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 10 of 10 for “"quantum decoherence"”.
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Explorations of quantum decoherence phenomena
… thesis describes the experimental exploration of quantum decoherence using discrete and continuous-time decoherence maps. The experimental methodology uses liquid-state nuclear magnetic resonance spectroscopy techniques. Initially, a brief discussion of coherent control methods is given. Then, a …
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Decoherence of Quantum Markov Systems
The main purpose of this thesis is to discuss quantum decoherence in the frame- work of operator algebras. We will define several types of decoherence of quantum Markov systems based on the original notion introduced by Ph. Blanchard and R. Olkiewicz; then we will give a number of suffiecient …
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Non-destructive electron microscopy through interaction-free quantum measurement
… this thesis, the possibility of interaction-free quantum measurements with electrons is investigated. With a scheme based on existing charged particle trapping techniques, it is demonstrated that such interaction-free measurements are possible in the presence of previously measured quantum …
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Channel-adapted quantum error correction
Quantum error correction (QEC) is an essential concept for any quantum information processing device. Typically, QEC is designed with minimal assumptions about the noise process; this generic assumption exacts a high cost in efficiency and performance. We examine QEC methods that are adapted to the …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
The study of quantum interference in solid-state systems yields insight in fundamental properties of mesoscopic systems. Electron quantum interference constitutes an important method to explore mesoscopic physics and quantum decoherence. This dissertation focuses on two-dimensional (2D) electron …
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Matsubara Dynamics and its Practical Implementation
This thesis develops a theory for approximate quantum time-correlation functions, Matsubara dynamics, that rigorously describes how to combine quantum statistics with classical dynamics. Matsubara dynamics is based on Feynman's path integral formulation of quantum mechanics and is expected to …
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Quasicentroid Molecular Dynamics
We develop a theory for approximating quantum time-correlation functions using the classical dynamics of coordinates subject to thermally averaged Feynman path fluctuations (“the mean field”). This theory approximates the dynamics of systems at thermal equilibrium that follow quantum Boltzmann …
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Decoherence and Dynamical Decoupling in Solid-State Spin Qubits
This dissertation is a study of the decoherence of a solid-state spin qubit, either that of a localized electron spin or a donor nucleus, caused by a nuclear spin bath relevant to semiconductor quantum computer architectures. In the presence of an external magnetic field and at low temperatures, …
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Quantum-coherent transport in low-dimensional mesoscopic structures and thin films
This thesis experimentally studies quantum interference phenomena and quantum coherence in mesoscopic systems, and quantum transport as well as magnetotransport in various materials system. One overarching aim is exploring the different mechanisms that give rise to quantum phase decoherence in …
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Enhancing Fidelity through Gate Decomposition: A Strategy to Mitigate Quantum Crosstalk on NISQ Computers
<p>Quantum computing aims to tackle computationally intricate problems that are infeasible for classical computers. However, as quantum processors improve in scaling their sizes, their complexity also increases. Due to this complexity, there is a significant detrimental effect of quantum noise …