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Abstract: Measurements of the polarisation of the
cosmic microwave background (CMB) are an important tool to test our
understanding of the Universe. Searches for the faint CMB B-mode
signals offer the prospect of detecting inflationary gravitational
waves on large angular scales and mapping out the large scale
distribution of matter in the Universe through CMB lensing on smaller
angular scales. The Antarctic plateau, in addition to being one of the
few places isolated enough to avoid covid, is an exceptional site for
microwave astronomy, and is the home of the South Pole Telescope. I
will show recent results from the SPT-3G camera on the South Pole
Telescope. I will also say a few words about CMB-S4, a new experiment
being built for first light at the end of the decade.
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