Long-range entanglement and coherent qubit coupling via spin transport: implications for scalability

Solid state approaches to quantum computation offer intriguing prospects for large scale integration and long term stability. Most of the current approaches restrict the computation to nearest-neighbors interactions. This condition generally decreases thresholds for fault tolerant computation. We explore the prospects for improving the scalability of quantum dot-based quantum computation schemes via long range transport of electron spin entangled pairs. Specifically we investigate dominant sources of errors in such a transport and study techniques to purify and correct these errors. Finally, we discuss several approaches for long-lived storage of electronic spin qubits and investigate novel architectures that utilize these resources for scalable quantum computation.