Dispersive Thermometry with a Josephson Junction Coupled to a Resonator

O. -P. Saira*, M. Zgirski, K. L. Viisanen, D. S. Golubev, J. P. Pekola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number024005
Pages (from-to)1-8
Number of pages8
JournalPhysical Review Applied
Volume6
Issue number2
DOIs
Publication statusPublished - 10 Aug 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • TUNNEL-JUNCTION
  • QUANTUM
  • REFRIGERATION
  • DYNAMICS
  • PAIR

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