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 language | English (US) |
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Pages (from-to) | 298-302 |
Number of pages | 5 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 25 |
Issue number | 2-3 SPEC.ISS. |
DOIs | |
State | Published - Nov 2004 |
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