Non-markovian dynamics of double quantum dot charge qubit with static bias

Details Non-markovian dynamics of double quantum dot charge qubit with static bias Non-markovian dynamics of double quantum dot charge qubit with static bias

2007-01-24

arxiv.org/abs/cond-mat/0701581v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.115301

The dynamics of charge qubit in double quantum dot coupled to phonons is investigated theoretically. The static bias is considered. By means of the perturbation approach based on unitary transformations, the dynamical tunneling current is obtained explicitly. The biased system displays broken symmetry and a significantly larger coherence-incoherence transition critical point $\alpha _{c}$. We also analyzed the decoherence induced by piezoelectric coupling phonons in detail. The results show that reducing the coupling between system and bath make coherence frequency increase and coherence time prolong. To maintain quantum coherence, applying static bias also is a good means.

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