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Dispersive Thermometry with a Josephson Junction Coupled to a Resonator
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en
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8
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Physical Review Applied, Volume 6, issue 2, pp. 1-8
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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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