Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Controlled operations in a strongly correlated two-electron quantum ring
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. (Atomic Physics)
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. (Atomic Physics)ORCID-id: 0000-0003-3444-1317
Department of Physics and Technology, University of Bergen, N-5020 Bergen, Norway. (Atomic Physics)
Department of Physics and Technology, University of Bergen, N-5020 Bergen, Norway.
2009 (Engelska)Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, nr 11, s. 115318-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We have analyzed the electronic spectrum and wave-function characteristics of a strongly correlated two-electron quantum ring with model parameters close to those observed in experiments. The analysis is based on an exact diagonalization of the Hamiltonian in a large B-spline basis. We propose a qubit pair for storing quantum information, where one component is stored in the total electron spin and one multivalued “quMbit” is represented by the total angular momentum. In this scheme the controlled-NOT quantum gate is demonstrated with near 100% fidelity for a realistic far-infrared electromagnetic pulse.

Ort, förlag, år, upplaga, sidor
American Physical Society , 2009. Vol. 79, nr 11, s. 115318-
Nyckelord [en]
Quantum Rings, Quantum Dots, Electron structure, Electron correlation, Configuration Interaction, Quantum Computing, quantum gates, CNOT, Controlled operations, angular momentum, electron spin, quantum entanglement, strongly correlated electron systems, wave functions
Nationell ämneskategori
Atom- och molekylfysik och optik Annan fysik Den kondenserade materiens fysik Den kondenserade materiens fysik
Forskningsämne
fysik
Identifikatorer
URN: urn:nbn:se:su:diva-32133DOI: 10.1103/PhysRevB.79.115318ISI: 000264768900100OAI: oai:DiVA.org:su-32133DiVA, id: diva2:279548
Tillgänglig från: 2010-01-25 Skapad: 2009-12-04 Senast uppdaterad: 2022-02-25Bibliografiskt granskad
Ingår i avhandling
1. On the role of the electron-electron interaction in two-dimensional quantum dots and rings
Öppna denna publikation i ny flik eller fönster >>On the role of the electron-electron interaction in two-dimensional quantum dots and rings
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Many-Body Perturbation Theory is put to test as a method for reliable calculations of the electron-electron interaction in two-dimensional quantum dots. We show that second order correlation gives qualitative agreement with experiments on a level which was not found within the Hartree-Fock description. For weaker confinements, the second order correction is shown to be insufficient and higher order contributions must be taken into account. We demonstrate that all order Many-Body Perturbation Theory in the form of the Coupled Cluster Singles and Doubles method yields very reliable results for confinements close to those estimated from experimental data. The possibility to use very large basis sets is shown to be a major advantage compared to Full Configuration Interaction approaches, especially for more than five confined electrons.

Also, the possibility to utilize two-electron correlation in combination with tailor made potentials to achieve useful properties is explored. In the case of a two-dimensional quantum dot molecule we vary the interdot distance, and in the case of a two-dimensional quantum ring we vary the ring radius, in order to alter the spectra. In the latter case we demonstrate that correlation in combination with electromagnetic pulses can be used for the realization of quantum logical gates.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physics, Stockholm University, 2010. s. 99
Nyckelord
quantum dot, quantum ring, quantum dot molecule, electronic structure, two-dimensional, many-body physics, many-body perturbation theory, coupled cluster, coupled cluster singles and doubles, quantum logical gates, quantum computing, quantum control, quantum control algorithm
Nationell ämneskategori
Den kondenserade materiens fysik
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:su:diva-38862 (URN)978-91-7447-086-4 (ISBN)
Disputation
2010-06-02, FB52, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Manuscript.Tillgänglig från: 2010-05-11 Skapad: 2010-05-02 Senast uppdaterad: 2022-02-24Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltext

Person

Waltersson, ErikLindroth, Eva

Sök vidare i DiVA

Av författaren/redaktören
Waltersson, ErikLindroth, Eva
Av organisationen
Fysikum
I samma tidskrift
Physical Review B. Condensed Matter and Materials Physics
Atom- och molekylfysik och optikAnnan fysikDen kondenserade materiens fysikDen kondenserade materiens fysik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 77 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf