On-demand All-to-All Coherent Network Among Distant Spin Ensembles

Realizing scalable all-to-all coherent connectivity is essential for next-generation distributed coherent computing, large-scale many-body simulation, and advanced coherent communication systems. We experimentally demonstrate a fully connected, on-demand selective coherent network between four distant spin ensembles mediated by resonant dipole–dipole interactions in a one-dimensional coplanar waveguide terminated by a ground mirror. By repositioning the spin ensembles, we further observe coherent energy exchange between multiple ensembles and demonstrate the scaling law in the time domain. This waveguide magnonic platform provides a versatile, medium-scale all-to-all coherent network with reconfigurable connectivity, enhancing large-scale coherent information processing and communication protocols.