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High fidelity measurement of singlet–triplet state in a quantum dot
Author(s) -
Meunier T.,
Tielrooij K.J.,
Vink I. T.,
Koppens F. H. L.,
Tranitz H. P.,
Wegscheider W.,
Kouwenhoven L. P.,
Vandersypen L. M. K.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200671503
Subject(s) - quantum dot , singlet state , spin (aerodynamics) , charge (physics) , physics , fidelity , high fidelity , spin states , triplet state , single shot , state (computer science) , energy (signal processing) , atomic physics , condensed matter physics , quantum mechanics , excited state , optics , computer science , algorithm , telecommunications , thermodynamics , acoustics
We demonstrate experimentally a read‐out method that distinguishes between two‐electron spin states in a quantum dot. This scheme combines the advantages of the two existing mechanisms for spin‐to‐charge conversion with single‐shot charge detection: a large difference in energy between the two states and a large difference in tunnel rate between the states and a reservoir. As a result, a spin measurement fidelity of 97% was achieved, which is much higher than previously reported fidelities. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)