Non-destructive measurement of electron spins in a quantum dot

Details Non-destructive measurement of electron spins in a quantum dot Non-destructive measurement of electron spins in a quantum dot

2006-03-29

arxiv.org/abs/cond-mat/0603794v1

Phys. Rev. B 74, 195303 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.74.195303

We propose and implement a non-destructive measurement that distinguishes between two-electron spin states in a quantum dot. In contrast to earlier experiments with quantum dots, the spins are left behind in the state corresponding to the measurement outcome. By measuring the spin states twice within a time shorter than the relaxation time, T1, correlations between consecutive measurements are observed. They disappear as the wait time between measurements become comparable to T1. The correlation between the post-measurement state and the measurement outcome is measured to be ~90% on average.

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