An exchange-assisted entangling gate between 87Rb and 171Yb Rydberg atoms

Neutral-atom tweezer arrays support scalable quantum information processing. Dual-species ${}^{87}\mathrm{R}\mathrm{b}$–${}^{171}\mathrm{Y}\mathrm{b}$ arrays combine long-lived ytterbium nuclear-spin data qubits with fast, species-selective rubidium ancilla control and readout. However, realizing interspecies gates without inducing destructive Stark mixing in divalent atoms remains an outstanding problem. Here, we identify an optically accessible $S+S\leftrightarrow P+P$ Förster resonance at zero electric field, providing strong dipole-dipole exchange at array pitch. Using a shaped optical pulse under finite control response, we demonstrate a $0.36\mu \mathrm{s}$ exchange-assisted controlled-$Z$ gate with an intrinsic fidelity of $99.91\mathrm{\%}$, remaining above $99.85\mathrm{\%}$ under bounded perturbations. We also identify an auxiliary repulsive van der Waals channel, providing a comprehensive toolbox for hybrid quantum processors.