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26 April 2024

» arxiv » cond-mat/0612178

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High fidelity measurement of singlet-triplet states in a quantum dot
T. Meunier ; K-J. Tielrooij ; I. T. Vink ; F. H. L. Koppens ; H. P. Tranitz ; W. Wegscheider ; L. P. Kouwenhoven ; L. M. K. Vandersypen ;
Date:	7 Dec 2006
Journal:	physica status solidi (b), Vol. 243/15/2006, page 3855-3858
Subject:	Mesoscopic Systems and Quantum Hall Effect
Abstract:	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.
Source:	arXiv, cond-mat/0612178
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