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The complex collisional properties of atoms fundamentally limitinvestigations into a range of processes in many-atom ensembles. In contrast,the bottom-up assembly of few- and many-body systems from individual atomsoffers a controlled approach to isolating and studying such collisionalprocesses. Here, we use optical tweezers to individually assemble pairs oftrapped $^{85}$Rb atoms, and study the spin dynamics of the two-body system ina thermal state. The spin-2 atoms show strong pair correlation between magneticsublevels on timescales exceeding one second, with measured relative numberfluctuations $11.9\pm0.3$ dB below quantum shot noise, limited only bydetection efficiency. Spin populations display relaxation dynamics consistentwith simulations and theoretical predictions for $^{85}$Rb spin interactions,and contrary to the coherent spin waves witnessed in finite-temperaturemany-body experiments and zero-temperature two-body experiments. Ourexperimental approach offers a versatile platform for studying two-body quantumdynamics and may provide a route to thermally-robust entanglement generation.

Thermally-robust spin correlations between two 85Rb atoms in an optical microtrap