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Coupled spin chains are promising candidates for 'wiring up' qubits insolid-state quantum computing (QC). In particular, two nitrogen-vacancy centersin diamond can be connected by a chain of implanted nitrogen impurities; whendriven by a suitable global fields the chain can potentially enable quantumstate transfer at room temperature. However, our detailed analysis of erroreffects suggests that foreseeable systems may fall far short of the fidelitiesrequired for QC. Fortunately the chain can function in the more modest role asa mediator of noisy entanglement, enabling QC provided that we use subsequentpurification. For instance, a chain of 5 spins with inter-spin distances of 10nm has finite entangling power as long as the T2 time of the spins exceeds 0.55ms. Moreover we show that re-purposing the chain this way can remove therestriction to nearest-neighbor interactions, so eliminating the need forcomplicated dynamical decoupling sequences.

Practicality of spin chain 'wiring' in diamond quantum technologies