A solid-state platform for cooperative quantum phenomena

The dissipation stemming from the coupling of a system with its environment is not always detrimental to quantum phenomena; in fact, it can be harnessed as a valuable resource. For example, correlated dissipation in light-matter interfaces can be exploited to engineer innovative dynamic states of matter and induce entanglement within many-body quantum systems. In this work, we focus on exploration of cooperative quantum phenomena induced by this form of dissipation in quantum hybrid solid-state platforms. We develop a comprehensive formalism for the quantum many-body dynamics of an ensemble of solid-state spin defects interacting via the magnetic field fluctuations of a common solid-state reservoir. Our general framework captures effective qubit-qubit interactions mediated by correlated dissipation, naturally extending the established theory of quantum sensing from its traditional focus on detecting local magnetic noise via individual solid-state spin defects to now encompass the sensing of nonlocal temporal and spatial correlations. To assess the practical relevance of these dissipative correlations, we apply our model to a qubit array interacting via the spin fluctuations of a ferromagnetic reservoir, representing a realistic experimental setup. Our results reveal the emergence of cooperative phenomena, such as superradiance and subradiance, within the appropriate parameter range. Furthermore, our findings demonstrate the remarkable robustness of these cooperative phenomena against spatial disorder and thermal fluctuations. Our work lays the cornerstone for the convergence of spintronics and quantum optics, thus paving the way for a shared research trajectory in the near future.