Charge qubit dynamics in a double quantum dot coupled to phonons

Details Charge qubit dynamics in a double quantum dot coupled to phonons Charge qubit dynamics in a double quantum dot coupled to phonons

2004-12-18

arxiv.org/abs/cond-mat/0412503v1

Phys. Rev. B 71, 205323 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 6 figures

Scientific paper

10.1103/PhysRevB.71.205323

The dynamics of charge qubit in a double quantum dot coupled to phonons is investigated theoretically in terms of a perturbation treatment based on a unitary transformation. The dynamical tunneling current is obtained explicitly. The result is compared with the standard perturbation theory at Born-Markov approximation. The decoherence induced by acoustic phonons is analyzed at length. It is shown that the contribution from deformation potential coupling is comparable to that from piezoelectric coupling in small dot size and large tunneling rate case. A possible decoupling mechanism is predicted.

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