Quantum Information Protectorates in Coupled Quantum Dot Exchange Gates

Details Quantum Information Protectorates in Coupled Quantum Dot Exchange Gates Quantum Information Protectorates in Coupled Quantum Dot Exchange Gates

2003-11-19

arxiv.org/abs/cond-mat/0311463v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

Using exact diagonalization we study the low energy Hilbert space of the two-electron, two-quantum dot artificial molecule under a perpendicular magnetic field. We show that electrons bind to vortices to induce several spin transitions among ground states. Furthermore, the lowest excited states of either even or odd vorticity mix, opening an anticrossing which protects the quantum information stored in the spin states of the strongly correlated quantum dot molecule.

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