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QUBIC: The Q & U Bolometric Interferometer for Cosmology

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The Q & U Bolometric Interferometer for Cosmology, QUBIC, is an innovative experiment designed to measure the polarization of the cosmic microwave background and in particular the signature left therein by the inflationary expansion of the Universe. The expected signal is extremely faint; thus, extreme sensitivity and systematic control are necessary in order to attempt this measurement. QUBIC addresses these requirements using an innovative approach combining the sensitivity of transition-edge sensor cryogenic bolometers, with the deep control of systematics characteristic of interferometers. This makes QUBIC unique with respect to others' classical imagers experiments devoted to the CMB polarization. In this contribution, we report a description of the QUBIC instrument including recent achievements and the demonstration of the bolometric interferometry performed in laboratory. QUBIC will be deployed at the observation site in Alto Chorrillos, in Argentina, at the end of 2019.

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QUBIC is funded by the following agencies. France: ANR (Agence Nationale de la Recherche) 2012 and 2014, DIM-ACAV (Domaine d’Interet Majeur-Astronomie et Conditions d’Apparition de la Vie), CNRS/IN2P3 (Centre national de la recherche scientifique/Institut national de physique nucleáire et de physique des particules), CNRS/INSU (Centre national de la recherche scientifique/Institut national de sciences de l’univers). Italy: CNR/PNRA (Consiglio Nazionale delle Ricerche/Programma Nazionale Ricerche in Antartide) until 2016, INFN (Istituto Nazionale di Fisica Nucleare) since 2017. Argentina: Secretaría de Gobierno de Ciencia, Tecnología e Innovación Productiva, Comisión Nacional de Energía Atómica, Consejo Nacional de Investigaciones Científicas y Técnicas.

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Correspondence to E. S. Battistelli.

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Battistelli, E.S., Ade, P., Alberro, J.G. et al. QUBIC: The Q & U Bolometric Interferometer for Cosmology. J Low Temp Phys 199, 482–490 (2020).

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