QUBIC: using NbSi TESs with a bolometric interferometer to characterize
  the polarisation of the CMB
  QUBIC (Q \& U Bolometric Interferometer for Cosmology) is an international
ground-based experiment dedicated in the measurement of the polarized
fluctuations of the Cosmic Microwave Background (CMB). It is based on
bolometric interferometry, an original detection technique which combine the
immunity to systematic effects of an interferometer with the sensitivity of low
temperature incoherent detectors. QUBIC will be deployed in Argentina, at the
Alto Chorrillos mountain site near San Antonio de los Cobres, in the Salta
province.
  The QUBIC detection chain consists in 2048 NbSi Transition Edge Sensors
(TESs) cooled to 350mK.The voltage-biased TESs are read out with Time Domain
Multiplexing based on Superconducting QUantum Interference Devices (SQUIDs) at
1 K and a novel SiGe Application-Specific Integrated Circuit (ASIC) at 60 K
allowing to reach an unprecedented multiplexing (MUX) factor equal to 128.
  The QUBIC experiment is currently being characterized in the lab with a
reduced number of detectors before upgrading to the full instrument. I will
present the last results of this characterization phase with a focus on the
detectors and readout system.
