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Non-linearity in the system of quasiparticles of a superconducting resonator

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arxiv 2102.09431 v1 pith:6EPWYG7E submitted 2021-02-18 cond-mat.supr-con physics.ins-det

classification cond-mat.supr-conphysics.ins-det
keywords quasiparticlesnon-linearityobservedreadoutresonatorsuperconductingsystemable
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We observed a strong non-linearity in the system of quasiparticles of a superconducting aluminum resonator, due to the Cooper-pair breaking from the absorbed readout power. We observed both negative and positive feedback effects, controlled by the detuning of the readout frequency, which are able to alter the relaxation time of quasiparticles by a factor greater than 10. We estimate that the (70+/-5) % of the total non-linearity of the device is due to quasiparticles.

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