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The Q/U Imaging ExperimenT (QUIET) has observed the cosmic microwavebackground (CMB) at 43 and 95GHz. The 43-GHz results have been published inQUIET Collaboration et al. (2011), and here we report the measurement of CMBpolarization power spectra using the 95-GHz data. This data set comprises 5337hours of observations recorded by an array of 84 polarized coherent receiverswith a total array sensitivity of 87 uK sqrt(s). Four low-foreground fieldswere observed, covering a total of ~1000 square degrees with an effectiveangular resolution of 12.8', allowing for constraints on primordialgravitational waves and high-signal-to-noise measurements of the E-modes acrossthree acoustic peaks. The data reduction was performed using two independentanalysis pipelines, one based on a pseudo-Cl (PCL) cross-correlation approach,and the other on a maximum-likelihood (ML) approach. All data selectioncriteria and filters were modified until a predefined set of null tests hadbeen satisfied before inspecting any non-null power spectrum. The resultsderived by the two pipelines are in good agreement. We characterize the EE, EBand BB power spectra between l=25 and 975 and find that the EE spectrum isconsistent with LCDM, while the BB power spectrum is consistent with zero.Based on these measurements, we constrain the tensor-to-scalar ratio tor=1.1+0.9-0.8 (r<2.8 at 95% C.L.) as derived by the ML pipeline, andr=1.2+0.9-0.8 (r<2.7 at 95% C.L.) as derived by the PCL pipeline. In one of thefields, we find a correlation with the dust component of the Planck Sky Model,though the corresponding excess power is small compared to statistical errors.Finally, we derive limits on all known systematic errors, and demonstrate thatthese correspond to a tensor-to-scalar ratio smaller than r=0.01, the lowestlevel yet reported in the literature.

Second Season QUIET Observations: Measurements of the CMB Polarization Power Spectrum at 95 GHz