Geometric phases in semiconductor spin qubits: Manipulations and decoherence

Pablo San-Jose, Burkhard Scharfenberger, Gerd Schön, Alexander Shnirman, Gergely Zarand

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31 Citations (Scopus)

Abstract

We describe the effect of geometric phases induced by either classical or quantum electric fields acting on single electron spins in quantum dots in the presence of spin-orbit coupling. On one hand, applied electric fields can be used to control the geometric phases, which allows performing quantum coherent spin manipulations without using high-frequency magnetic fields. On the other hand, fluctuating fields induce random geometric phases that lead to spin relaxation and dephasing, thus limiting the use of such spins as qubits. We estimate the decay rates due to piezoelectric phonons and conduction electrons in the circuit, both representing dominant electric noise sources with characteristically differing power spectra.

Original languageEnglish
Article number045305
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number4
DOIs
Publication statusPublished - Jan 8 2008

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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