  The formation of dark states is an important concept in quantum sciences, but
its compatibility with strong interparticle interactions, for example, in a
quantum degenerate gas is hardly explored. Here, we realize a dark state in one
of the spins of a two-component, resonantly-interacting Fermi gas using a
$\Lambda$ system within the $D_2$ transitions of $^6$Li at high magnetic field.
The dark state is created in a micrometer-sized region within a one-dimensional
channel connecting two superfluid reservoirs. The particle transport between
the reservoirs is used as a probe. We observe that atoms are transported in the
dark state and the superfluid-assisted fast current is preserved. If the dark
state resonant condition is not met, the transport is suppressed by the
spontaneous emission. We also uncover an asymmetry in the transport timescale
across the two-photon resonance, which is absent in the non-interacting regime.
This work raises questions on the interplay of dark states with interparticle
interactions and opens up perspectives for optical manipulation of fermionic
pairing.
