Atom-like quantum defects in solids have seen exceptional progress in recent decades and now set the state of the art in several key quantum technologies, ranging from quantum memories in quantum networks to quantum sensors. However, it is clear that we have only scratched the surface of what would become possible with better methods to: (i) model and predict the properties of quantum defects quantitatively; (ii) image and produce quantum defects with nanoscale precision; (iii) coherently control mesoscopic quantum systems; and (iv) translate to practical applications.

Approaches include the development of new types of point-like quantum defects with application-specific properties. For example, entanglement-enhanced sensing techniques using small ensembles of coupled quantum emitters could improve magnetometry sensitivity by orders of magnitude. Molecular quantum systems with sufficient coherence could open new possibilities in applications and scaling. And spectrally stable, homogeneous emitter arrays could speed up entanglement rates in quantum networks by orders of magnitude and enable error-corrected quantum registers.

This workshop will bring together experimental, computational, and theoretical scientists and engineers to identify the key challenges and opportunities in mesoscopic quantum emitter systems. Specific topics include: (i) Predictive electronic structure simulations of atom-like point defects in solids and molecular quantum emitters, using classical and quantum computing resources; (ii) Fabrication and characterization of single and small-ensemble quantum defect systems; (iii) Photonic and electronic structures to improve quantum control; and (iv) Emerging quantum technology applications.