Luka Trifunovic, Fabio L. Pedrocchi, Daniel Loss
We propose a mechanism of long-range coherent coupling between spins coupled to a ferromagnet by exchnage or dipolar coupling. An effective two-spin interaction Hamiltonian is derived and the coupling strength is estimated. We also discuss mechanisms of decoherence and consider possibilities for gate control of the interaction between neighboring spin-qubits. The resulting quantum computing architecture retains all the single qubit gates and measurement aspects of earlier approaches, but allows qubit spacing at distances of order 1$\,\mu$m for two-qubit gates, achievable with current semiconductor technology. The clock speed depends strongly on the dimensionality of the ferromagnet and is between MHz and GHz.
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http://arxiv.org/abs/1302.4017
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