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Double-occupancy errors, adiabaticity, and entanglement of spin qubits in quantum dots

Schliemann, J. and Loss, D. and MacDonald, A. H.. (2001) Double-occupancy errors, adiabaticity, and entanglement of spin qubits in quantum dots. Physical Review B, Vol. 63, H. 8 , 085311, 8 S..

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Official URL: http://edoc.unibas.ch/dok/A5254736

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Abstract

Quantum gates that temporarily increase singlet-triplet splitting in order to swap electronic spins in coupled quantum dots lead inevitably to a finite double-occupancy probability for both dots. By solving the time-dependent Schrodinger equation for a coupled dot model, we demonstrate that this does not necessarily lead to quantum computation errors, Instead. the coupled dot ground state evolves quasiadiabatically for typical system parameters so that the double-occupancy probability at the completion of swapping is negligibly small. We introduce a measure of entanglement that explicitly takes into account the possibilty of double occupancies and provides a necessary and sufficient criterion for entangled states.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:0163-1829
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:48

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