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

Meunier, T. ; Tielrooij, K.-J. ; Vink, I. T ; Koppens, F. H. L. ; Tranitz, Hans-Peter ; Wegscheider, Werner ; Kouwenhoven, Leo P. ; Vandersypen, L. M. K.
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Date of publication of this fulltext: 25 Jan 2010 13:36


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.


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