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Exquisite quantum control has now been achieved in small ion traps, innitrogen-vacancy centres and in superconducting qubit clusters. We can regardsuch a system as a universal cell with diverse technological uses fromcommunication to large-scale computing, provided that the cell is able tonetwork with others and overcome any noise in the interlinks. Here we show thatloss-tolerant entanglement purification makes quantum computing feasible withthe noisy and lossy links that are realistic today: With a modestly complexcell design, and using a surface code protocol with a network noise thresholdof 13.3%, we find that interlinks which attempt entanglement at a rate of 2MHzbut suffer 98% photon loss can result in kilohertz computer clock speeds (i.e.rate of high fidelity stabilizer measurements). Improved links woulddramatically increase the clock speed. Our simulations employed local gates ofa fidelity already achieved in ion trap devices.

Freely Scalable Quantum Technologies using Cells of 5-to-50 Qubits with Very Lossy and Noisy Photonic Links