In the Rydberg quantum annealer illustrated in Fig. 1, qubits are encoded in two long-lived hyperfine ground states , of 87Rb and , of 133Cs, representing physical and ancilla spins, respectively. These states are trapped in a deep optical or magnetic square lattice with unity filling and frozen motion2223. Consecutive loading schemes of rubidium and caesium have been successfully demonstrated21, which could be combined with the recent remarkable progress in trapping atoms in almost arbitrary 2D geometries using optical tweezers2223. Alternatively, it was suggested20 that rubidium and caesium atoms are trapped in the same optical lattice created by counter-propagating laser beams with wavelength λL≈820 nm. This particular wavelength is blue detuned for Cs atoms, which will be trapped at the intensity minima, but red detuned for Rb atoms, which will be trapped at the intensity maxima. Thus the atoms are trapped in an alternating pattern, as illustrated in Fig. 1.