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Nuclear-spin qubit interactions in a heterostructure can be mediated
via the bound outer electrons of impurity atoms whose nuclear spins 1/2 are the
qubits. These outer electrons, in turn, interact via the two-dimensional electron
gas in the quantum Hall effect regime. We devised a quantum computing scheme,
based on this mechanism, with qubit separation of order 0.1 µm, attainable with
the present-day semiconductor device technologies, and retaining all the
gate-control and measurement aspects of earlier nuclear-spin quantum computing
proposals.
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