Asymmetric Einstein-Podolsky-Rosen (EPR) steering is a peculiar phenomenon of some inseparable bipartite states, where two parties can disagree on whether the correlations are truly quantum mechanical or can be explained by a local hidden variable model. This can be useful, for example, in quantum communications or quantum cryptography.

In this work, Kun Wu and colleagues present a source of entangled microwave photons that can be tuned to produce asymmetric EPR states. They achieve such control by tuning the coupling between a fluxonium qubit and three superconducting resonators. Thanks to the solid state nature of this device, this work is a step toward a general, on-demand, multipartite entanglement source that can be embedded into compact devices and therefore become a standard component of a future quantum internet.

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