Quantum dots: Applications in technology and in quantum physics

D. K. Ferry, J. P. Bird, R. Akis

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The description of a quantum dot can be applied to a great variety of structures, and their application has become important in a wide range of technical fields, for both optical and electronics applications. One of the earliest gate-defined lateral quantum dots was fabricated on a GaAs/AlGaAs heterojunction, in which a quasi-two-dimensional electron gas is formed on the GaAs side of the hetero-interface. We now know that these open dots remain quantum objects, a result that is useful if they are to be incorporated in any new type of information processing, such as has been suggested for quantum computation. Indeed, it is clear that a few robust states exist in these open dots, and that these states will lead to a signature of each dot through a set of reproducible "fluctuations" as the gate voltage, or a magnetic field is varied. These robust states provide a set of discrete pointer states, which govern the quantum to classical transition, and they are uncoupled from dots nearby in energy through the decoherence process.

Original languageEnglish (US)
Pages (from-to)298-302
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume25
Issue number2-3 SPEC.ISS.
DOIs
StatePublished - Nov 1 2004

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Keywords

  • Decoherence
  • Fluctuations
  • Pointer states
  • Quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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