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QUBIC: The QU Bolometric Interferometer for Cosmology.
Astroparticle Physics, 34 (9).
Context. One of the major challenges of modern cosmology is the detection of B-mode polarization anisotropies in the Cosmic
Microwave Background. These originate from tensor fluctuations of the metric produced during the inflationary phase. Their detection
would therefore constitute a major step towards understanding the primordial Universe. The expected level of these anisotropies is
however so small that it requires a new generation of instruments with high sensitivity and extremely good control of systematic
Aims. We propose the QUBIC instrument based on the novel concept of bolometric interferometry, bringing together the sensitivity
advantages of bolometric detectors with the systematics eects advantages of interferometry.
Methods. The instrument will directly observe the sky through an array of entry horns whose signals will be combined together
using an optical combiner. The whole set-up is located inside a cryostat. Polarization modulation will be achieved using a rotating
half-wave plate and the images of the interference fringes will be formed on two focal planes (separated by a polarizing grid) tiled
Results.We show that QUBIC can be considered as a synthetic imager, exactly similar to a usual imager but with a synthesized beam
formed by the array of entry horns. Scanning the sky provides an additional modulation of the signal and improve the sky coverage
shape. The usual techniques of map-making and power spectrum estimation can then be applied. We show that the sensitivity of
such an instrument is comparable with that of an imager with the same number of horns. We anticipate a low level of beam-related
systematics thanks to the fact that the synthesized beam is determined by the location of the primary horns. Other systematics should
be under good control thanks to an autocalibration technique, specific to our concept, that will permit the accurate determination of
most of the systematics parameters.
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