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Bulletin of the American Physical Society

Characterization of flux-driven Josephson parametric amplifiers

A. Baust, E. P. Menzel, Thomas M. Niemczyk, Eric A. Hoffmann, M. Haeberlein, Frank Deppe, Achim Marx, Rudolf Groß, E. Solano, K. Inomata, Takashi Yamamoto, Yasunobu Nakamura

Published Mar 22, 2011• 1 citation
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The axion is a hypothetical particle, a promising candidate for dark matter, and a solution to the strong CP problem.Axion haloscope search experiments deal with a signal power comparable to noise uncertainty at millikelvin temperature.We use a flux-driven Josephson parametric amplifier (JPA) with the aim of approaching a noise level near the theoretically allowed limit of half quanta.In our measurements to characterize the JPA we have found the added noise to the system with a JPA as the first-stage amplifier to be lower than 110 mK at the frequencies from 0.938 GHz to 0.963 GHz.

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The axion is a hypothetical particle, a promising candidate for dark matter, and a solution to the strong CP problem.Axion haloscope search experiments deal with a signal power comparable to noise uncertainty at millikelvin temperature.We use a flux-driven Josephson parametric amplifier (JPA) with the aim of approaching a noise level near the theoretically allowed limit of half quanta.In our measurements to characterize the JPA we have found the added noise to the system with a JPA as the first-stage amplifier to be lower than 110 mK at the frequencies from 0.938 GHz to 0.963 GHz.