Dispersive Thermometry with a Josephson Junction Coupled to a Resonator

Tutkimustuotos: Lehtiartikkeli

Tutkijat

Organisaatiot

  • Polish Acad Sci, Polish Academy of Sciences, Inst Phys

Kuvaus

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.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli024005
Sivut1-8
Sivumäärä8
JulkaisuPhysical Review Applied
Vuosikerta6
Numero2
TilaJulkaistu - 10 elokuuta 2016
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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