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Low temperature Kinetic Inductance Detectors (KIDs) are attractive candidatesfor producing quantumsensitive, arrayable sensors for astrophysical and otherprecision measurement applications. The readout uses a low frequency probesignal with quanta of energy well-below the threshold for pair-breaking in thesuperconductor. We have calculated the detailed non-equilibrium quasiparticleand phonon energy spectra generated by the probe signal of the KID whenoperating well-below its superconducting transition temperature Tc within theframework of the coupled kinetic equations described by Chang and Scalapino.[1]At the lowest bath temperature studied Tb/Tc = 0.1 the quasiparticledistributions can be driven far from equilibrium. In addition to the lowfrequency probe signal we have incorporated a high frequency (~ 1 THz) sourcesignal well-above the pair-breaking threshold of the superconductor.Calculations of source signal detection efficiency are discussed

Non-Equilibrium Superconductivity in Kinetic Inductance Detectors for THz Photon Sensing