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Effect of electron-nuclear spin interactions for electron-spin qubits localized in InGaAs self-assembled quantum dots

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dc.contributor.author Lee, Seungwon
dc.contributor.author Allmen, Paul von
dc.contributor.author Oyafuso, Fabiano
dc.contributor.author Klimeck, Gerhard
dc.contributor.author Whaley, K. Birgitta
dc.date.accessioned 2006-06-06T21:49:17Z
dc.date.available 2006-06-06T21:49:17Z
dc.date.issued 2005-02-15
dc.identifier.citation Journal of Applied Physics 97, 043706 s2005d, doi: 10.1063/1.1850605g en
dc.identifier.clearanceno 04-3616
dc.identifier.uri http://hdl.handle.net/2014/39293
dc.description.abstract The effect of electron-nuclear spin interactions on qubit operations is investigated for a qubit represented by the spin of an electron localized in an InGaAs self-assembled quantum dot. The localized electron wave function is evaluated within the atomistic tight-binding model. The electron Zeeman splitting induced by the electron-nuclear spin interaction is estimated in the presence of an inhomogeneous environment characterized by a random nuclear spin configuration, by the dot-size distribution, alloy disorder, and interface disorder. Due to these inhomogeneities, the electron Zeeman splitting varies from one qubit to another by the order of 10(-6), 10(-6), 10(-7), and 10(-9) eV, respectively. Such fluctuations cause errors in exchange operations due to the inequality of the Zeeman splitting between two qubits. However, the error can be made lower than the quantum error threshold if an exchange energy larger than 10(-4) eV is used for the operation. This result shows that the electron-nuclear spin interaction does not hinder quantum-dot based quantum computer architectures from being scalable even in the presence of inhomogeneous environments. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 114468 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher American Institute of Physics. en
dc.subject Quantum computers (QC) en
dc.subject qubits en
dc.subject quantum dots en
dc.title Effect of electron-nuclear spin interactions for electron-spin qubits localized in InGaAs self-assembled quantum dots en
dc.type Article en


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