A Josephson traveling-wave parametric amplifier with a second-harmonic current-phase relation reaches about 13 dB gain at an optimal harmonic weight g = -0.6, without dispersion engineering.
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Effect of 2$^\text{nd}$ harmonic current--phase relation on a behavior of a Josephson Traveling Wave Parametric Amplifier
A Josephson traveling-wave parametric amplifier with a second-harmonic current-phase relation reaches about 13 dB gain at an optimal harmonic weight g = -0.6, without dispersion engineering.