  Deuteron production in high-energy collisions is sensitive to the space-time
evolution of the collision system, and is typically described by a coalescence
mechanism. For the first time, we present results on jet-associated deuteron
production in \pp\ collisions at $\sqrt{s}=13$ TeV, providing an opportunity to
test the established picture for deuteron production in events with a hard
scattering. Using a trigger particle with high transverse-momentum ($p_{\rm
T}>5$ GeV/$c$) as a proxy for the presence of a jet at midrapidity, we observe
a measurable population of deuterons being produced around the jet proxy. The
associated deuteron yield measured in a narrow angular range around the trigger
particle differs by 2.4-4.8 standard deviations from the uncorrelated
background. The data are described by PYTHIA model calculations featuring
baryon coalescence.
