Angle-dependent decoherence of charge qubits in free-standing slabs

Ying Yen Liao, Yueh Nan Chen, Sheng Rui Jian

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We investigate the decoherence of a charge qubit in a double quantum dot which is formed in a free-standing semiconductor slab. The dots are spatially arranged to align along a particular direction. Confined phonons in the slab have a remarkable influence on the dynamics of a qubit system. We show that the decoherence of such a qubit strongly depends on the positions of the dots. By varying the tunnel coupling, the decoherence differs significantly in laterally and vertically coupled quantum dots. A robust qubit is further achieved due to suppression of electron-phonon coupling. Moreover, the coherent evolution of the system is analyzed by modulating the interdot direction.

Original languageEnglish
Article number045301
JournalJournal of Physics Condensed Matter
Issue number4
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics


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