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Primordial black holes possibly formed in the early universe could provide asignificant fraction of the dark matter and would be unique probes ofinflation. A smoking gun for their discovery would be the detection of asubsolar mass compact object. We argue that extreme mass-ratio inspirals willbe ideal to search for subsolar-mass black holes not only with LISA but alsowith third-generation ground-based detectors such as Cosmic Explorer and theEinstein Telescope. These sources can provide unparalleled measurements of themass of the secondary object at subpercent level for primordial black holes aslight as ${\cal O}(0.01)M_\odot$ up to luminosity distances around hundredmegaparsec and few gigaparsec for LISA and Einstein Telescope, respectively, ina complementary frequency range. This would allow claiming, with very highstatistical confidence, the detection of a subsolar-mass black hole, whichwould also provide a novel (and currently undetectable) family of sources forthird-generation detectors.

Detecting Subsolar-Mass Primordial Black Holes in Extreme Mass-Ratio Inspirals with LISA and Einstein Telescope