Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-01-11
Phys. Rev. B 77, 115304(2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
21 pages, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.115304
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 a 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.
Çakir Özgür
Takagahara Toshihide
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