  Droplet impact on a surface is practically relevant to a variety of fields in
nature and industry, while a complete control of its outcomes remains
challenging due to various unmanageable factors. In this work, we propose the
quantum simulation of droplet impact outcomes in the platform of ultracold
atoms. Specifically, we study the quantum-fluctuation-driven dynamics (QFDD) of
two-dimensional Bose-Bose mixtures from an initial Townes soliton towards the
formation of a quantum droplet. By tuning the fluctuation energy of the initial
Townes state through its size and number, the subsequent QFDD can produce
various outcomes including splashing, recoiling, and deposition, similar to
those in droplet impact dynamics. We have utilized the Weber number to identify
the thresholds of splashing and recoiling, and further established a universal
scaling law between the maximum spreading factor and the Weber number in the
recoiling regime. In addition, we show that the residual QFDD in the deposition
regime can be used to probe the collective breathing modes of a quantum
droplet. Our results reveal a mechanism for the droplet impact outcomes, which
can be directly tested in cold-atom experiments and can pave the way for
exploring intriguing droplet dynamics in a clean and fully controlled quantum
setting.
