Abstract
We present measurements of the quasiparticle lifetime using optical pulses in the temperature range of 50 mK–1 K as well as measurements of the noise spectrum under continuous illumination in planar tantalum resonators. When decreasing the temperature the quasiparticle lifetime increases until it enters a saturation regime, reaching lifetime values of up to 35 μs at around 650 mK which decrease to a value of around 25 μs below a temperature of 350 mK. The noise spectrum follows a single pole Lorentzian spectrum, indicating that the quasiparticle lifetime is the only relevant timescale.
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