Josephson junction microwave amplifier in self-organized noise compression mode

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2012

Department

Department of Applied Physics

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Language

en

Pages

5

Series

Scientific Reports, Volume 2, pp. 1-5

Abstract

The fundamental noise limit of a phase-preserving amplifier at frequency is the standard quantum limit . In the microwave range, the best candidates have been amplifiers based on superconducting quantum interference devices (reaching the noise temperature at 700 MHz), and non-degenerate parametric amplifiers (reaching noise levels close to the quantum limit at 8 GHz). We introduce a new type of an amplifier based on the negative resistance of a selectively damped Josephson junction. Noise performance of our amplifier is limited by mixing of quantum noise from Josephson oscillation regime down to the signal frequency. Measurements yield nearly quantum-limited operation, at 2.8 GHz, owing to self-organization of the working point. Simulations describe the characteristics of our device well and indicate potential for wide bandwidth operation.

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Keywords

amplification, frequency, parametric-amplifier, quantum limit, tunnel-junctions

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DOI

10.1038/srep00276

Citation

Lähteenmäki, P, Vesterinen, V, Hassel, J, Seppä, H & Hakonen, P 2012, 'Josephson junction microwave amplifier in self-organized noise compression mode', Scientific Reports, vol. 2, 276, pp. 1-5. https://doi.org/10.1038/srep00276

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https://urn.fi/URN:NBN:fi:aalto-202510087706

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[article-cris] Perustieteiden korkeakoulu / SCI