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Estimation of the spatial decoherence time in circular quantum dots
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. B79, no 24, 245310- p.Article in journal (Refereed) Published
Abstract [en]

We propose a simple phenomenological model to estimate the spatial decoherence time in quantum dots. The dissipative phase space dynamicsis described in terms of the density matrix and the corresponding Wigner function, which are derived from a master equation with Lindblad operatorslinear in the canonical variables. The formalism was initially developed to describe diffusion and dissipation in deep inelastic heavy ioncollisions, but also an application to quantum dots is possible.It allows us to study the dependence of the decoherence rate on the dissipation strength, the temperature and an external magnetic field, which isdemonstrated in illustrative calculations on a circular GaAs one-electron quantum dot.

Place, publisher, year, edition, pages
2009. Vol. B79, no 24, 245310- p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:su:diva-29769DOI: 10.1103/PhysRevB.79.245310ISI: 000267699700086OAI: oai:DiVA.org:su-29769DiVA: diva2:235127
Available from: 2009-09-14 Created: 2009-09-14 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Resonances, dissipation and decoherence in exotic and artificial atoms
Open this publication in new window or tab >>Resonances, dissipation and decoherence in exotic and artificial atoms
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

There are several reasons why exotic and artificial atoms attract the interest of different scientific communities.In exotic atoms, matter and antimatter can coexist for surprisingly long times. Thus, they present a unique natural laboratory for high precision antimatter studies. In artificial atoms, electrons can be confined in an externally controlled way. This aspect is crucial, as it opens new possibilities for high precision measurements and also makes artificial atoms promising potential candidates for qubits, i.e. the essential bricks for quantum computation.The first part of the thesis presents theoretical studies of resonant states in antiprotonic atoms and spherical two-electron quantum dots, where well established techniques, frequently used for conventional atomic systems, can be applied after moderate modifications. In the framework of Markovian master equations, it is then demonstrated that systems containing resonant states can be approached as open systems in which the resonance width determines the environmental coupling. The second part of the thesis focuses on possible quantum computational aspects of two kinds of artificial atoms, quantum dots and Penning traps. Environmentally induced decoherence, the main obstacle for a practical realization of a quantum computer based on these devices, is studied within a simple phenomenological model. As a result, the dependence of the decoherence timescales on the temperature of the heat bath and environmental scattering rates is obtained.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 86 p.
Keyword
quantum dissipation, quantum decoherence, open quantum systems, resonances
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-38153 (URN)978-91-7447-027-7 (ISBN)
Public defence
2010-05-26, sal FR4, AlbaNova universitetscentrum, Roslagstullbacken 21, Stockholm, 13:15 (English)
Opponent
Supervisors
Available from: 2010-05-04 Created: 2010-03-29 Last updated: 2010-04-08Bibliographically approved

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