Realizing on-demand all-to-all selective interactions between distant spin ensembles

TL;DR

This paper demonstrates a method to create on-demand, all-to-all coherent interactions among distant spin ensembles using a resonant dipole-dipole coupling mediated by a coplanar waveguide, enabling scalable quantum networks.

Contribution

The authors experimentally realize a selective all-to-all coherent network between four spin ensembles and demonstrate controllable collective coupling and energy exchange in a scalable setup.

Findings

Successful implementation of on-demand all-to-all interactions

Demonstration of coherent energy exchange in the time domain

Potential for large-scale quantum network applications

Abstract

Achieving all-to-all coherent networks is critical for the advancement of large-scale coherent computing and communication protocols. By exploiting the resonant dipole-dipole interaction between distant spin ensembles coupled to a one-dimensional coplanar waveguide (CPW) terminated by a mirror, we successfully demonstrate an on-demand all-to-all selective coherent network between four spin ensembles. Furthermore, by repositioning the spin ensembles along the CPW, we achieve collective coupling, and demonstrate coherent energy exchange between multiple spin ensembles in the time domain. These results strongly indicate the potential of this device as a medium-scale all-to-all network structure, which is poised to advance the exploration of many-body physics and enhance coherent information processing capabilities.