High fidelity measurement of singlet-triplet states in a quantum dot

Details High fidelity measurement of singlet-triplet states in a quantum dot High fidelity measurement of singlet-triplet states in a quantum dot

2006-12-07

arxiv.org/abs/cond-mat/0612178v2

physica status solidi (b), Vol. 243/15/2006, page 3855-3858

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

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.

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