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Nuclear-Spin Induced Electron Spin Decoherence In Semiconductor Quantum dots

Nuclear-Spin Induced Electron Spin Decoherence In Semiconductor Quantum dots

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RIBEIRO, Hugo, 2012. Nuclear-Spin Induced Electron Spin Decoherence In Semiconductor Quantum dots [Dissertation]. Konstanz: University of Konstanz

@phdthesis{Ribeiro2012Nucle-19402, title={Nuclear-Spin Induced Electron Spin Decoherence In Semiconductor Quantum dots}, year={2012}, author={Ribeiro, Hugo}, address={Konstanz}, school={Universität Konstanz} }

terms-of-use Nuclear-Spin Induced Electron Spin Decoherence In Semiconductor Quantum dots 2012-06-04T06:07:32Z eng 2012 Ribeiro, Hugo Ribeiro, Hugo 2012-06-04T06:07:32Z In this thesis we consider fundamental problems in relation to the development of a quantum computer. Early on, it was postulated by researchers like Feynman and Deutsch that only a computer obeying quantum mechanical laws of physics would be efficient enough to simulate any physical system. Since then much effort has been made to build devices that would allow to coherently control a quantum two-level system or qubit (quantum bit), which is the quantum counterpart of a classical bit. Although remarkable achieve- ments have been made towards the ultimate goal of having a functional quantum computer, there are still several obstacles that must be overcome. One of these is decoherence induced via the interaction of the quantum two-level system with its environment.<br /><br />Here, we focus on spin-based quantum computing. It was proposed to confine electrons in electrically defined quantum dots and use their spin, a natural quantum two-level system, to encode information. One of the major problems with this approach is that if the quantum dot is made out of III-V semiconductor materials, like GaAs (as it is often the case in experimental implementations), then the spin of the electron interacts with the host nuclear spins via hyperfine interactions. This undesirable interaction leads to fast loss of coherence of the spin system turning it into a mere classical system. However, the situation is not as hopeless as it appears, since it is possible to increase coherence times by manipulating nuclear spins.

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