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

Ying Yen Liao, Yueh Nan Chen, Sheng Rui Jian

Research output: Contribution to journalArticle

Abstract

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
Volume22
Issue number4
DOIs
Publication statusPublished - 2010 Jan 29

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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