Measurement efficiency and n-shot read out of spin qubits

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dc.creatorEngel, Hans-Andreas
dc.creatorGolovach, Vitaly
dc.creatorLoss, Daniel
dc.creatorVandersypen, L. M. K.
dc.creatorElzerman, J. M.
dc.creatorHanson, R.
dc.creatorKouwenhoven, L. P.
dc.date2003-09-01
dc.date.accessioned2026-07-07T02:53:13Z
dc.date.available2026-07-07T02:53:13Z
dc.descriptionWe consider electron spin qubits in quantum dots and define a measurement efficiency e to characterize reliable measurements via n-shot read outs. We propose various implementations based on a double dot and quantum point contact (QPC) and show that the associated efficiencies e vary between 50% and 100%, allowing single-shot read out in the latter case. We model the read out microscopically and derive its time dynamics in terms of a generalized master equation, calculate the QPC current and show that it allows spin read out under realistic conditions.
dc.description5 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/cond-mat/0309023
dc.identifierhttp://arxiv.org/abs/cond-mat/0309023
dc.identifierPhys. Rev. Lett. 93, 106804 (2004)
dc.identifierdoi:10.1103/PhysRevLett.93.106804
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22131
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleMeasurement efficiency and n-shot read out of spin qubits
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