Dissipative dynamics of coupled quantum dots under quantum measurement

Details Dissipative dynamics of coupled quantum dots under quantum measurement Dissipative dynamics of coupled quantum dots under quantum measurement

2005-11-15

arxiv.org/abs/cond-mat/0511370v2

J. Phys.: Condens. Matter 18, 11551 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 2 figures

Scientific paper

10.1088/0953-8984/18/50/010

We have studied the dissipative dynamics of a solid-state qubit with an extra electron confined to either one of two coupled quantum dots. Previous theoretical work based on Bloch-type rate equations gave an unphysical uniform occupation probability of the electron in the quantum dots even for non-identical dots. We show that this is due to neglecting higher order interactions in the analysis. By including higher order terms, we obtain expected asymmetric occupation probabilities for non-identical dots. Our work demonstrates that the high order interaction terms can lead to important qualitative impacts on the operation of the qubit.

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