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We present measurements of polarization lensing using the 150 GHz maps whichinclude all data taken by the BICEP2 & Keck Array CMB polarization experimentsup to and including the 2014 observing season (BK14). Despite their modestangular resolution ($\sim 0.5^\circ$), the excellent sensitivity ($\sim3\mu$K-arcmin) of these maps makes it possible to directly reconstruct thelensing potential using only information at larger angular scales ($\ell\leq700$). From the auto-spectrum of the reconstructed potential we measure anamplitude of the spectrum to be $A^{\phi\phi}_{\rm L}=1.15\pm 0.36$ (Planck$\Lambda$CDM prediction corresponds to $A^{\phi\phi}_{\rm L}=1$), and rejectthe no-lensing hypothesis at 5.8$\sigma$, which is the highest significanceachieved to date using an EB lensing estimator. Taking the cross-spectrum ofthe reconstructed potential with the Planck 2015 lensing map yields$A^{\phi\phi}_{\rm L}=1.13\pm 0.20$. These direct measurements of$A^{\phi\phi}_{\rm L}$ are consistent with the $\Lambda$CDM cosmology, and withthat derived from the previously reported BK14 B-mode auto-spectrum ($A^{\rmBB}_{\rm L}=1.20\pm 0.17$). We perform a series of null tests and consistencychecks to show that these results are robust against systematics and areinsensitive to analysis choices. These results unambiguously demonstrate thatthe B-modes previously reported by BICEP / Keck at intermediate angular scales($150\lesssim\ell\lesssim 350$) are dominated by gravitational lensing. Thegood agreement between the lensing amplitudes obtained from the lensingreconstruction and B-mode spectrum starts to place constraints on anyalternative cosmological sources of B-modes at these angular scales.

BICEP2 / Keck Array VIII: Measurement of gravitational lensing from large-scale B-mode polarization