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We explore the capability of measuring lensing signals in $LiteBIRD$ full-skypolarization maps. With a $30$ arcmin beam width and an impressively lowpolarization noise of $2.16\,\mu$K-arcmin, $LiteBIRD$ will be able to measurethe full-sky polarization of the cosmic microwave background (CMB) veryprecisely. This unique sensitivity also enables the reconstruction of a nearlyfull-sky lensing map using only polarization data, even considering its limitedcapability to capture small-scale CMB anisotropies. In this paper, weinvestigate the ability to construct a full-sky lensing measurement in thepresence of Galactic foregrounds, finding that several possible biases fromGalactic foregrounds should be negligible after component separation byharmonic-space internal linear combination. We find that the signal-to-noiseratio of the lensing is approximately $40$ using only polarization datameasured over $90\%$ of the sky. This achievement is comparable to $Planck$'srecent lensing measurement with both temperature and polarization andrepresents a four-fold improvement over $Planck$'s polarization-only lensingmeasurement. The $LiteBIRD$ lensing map will complement the $Planck$ lensingmap and provide several opportunities for cross-correlation science, especiallyin the northern hemisphere.

LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB