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QUBIC (Q \& U Bolometric Interferometer for Cosmology) is an internationalground-based experiment dedicated in the measurement of the polarizedfluctuations of the Cosmic Microwave Background (CMB). It is based onbolometric interferometry, an original detection technique which combine theimmunity to systematic effects of an interferometer with the sensitivity of lowtemperature incoherent detectors. QUBIC will be deployed in Argentina, at theAlto Chorrillos mountain site near San Antonio de los Cobres, in the Saltaprovince.  The QUBIC detection chain consists in 2048 NbSi Transition Edge Sensors(TESs) cooled to 350mK.The voltage-biased TESs are read out with Time DomainMultiplexing based on Superconducting QUantum Interference Devices (SQUIDs) at1 K and a novel SiGe Application-Specific Integrated Circuit (ASIC) at 60 Kallowing to reach an unprecedented multiplexing (MUX) factor equal to 128.  The QUBIC experiment is currently being characterized in the lab with areduced number of detectors before upgrading to the full instrument. I willpresent the last results of this characterization phase with a focus on thedetectors and readout system.

QUBIC: using NbSi TESs with a bolometric interferometer to characterize the polarisation of the CMB