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Terahertz spectrometers with a wide instantaneous frequency coverage forpassive remote sensing are enormously attractive for many terahertzapplications, such as astronomy, atmospheric science and security. Here wedemonstrate a wide-band terahertz spectrometer based on a singlesuperconducting chip. The chip consists of an antenna coupled to a transmissionline filterbank, with a microwave kinetic inductance detector behind eachfilter. Using frequency division multiplexing, all detectors are read-outsimultaneously creating a wide-band spectrometer with an instantaneousbandwidth of 45 GHz centered around 350 GHz. The spectrometer has a spectralresolution of $F/\Delta F=380$ and reaches photon-noise limited sensitivity. Wediscuss the chip design and fabrication, as well as the system integration andtesting. We confirm full system operation by the detection of an emission linespectrum of methanol gas. The proposed concept allows for spectroscopicradiation detection over large bandwidths and resolutions up to $F/\DeltaF\sim1000$, all using a chip area of a few $\mathrm{cm^2}$. This will allow theconstruction of medium resolution imaging spectrometers with unprecedentedspeed and sensitivity.

Wideband on-chip terahertz spectrometer based on a superconducting filterbank