Dispersive thermometry with a Josephson junction coupled to a resonator

We have embedded 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...

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Bibliographic Details
Published in:arXiv.org 2016-07
Main Authors: O -P Saira, Zgirski, M, Viisanen, K L, Golubev, D S, Pekola, J P
Format: Article
Language:English
Subjects:
Dispersion
Josephson junctions
Microwave probes
Quantum theory
Remote sensing
Resonators
Temperature dependence
Thermal noise
Variations
Online Access:Get full text
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Summary:We have embedded 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 from 300 mK to below 100 mK, and high-bandwidth (7.5 MHz) operation with a noise-equivalent temperature of better than 10 \(\mathrm{\mu K/\sqrt{Hz}}\). 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1604.05089