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In this thesis, the dominant decoherence mechanisms of an electron spin qubit confined in an InGaAs quantum dot are identified using optical pump-probe spectroscopy. It is shown that at low magnetic fields the coherence time of the electron spin is reduced by combined effects of hyperfine and quadrupolar coupling. By employing higher-order spin correlators it is show that quantum phenomena are maintained up to microsecond timescales at magnetic fields exceeding the quadrupolar coupling strength.
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Quantum dynamics of spin qubits in optically active quantum dots, Alexander Bechtold
- Sprache
- Erscheinungsdatum
- 2017
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- Titel
- Quantum dynamics of spin qubits in optically active quantum dots
- Sprache
- Englisch
- Autor*innen
- Alexander Bechtold
- Verlag
- Verein zur Förderung des Walter Schottky Instituts der Technischen Universität München e.V.
- Erscheinungsdatum
- 2017
- ISBN10
- 3946379001
- ISBN13
- 9783946379003
- Kategorie
- Skripten & Universitätslehrbücher
- Beschreibung
- In this thesis, the dominant decoherence mechanisms of an electron spin qubit confined in an InGaAs quantum dot are identified using optical pump-probe spectroscopy. It is shown that at low magnetic fields the coherence time of the electron spin is reduced by combined effects of hyperfine and quadrupolar coupling. By employing higher-order spin correlators it is show that quantum phenomena are maintained up to microsecond timescales at magnetic fields exceeding the quadrupolar coupling strength.