https://doi.org/10.1140/epjb/e2009-00369-x
The dynamics of a double-dot charge qubit embedded in a suspended phonon cavity
Department of Physics, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China
Corresponding author: a williamwallace@sjtu.edu.cn
Received:
11
June
2009
Revised:
29
September
2009
Published online:
31
October
2009
We theoretically investigate the dynamics of a double dot charge qubit that is embedded inside a suspended semiconductor slab in terms of a perturbation treatment based on a unitary transformation. The phonon-induced decoherence is analyzed in detail after a derivation of phonon spectral density. It is shown that a charge qubit of high quality can be obtained due to the inhibition of the electron-phonon coupling in the confined structure of the slab.
PACS: 73.21.La – Quantum dots / 63.20.kd – Phonon-electron interactions / 03.65.Yz – Decoherence; open systems; quantum statistical methods / 62.25.-g – Mechanical properties of nanoscale systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
