Engineering quantum cooperativity and long-lived entanglement in quantum hybrid solid-state systems

Dissipation arising from the coupling of a system to its environment is traditionally regarded as a major obstacle for quantum technologies. However, recent advances in light-matter interfaces have demonstrated that correlated dissipation can instead be exploited to realize novel dynamical phases and generate entanglement in many-body quantum systems. In this talk, we show how these insights from quantum optics can be leveraged to open a largely unexplored avenue for studying cooperative quantum phenomena in hybrid solid-state platforms, consisting of an ensemble of solid-state defects coupled to a shared magnetic bath. Building on this, we formulate a scheme to generate long-lived spin squeezing in solid-state qubit ensembles via coupling to a squeezed solid-state bath. Bath-induced quantum correlations are transferred to the qubits, driving them into an entangled steady state independent of initial conditions. Using a realistic model of spin defects coupled to a ferromagnetic bath driven by a surface acoustic wave, we show that steady-state spin squeezing is achievable, offering a robust route to many-body entanglement in solid-state platforms.