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We measure the cross-power spectrum of the projected mass density as tracedby the convergence of the cosmic microwave background lensing field from theSouth Pole Telescope (SPT) and a sample of Type 1 and 2 (unobscured andobscured) quasars at z~1 selected with the Wide-field Infrared Survey Explorer,over 2500 deg^2. The cross-power spectrum is detected at ~7-sigma, and wemeasure a linear bias b=1.67+/-0.24, consistent with clustering analyses. Usingan independent lensing map, derived from Planck observations, to measure thecross-spectrum, we find excellent agreement with the SPT analysis. The bias ofthe combined sample of Type 1 and 2 quasars determined in this work is similarto that previously determined for Type 1 quasars alone; we conclude that thatobscured and unobscured quasars must trace the matter field in a similar way.This result has implications for our understanding of quasar unification andevolution schemes.

A direct measurement of the linear bias of mid-infrared-selected quasars at z~1 using cosmic microwave background lensing