Frequency-Resolved Purcell Effect for the Dissipative Generation of Steady-State Entanglement

Frequency-Resolved Purcell Effect for the Dissipative Generation of Steady-State Entanglement - Featured

Scientists from IFIMAC-UAM and IFF-CSIC, Alejandro Vivas-Viaña, Diego Martín-Cano, and Carlos Sánchez Muñoz, have reported a driven-dissipative mechanism to generate stationary entangled W states among strongly interacting quantum emitters placed within a cavity. Driving the ensemble into the highest energy state—whether coherently or incoherently—enables a subsequent cavity-enhanced decay into an entangled steady state consisting of a single deexcitation shared coherently among all emitters, i.e., a W state, well known for its robustness against qubit loss. The nonharmonic energy structure of the interacting ensemble allows this transition to be resonantly selected by the cavity, while quenching subsequent off-resonant decays. Evidence of this purely dissipative mechanism should be observable in state-of-the-art cavity QED systems in the solid state, enabling new prospects for the scalable stabilization of quantum states in dissipative quantum platforms. [Full article]