Role of metastable charge states in a quantum-dot spin-qubit readout

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.92.125434
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TypeArticle
Journal titlePhysical Review B: Condensed Matter and Materials Physics
ISSN1098-0121
Volume92
Issue12
Article number125434
AbstractReadout of a spin qubit in a lateral gate-defined quantum-dot device typically involves a charge detector and a spin-to-charge conversion technique employing spin blockade. We investigate alternative mechanisms for spin-to-charge conversion involving metastable excited charge states made possible by an asymmetry in the tunneling rates to the leads. This technique is used to observe Landau-Zener-Stückelberg oscillations of the S-T+ qubit within the (1,0) ground state region of the charge stability diagram. The oscillations are π phase shifted relative to those detected using the standard technique and display a nonsinusoidal waveform due to the increased relaxation time from the metastable state.
Publication date
PublisherAmerican Physical Society
LanguageEnglish
AffiliationNational Research Council Canada; Security and Disruptive Technologies; Information and Communication Technologies
Peer reviewedYes
NPARC number21276979
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Record identifierf4131486-e99f-4642-a8ac-5d1b8c2f8f6a
Record created2015-11-10
Record modified2016-05-09
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