  We propose a quantum dot architecture for enabling universal quantum
information processing. Quantum registers, consisting of arrays of vertically
stacked self-assembled semiconductor quantum dots, are connected by chains of
in-plane self-assembled dots. We propose an entanglement distributor, a device
for producing and distributing maximally entangled qubits on demand,
communicated through in-plane dot chains. This enables the transmission of
entanglement to spatially separated register stacks, providing a resource for
the realisation of a sizeable quantum processor built from coupled register
stacks of practical size. Our entanglement distributor could be integrated into
many of the present proposals for self-assembled quantum dot-based quantum
computation. Our device exploits the properties of simple, relatively short,
spin-chains and does not require microcavities. Utilizing the properties of
self-assembled quantum dots, after distribution the entanglement can be mapped
into relatively long lived spin qubits and purified, providing a flexible,
distributed, off-line resource.
