Coherent Coupling of Remote Spin Ensembles via a Cavity Bus
Thomas Astner, Stefan Nevlacsil, Noomi Peterschofsky, Andreas Angerer,, Stefan Rotter, Stefan Putz, J\"org Schmiedmayer, Johannes Majer
TL;DR
This paper demonstrates coherent coupling between two remote nitrogen-vacancy spin ensembles mediated by a cavity, revealing collective states and virtual photon interactions, advancing quantum network capabilities.
Contribution
It introduces a method for coherently coupling distant spin ensembles via a cavity bus, including direct and dispersive interactions, which is novel in quantum information processing.
Findings
Detection of bright and dark collective states
Observation of increased coupling strength
Demonstration of virtual photon-mediated coupling
Abstract
We report coherent coupling between two macroscopically separated nitrogen-vacancy electron spin ensembles in a cavity quantum electrodynamics system. The coherent interaction between the distant ensembles is directly detected in the cavity transmission spectrum by observing bright and dark collective multiensemble states and an increase of the coupling strength to the cavity mode. Additionally, in the dispersive limit we show transverse ensemble-ensemble coupling via virtual photons.
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