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    NTHUR > College of Electrical Engineering and Computer Science > Department of Electrical Engineering > EE Journal / Magazine Articles  >  Graphene quantum dots for valley-based quantum computing: A feasibility study

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    Title: Graphene quantum dots for valley-based quantum computing: A feasibility study
    Authors: G. Y. Wu;N.-Y. Lue;L. Chang
    Teacher: 吳玉書
    Date: 2011
    Publisher: American Physical Society
    Relation: PHYSICAL REVIEW B, American Physical Society, Volume 84, Issue 19, NOV 28 2011, Article Number 195463
    Keywords: COMPUTATION
    Abstract: The rise of graphene opens a door to qubit implementation, as discussed in the recent proposal of valley pair qubits in double quantum dots of gapped graphene (G. Y. Wu, N.-Y. Lue, and L. Chang, arXiv:1104.0443). The work here presents the comprehensive theory underlying the proposal. It discusses the interaction of electrons with external magnetic and electric fields in such structures. Specifically, it examines a strong, unique mechanism, i.e., the analog of the first-order relativistic effect in gapped graphene. This mechanism is state mixing free and allows, together with electrically tunable exchange coupling, a fast, all-electric manipulation of qubits via electric gates, in the time scale of ns. The work also looks into the issue of fault tolerance in a typical case, yielding at 10 K a long qubit coherence time [similar to O(ms)].
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    Appears in Collections:[Department of Electrical Engineering] EE Journal / Magazine Articles
    [Institute of Electronics Engineering ] ENE Journal / Magazine Articles
    [Department of Physics] PHYS Journal / Magazine Articles

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