Valley pair qubits in double quantum dots of gapped graphene

Details Valley pair qubits in double quantum dots of gapped graphene Valley pair qubits in double quantum dots of gapped graphene

2011-06-24

arxiv.org/abs/1106.4892v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

47 pages, 5 figures

Scientific paper

The rise of graphene opens a new door to qubit implementation, as discussed in the recent proposal of valley pair qubits in double quantum dots of gapped graphene (Wu et al., arXiv: 1104.0443 [cond-mat.mes-hall]). 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 analogue of the 1st-order relativistic effect in gapped graphene. This mechanism is state mixing free and allows, together with the 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 10oK a long qubit coherence time (~O(ms)).

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