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Characterization of a Josephson Junction Comb Generator



Akim Babenko, Alirio De Jesus Soares Boaventura, Nathan Flowers-Jacobs, Justus Brevik, Anna Fox, Dylan Williams, Zoya Popovic, Paul Dresselhaus, Samuel P. Benz


We present a new type of microwave frequency combs with a potentially calculable pulse shape. The device is an array of 1500 Josephson junctions (JJs) connected in series along a transmission line. The pulse generation is based on the nonlinearity of the JJs. A large-signal network analyzer and a cryogenic probe station are used to characterize the pulses in the frequency domain up to 50 GHz. We compare the measured data to simulations that use the resistively and capacitively shunted JJ model. The amplitude stability of the demonstrated comb generator is better than 0.5 dB per 0.1 dB input drive variation within the operating range. Finally, we observe qualitative agreement between the measured and simulated power spectrum dependence on the input power, and discuss possible improvements to the system model.
Conference Dates
August 4-6, 2020
Conference Location
Los Angeles, CA, US
Conference Title
International Microwave Symposium


microwave frequency combs, calculable pulse shape, 1500 Josephson junctions, nonlinearity, large-signal network analyzer, cryogenic probe station, amplitude stability


Babenko, A. , Soares Boaventura, A. , Flowers-Jacobs, N. , Brevik, J. , Fox, A. , Williams, D. , Popovic, Z. , Dresselhaus, P. and Benz, S. (2020), Characterization of a Josephson Junction Comb Generator, International Microwave Symposium, Los Angeles, CA, US, [online],, (Accessed May 29, 2024)


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Created October 13, 2020, Updated March 31, 2022