Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4704151
Keywords
aluminium; microwaves; quasiparticles; superconducting resonators
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Funding
- NWO [639.041.023]
- JSPS
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We have measured the number of quasiparticles and their lifetime in aluminium superconducting microwave resonators. The number of excess quasiparticles below 160mK decreases from 72 to 17 mu m(-3) with a 6 dB decrease of the microwave power. The quasiparticle lifetime increases accordingly from 1.4 to 3.5 ms. These properties of the superconductor were measured through the spectrum of correlated fluctuations in the quasiparticle system and condensate of the superconductor, which show up in the resonator amplitude and phase, respectively. Because uncorrelated noise sources vanish, fluctuations in the superconductor can be studied with a sensitivity close to the vacuum noise. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4704151]
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