The four-port PIXIE spectrometer cancels common-mode beam ellipticity before detection, leaving temperature-to-polarization leakage suppressed by roughly 10^5 to 10^6 at the spin frequency where true CMB polarization appears.
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Systematic error cancellation for a four-port interferometric polarimeter
The four-port PIXIE spectrometer cancels common-mode beam ellipticity before detection, leaving temperature-to-polarization leakage suppressed by roughly 10^5 to 10^6 at the spin frequency where true CMB polarization appears.