We present a measurement of the cosmic microwave background ( CMB ) gravitational lensing potential using data from the first two seasons of observations with SPTpol , the polarization-sensitive receiver currently installed on the South Pole Telescope ( SPT ) .
The observations used in this work cover 100 deg ^ { 2 } of sky with arcminute resolution at 150 GHz .
Using a quadratic estimator , we make maps of the CMB lensing potential from combinations of CMB temperature and polarization maps .
We combine these lensing potential maps to form a minimum-variance ( MV ) map .
The lensing potential is measured with a signal-to-noise ratio of greater than one for angular multipoles between 100 < L < 250 .
This is the highest signal-to-noise mass map made from the CMB to date and will be powerful in cross-correlation with other tracers of large-scale structure .
We calculate the power spectrum of the lensing potential for each estimator , and we report the value of the MV power spectrum between 100 < L < 2000 as our primary result .
We constrain the ratio of the spectrum to a fiducial \Lambda CDM model to be A _ { MV } = 0.92 \pm 0.14 { ( Stat . ) } \pm 0.08 { ( Sys . ) } .
Restricting ourselves to polarized data only , we find A _ { POL } = 0.92 \pm 0.24 { ( Stat . ) } \pm 0.11 { ( Sys . ) } .
This measurement rejects the hypothesis of no lensing at 5.9 \sigma using polarization data alone , and at 14 \sigma using both temperature and polarization data .