| Summary: | International audience QUBIC (Q and U Bolometric Interferometer for Cosmology) is a Fizeau interferometer sensi- tive to linear polarisation, to be deployed at the Antarctic Station of Dome C. This experiment in its nal conguration will be operated at 97, 150 and 220 GHz, and is intended to target CMB primordial B-modes in a multipole window 20 ` 150, to achieve a nal sensitivity of r=0.01 (90%CL) after 1 year of operation. Here we review in particular its working princi- ples and we show how QUBIC interferometric conguration can be considered equivalent to a pupil-plane ltered imaging system. In this context, we show how our instrument can be self-calibrated. Finally, we conclude by showing an overall view on the 150 GHz unit, which will play the role of a demonstrator for the subsequent modules, and review the technological choices we did for each subsystem
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