Global ETD Search
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 57 for “"coherent control"”.
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Coherent control of neutron interferometry
… are proposed and demonstrated for measuring the coherent properties of materials and testing aspects of quantum information processing using a single crystal neutron interferometer. In particular we introduce methods for reciprocal space encoding of spatial information systematically in a neutron …
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Coherent control of quantum information
… computation requires the ability to efficiently control quantum information in the presence of noise. In this thesis, NMR quantum information processors (QIPs) are used to study noise processes that compromise coherent control, to develop useful techniques for detecting noise, and to explore …
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Coherent control of polarized neutron interferometry
In this thesis, we describe two sets of experiments using a single crystal neutron interferometer. First, we explore applications of quantum information processing (QIP) to magnetic materials characterization using polarized neutron interferometry (NI). We describe a split path spin-based …
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Coherent Control of Molecules for Quantum Computation
… vibrational or rotational quantum states are coherently controlled. An analysis is presented of quantum computation within the vibrational degrees of freedom of a polyatomic molecule. A set of 2n vibrational states covering a range of energies is used to encode n qubits in place of n separate …
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Measurement of a Weak Transition Moment Using Coherent Control
<p>We have developed a two-pathway Coherent Control technique for measurements of weak optical transition moments. We demonstrate this technique through a measurement of the transition moment of the highly-forbidden magnetic dipole transition between the 6s<sup>2</sup>S<sub>1/2</sub>1/2 and …
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Coherent Control of Molecular Dynamics with Shaped Femtosecond Pulses
Coherent control of molecular dynamics deals with the steering of quantum mechanical systems with suitably shaped ultrashort laser fields. The coherence properties of the laser field are exploited to achieve constructive interference for a predefined target wave function via a phasecorrect …
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Engineering coherent control of quantum information in spin systems
… thesis explores the requirements and methods of coherent control 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 …
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Coherent control of dipolar coupled spins in large Hilbert spaces
Controlling the dynamics of a dipolar-coupled spin system is critical to the development of solid-state spin-based quantum information processors. Such control remains challenging, as every spin is coupled to a large number of surrounding spins. In this thesis, we primarily focus on developing …
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Coherent control of Rydberg atoms using sub-kHz linewidth excitation lasers
… of sub-µm spatial resolution in the atom plane. Coherent control of atomic qubits has been achieved via fast rotations between long-lived hyperfine ground states as well as coherent Rydberg excitations towards the states 50S1/2, 69S1/2 and 81D5/2. The experiment allows us to control the atoms …
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Mechanisms of Intramolecular Vibrational Energy Redistribution and a Method for Coherent Control
Finally, a method for coherent control of reaction dynamics in large molecules is presented, in which IVR is dramatically slowed through the used of laser pulses that are easily produced with available pulse shaping equipment.
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Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy
… two dimensions and explores their application to coherent control of propagating lattice excitations and degenerate four-wave mixing spectroscopy. Pulse shaping in two dimensions is achieved by manipulating the spectral components of ultrashort laser pulses within many horizontal slices of the …
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Coherent control of hyperfine-coupled electron and nuclear spins for quantum information processing
… nuclear spins with the ability to initialize, control, and measure the electron spin state, the favorable properties of each spin species are utilized. This thesis discusses a procedure to initialize these nuclear spin qubits, and presents a vision of how these systems could be used as the …
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Coherent control of electron spins in diamond for quantum information science and quantum sensing
… introduces and experimentally demonstrates coherent control techniques to exploit electron spins in diamond for applications in quantum information processing and quantum sensing. Specifically, optically-detected magnetic resonance measurements are performed on quantum states of single and …
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Coherent control of nitrogen-vacancy centers in diamond nanostructures for quantum sensing and networking
… quantum network, we recently achieved coherent electron spin control of long-lived NV-s in diamond nanostructures using a transferrable hard-mask for both etching and ion implantation. We also developed a super-resolution imaging technique for characterizing such systems, and we …
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RF instrumentation and system design for coherent control of anisotropic hyperfine-coupled electron/nuclear spin qubits
Coherent control is a fundamental challenge in quantum information processing (QIP). Our system of interest employs a local, 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 …
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Investigations on resource-limited quantum control through NMR pulses
Universal high fidelity coherent control over large Hilbert spaces is essential for quantum information processing to become a useful tool in science, engineering, communications and computation. The development of methods for coherent control are however still in their infancy. In particular, very …
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Femtosekunden-Spektroskopie biologischer Systeme mittels kohärenter Kontrolle
… flow in complex systems, based on concepts of coherent control. By initiating a photoreaction with femtosecond pulses whose temporal phase and amplitude are shaped in such a manner that specific molecular vibrations and states are addressed, the energy flow can be steered at will. The …
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Quantum information processing with geometric phases, cavity magnonics, and semiconductor nanostructures
… Among these, we focus in this thesis on coherent control (the ability to manipulate quantum information), quantum information transduction (the conversion of quantum information), non-reciprocal behaviours, and the creation of non-classical states. Concerning coherent control, we examine …
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Coherent effects in wave propagation through complex media
… and the source of waves, enabling sensing and coherent control of the propagation. The nonlocal correlations and speckle statistics of the partially coherent light are used to uncover an object hidden by a diffusive cloak inside a strong scattering medium. It is shown that it is possible to …
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Short-visible-wavelength GHz Display
Applications such as quantum control, manufacturing, biology, and sensing require blue and ultraviolet light modulated in space and time. We propose and implement a strategy for fast, individual, coherent control of spatially-multiplexed channels at blue and ultraviolet wavelengths by combining an …
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