Dispersive Thermometry with a Josephson Junction Coupled to a Resonator

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2016-08-10
Major/Subject
Mcode
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Language
en
Pages
8
1-8
Series
PHYSICAL REVIEW APPLIED, Volume 6, issue 2
Abstract
We embed a small Josephson junction in a microwave resonator that allows simultaneous dc biasing and dispersive readout. Thermal fluctuations drive the junction into phase diffusion and induce a temperature-dependent shift in the resonance frequency. By sensing the thermal noise of a remote resistor in this manner, we demonstrate primary thermometry in the range of 300 mK to below 100 mK, and high-bandwidth (7.5 MHz) operation with a noise-equivalent temperature of better than 10 mu K/root Hz. At a finite bias voltage close to a Fiske resonance, amplification of the microwave probe signal is observed. We develop an accurate theoretical model of our device based on the theory of dynamical Coulomb blockade.
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Keywords
TUNNEL-JUNCTION, QUANTUM, REFRIGERATION, DYNAMICS, PAIR
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Citation
Saira , O -P , Zgirski , M , Viisanen , K L , Golubev , D S & Pekola , J P 2016 , ' Dispersive Thermometry with a Josephson Junction Coupled to a Resonator ' , Physical Review Applied , vol. 6 , no. 2 , 024005 , pp. 1-8 . https://doi.org/10.1103/PhysRevApplied.6.024005