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

2006; Wiley; Volume: 243; Issue: 15 Linguagem: Inglês

10.1002/pssb.200671503

1521-3951

T. Meunier, Klaas‐Jan Tielrooij, I. T. Vink, Frank H. L. Koppens, H.-P. Tranitz, W. Wegscheider, L. P. Kouwenhoven, L. M. K. Vandersypen,

Advancements in Semiconductor Devices and Circuit Design

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.