| Advantages |
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| 1. | Hyperfine interaction extremely well
defined parameter in |
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| Pure Si. Logic operations
determined strictly by timing. |
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| 2. Hyperfine interaction quadratic in
applied electric fields; |
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| charge switching doesn’t couple
strongly to qubits. |
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| 3. | Device sizes can
be much larger than Bohr radius. |
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| 4. | Logic needn’t
only be between nearest neighbors, |
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| allowing use of specialized devices
(logic vs measurement, |
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| etc.) |
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