Greenberger-Horne-Zeilinger States in Quantum Dot Molecule

Details Greenberger-Horne-Zeilinger States in Quantum Dot Molecule Greenberger-Horne-Zeilinger States in Quantum Dot Molecule

2011-01-31

arxiv.org/abs/1102.0035v1

Phys. Rev. B 83, 125311 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures. Accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.83.125311

We present a microscopic theory of a lateral quantum dot molecule in a radial magnetic field with a Greenberger- Horne- Zeilinger (GHZ) maximally entangled three particle groundstate. The quantum dot molecule consists of three quantum dots with one electron spin each forming a central equilateral triangle. The anti-ferromagnetic spin-spin interaction is changed to the ferromagnetic interaction by additional doubly occupied quantum dots, one dot near each side of a triangle. The magnetic field is provided by micro-magnets. The interaction among the electrons is described within an extended Hubbard Hamiltonian and electronic states are obtained using configuration interaction approach. The set of parameters is established for which the ground state of the molecule in a radial magnetic field is well approximated by a GHZ state.

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