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CMB B modes have not yet been detected. The Q/U Imaging ExperimenT (QUIET) recently reported a measurement of the CMB polarization at 43-GHz (Q band). This is one of the best limits to date on inflationary B modes. Moreover the unique QUIET design leads to the lowest levels of systematic contamination in the inflationary signal reported by any CMB polarization experiment.
I will describe the QUIET instrument, how it mitigates systematic contamination, and results from the first season of Q-band observation. I will also report the status of analysis of the second-season 95-GHz (W-band) data.