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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"Nuclear spins"”.
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Optical Control over Nuclear Spins
… scalability is highly desirable. Particularly, nuclear spins have been considered as ideal quantum information carriers thanks to their exceptionally long coherence time exceeding minutes and even hours at room temperature. However, the application of nuclear spins is hindered by their small …
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Polarization of Nuclear Spins in Metallic Systems
Submitted by Jenny Wong-Welch (wongwel2@illinois.edu) on 2013-07-18T18:34:49Z No. of bitstreams: 1 1954_carver.pdf: 2859215 bytes, checksum: f2ea5922c31e8098016dcbc890096151 (MD5)
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Computational dynamics of classical nuclear spins in solids
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1990.
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Spin Coupling in Radio Frequency Spectroscopy: A. The Electron Coupling of Nuclear Spins. B. The Coupling of Electron and Nuclear Spins
Made available in DSpace on 2014-12-05T19:37:06Z (GMT). No. of bitstreams: 1 5901997.pdf: 3898653 bytes, checksum: 503fc7d951ccaf5a8774d37fc47e4411 (MD5) Previous issue date: 1959
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Coherent control of hyperfine-coupled electron and nuclear spins for quantum information processing
Coupled electron-nuclear spins are promising physical systems for quantum information processing: By combining the long coherence times of the nuclear spins with the ability to initialize, control, and measure the electron spin state, the favorable properties of each spin species are utilized. This …
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Spin-spin couplings in two limits : experimental, theoretical, and computational studies of dipole-coupled nuclear spins in solids
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1994.
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SPECTROSCOPIC STUDIES OF NUCLEAR SPINS POLARIZED VIA SPIN EXCHANGE OPTICAL PUMPING AND DYNAMIC COUPLING IN CRYPTOPHANE HOST-GUEST COMPLEXES
… results largely from extremely small (Boltzmann) nuclear spin polarization at thermal equilibrium--in even the strongest of magnets. This dissertation focuses on selected research areas that maybe used to combat the limitations presented by NMR and measure weak spectral responses with atomic-scale …
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'Amplifying' the NMR signatures of host-guest interactions and molecular structure using liquid-crystalline matrices and polarization enhancement of nuclear spins
Nuclear magnetic resonance (NMR) spectroscopy has been extensively used to investigate the structure and dynamics of host-guest systems. NMR spectroscopy has gained attention because of its high spectral information content for studies of molecules in the solid state and in solution. However, the …
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RF instrumentation and system design for coherent control of anisotropic hyperfine-coupled electron/nuclear spin qubits
… isolated electron spin to coherently control nuclear spins. Coupled electron/nuclear spins are a promising candidate for QIP: nuclear spins are used for information storage and computation due to their long coherence times, while the electron is used as a spin actuator for initialization, …
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Engineering coherent control of quantum information in spin systems
… in the context of magnetic resonance for: (i) nuclear spins of small molecules in solution and (ii) nuclear and electron spins in single crystals. The power of QIP is compromised in the presence of decoherence. One method of protecting information from collective decoherence is to limit the …
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Quantum Information Processing with Color Center Qubits: Theory of Initialization and Robust Control
… the coherence time limit. Moreover, the nearby nuclear spins have long coherence times suitable for quantum memories. In this thesis, I present a theoretical understanding of and control protocols for various color centers. Using group theory, I explore the wave functions and laser …
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Super-resolution localization and readout of individual solid-state qubits
… a spin center that can be entangled to multiple nuclear spins. Scaling these systems will require the entanglement of multiple NV centers, together with their nuclear spins, in a manner that allows for individual control and readout. Here we demonstrate a technique that allows us to prepare and …
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Application of compressional cooling to the study of nuclear ordering in solid helium three
… for He3 has been used to observe ordering of the nuclear spins in solid He3 He3 atoms in the solid are localized at lattice sites. Interactions between neighboring atoms, due to zero point motion, are relatively small until temperatures in the low I millidegree Kelvin range are reached. Liquid He …
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Photonic integration of electron-nuclear spin systems in semiconductor quantum dots
… light-matter interface of an electron and the nuclear spins within an optically active QD. Here we integrate the electron-nuclear spin system of a semiconductor QD into an open microcavity. We report progress on three fronts towards the generation of multidimensional photonic cluster states: …
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Optimal Control Protocols for Quantum Memory Network Applications
… optically active electronic spin and long-lived nuclear spins for information storage. The first part of this dissertation is concerned with error mechanisms in the control of electronic and nuclear spins. First, I will focus on control protocols for improved electron-spin rotations tailored to …
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A tale of two interfaces: photons and spins linked by a solid-state artificial atom
… coherence of the surrounding environment of nuclear spins. This dissertation presents a series of experiments which address some of the challenges of exploiting quantum dots for quantum technologies. First, we implement a new technique for performing coherent control of a spin confined to a …
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Hyperfine Interaction of the Group IV Color Centers
… transitions, as well as native electron and nuclear spins that can be used as quantum memories. While the optical and electronic properties of these defects have been studied extensively in previous works, a detailed theory of the hyperfine coupling to the nuclear spin is lacking. This work …
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Spingineering : quantum control in the presence of relaxation
… the feasibility of our correction schemes using nuclear magnetic resonance. We also demonstrate control of the nuclear spins over long time scales. Finally, we discuss the applications of unitary correction to higher dimensional systems and the potential applications to quantum information …
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Classical and quantum control in nanosystems
… 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 …
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Investigation of lateral gated quantum devices in Si/SiGe heterostructures
… decoherence times, due to the low density of nuclear spins and weak coupling between nuclear and electronic spins. Because of this, they are excellent candidates for use as solid state qubits. The initial approach towards creating controllable Si/SiGe quantum dots was to fabricate them in …
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