Quantum interference between three two-spin states in a double quantum dot

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.108.226802
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume108
Issue22
Article number226802
SubjectCoherence time; Density matrix; Double quantum dots; Interference patterns; Quantum interference; Singlet state; Theoretical prediction; Two-qubit; Experiments; Quantum computers; Quantum interference devices; Semiconductor quantum dots; Current voltage characteristics
AbstractQubits based on the singlet (S) and the triplet (T 0, T +) states in double quantum dots have been demonstrated in separate experiments. It has been recently proposed theoretically that under certain conditions a quantum interference could occur from the interplay between these two qubit species. Here we report experiments and modeling that confirm these theoretical predictions and identify the conditions under which this interference occurs. Density matrix calculations show that the interference pattern manifests primarily via the occupation of the common singlet state. The S/T 0 qubit is found to have a much longer coherence time as compared to the S/T + qubit. © 2012 American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies; Measurement Science and Standards; Information and Communication Technologies
Peer reviewedYes
NPARC number21269263
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Record identifier818ad410-f9af-483a-93fa-8feaf267f262
Record created2013-12-12
Record modified2016-05-09
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