Autonomous entanglement distribution of multi-qubit entanglement

Theorists at TU Wien and the Walther-Meißner-Institut have proposed and analyzed a scheme for distributing multi-qubit entanglement in a robust and fully autonomous way.  In their scheme, qubits arranged along two optical or microwave waveguides are illuminated by correlated photons from a common two-mode squeezing source. The researcher showed that this basic process drives the qubits into a multi-partite entangled steady state, with an entanglement pattern that can be conveniently adjusted by tuning the individual qubit frequency splittings. A detailed analysis of the scalability of this new quantum networking approach has now appeared on the preprint server arXiv (2306.16453).