use these new protocols to prove optimal trade-o curves for a wide variety of coding problems in which a noisy channel or state is consumed and two noiseless resources are either consumed or generated at some rate. The second half of the thesis (Chapters 5-8) is based on the Schur transform, which maps between the computational basis of (Cd)n and a basis (known as the Schur basis) which simultaneously diagonalizes the commuting actions of the symmetric group Sn and the unitary group Ud. The Schur transform is used as a subroutine in many quantum communication protocols (which we review and further develop), but previously no polynomial-time quantum circuit for the Schur transform was known. We give such a polynomial-time quantum circuit based on the Clebsch-Gordan transform and then give algorithmic connections between the Schur transform and the quantum Fourier transform on Sn.
by Aram Wettroth Harrow.
Ph.D.
Kobayashi, Kohjiro. "Topics in classical and quantum phase transitions". Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1199254396.
Pełny tekst źródłaSmith, Mark James. "Quasi-classical theory of weakly anisotropic superconductors". Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3297/.
Pełny tekst źródłaGodskesen, Simon. "Geometric Phases in Classical and Quantum Systems". Thesis, Uppsala universitet, Teoretisk fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388414.
Pełny tekst źródłaTanaka, Kaori. "Shell structure and classical orbits in mesoscopic systems". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30172.pdf.
Pełny tekst źródła