CMB lensing from Planck PR4 maps

We reconstruct the Cosmic Microwave Background (CMB) lensing potential on latest Planck CMB PR4 (NPIPE) maps, which include slightly more data than 2018 PR3 release, and implement quadratic estimators using optimal filtering. increase reconstruction signal to noise by almost $20\%$, constraining amplitude of CMB-marginalized power spectrum in units best-fit $1.004 \pm 0.024$ ($68\%$ limits), is tightest constraint date. For a base $\Lambda$CDM cosmology we find $\sigma_8 \Omega_m^{0.25} = 0.599\pm 0.016$ from alone combination with weak priors element abundance observations. Combination baryon acoustic oscillation gives tight $68\%$ constraints individual parameters 0.814\pm 0.016$, $H_0 68.1^{+1.0}_{-1.1}$km s$^{-1}$ Mpc$^{-1}$, $\Omega_m 0.313^{+0.014}_{-0.016}$. polarized maps now constrain $7\%$.