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Cosmic microwave background (CMB) experiments that constrain thetensor-to-scalar ratio $r$ are now approaching the sensitivity at whichdelensing---removing the $B$ modes induced by the gravitational lensing oflarge-scale structure---is necessary. We consider the improvement in delensingthat maps of large-scale structure from tomographic line intensity mapping (IM)experiments targeting $2 < z < 10$ could provide. Compared to a nominalbaseline of cosmic infrared background and internal delensing at CMB-S4sensitivity, we find that the addition of high-redshift IM data could improvedelensing performance by ~11%. Achieving the requisite sensitivity in the IMdata is feasible with next-generation experiments that are now being planned.However, these results are contingent on the ability to measure low-$k$ modesalong the line of sight. Without these modes, IM datasets are unable to tocorrelate with the lensing kernel and do not aid in delensing.

Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping