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arXiv:cond-mat/0611314 · Physica E Low-dimensional Systems and Nanostructures

Quantum dynamics of electron–nuclei coupled system in quantum dots

Özgür Çakır, T. Takagahara

Published Jun 17, 2007• 1 citation
arXivHTMLPDF
DOI
10.1016/j.physe.2007.06.026

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We investigate quantum dynamics in the electron-nuclei coupled spin system in quantum dots and clarify the fundamental features of quantum correlation induced via successive electron-spin measurements. This quantum correlation leads to interesting phenomena such as the bunching of outcomes in the electron-spin measurements and the revival of an arbitrary initial electron-spin state. The nuclear spin system is also affected by the quantum correlation and is, in fact, squeezed via conditional measurements or postselection. This squeezing is confirmed by calculating the increase in the purity of the nuclear spin system. Thus, the successive electron-spin measurements provide a probabilistic method to squeeze the nuclear spin system. These new features are predicted not only for the case of double quantum dots occupied by a pair of electrons but also for the case of a single quantum dot occupied by a single electron or a pair of electrons.