Quantum gas mixtures offer a wide field of research, ranging from few-body physics of impurities to many-body physics with emergent long-range interactions and ultracold molecular gases. Achieving precision control of mixtures is much harder than for single-component gases, and consequently, the respective techniques are less developed. Here we report on a decisive step forward in this direction by realizing dissipationless and fully differential optical control of the motional degrees of freedom of one of the species without affecting the other. This is achieved with ${}^{166}\mathrm{Er}$ and ${}^6\mathrm{Li}$ in a novel dual-species experiment, where the measurements are performed on each species separately. Our experiments pave the way to a new generation of precision many-body experiments with quantum gas mixtures with unprecedented long lifetimes and low temperatures.

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• Cold atoms & matter waves
• Mixtures of atomic and/or molecular quantum gases
• Optical lattices & traps