Related papers: Non-degenerate pumping of superconducting resonator parametric amplifier with evidence of phase-sensitive amplification

Non-degenerate pumping of superconducting resonator parametric amplifier with evidence of phase-sensitive amplification

URL: http://arxiv.org/abs/2505.06155v1
Date: Fri, 09 May 2025 16:05:20 GMT
Title: Non-degenerate pumping of superconducting resonator parametric amplifier with evidence of phase-sensitive amplification
Authors: Songyuan Zhao, Stafford Withington, Christopher Thomas,
Abstract summary: We propose and realise an operation scheme that achieves amplification through the use of non-degenerate pumps.<n>We have experimentally demonstrated the non-degenerate pumping scheme using a half-wave resonator amplifier based on NbN thin-film.<n>We have found the non-degenerate pumping scheme to be more stable compared to the usual degenerate pumping scheme in terms of gain drift against time, by a factor of 4.
Score: 4.170417653730431
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Superconducting resonator parametric amplifiers are potentially important components for a wide variety of fundamental physics experiments and utilitarian applications. We propose and realise an operation scheme that achieves amplification through the use of non-degenerate pumps, which addresses two key challenges in the design of parametric amplifiers: non-continuous gain across the band over which amplification is possible, and pump-tone removal. We have experimentally demonstrated the non-degenerate pumping scheme using a half-wave resonator amplifier based on NbN thin-film, and measured peak gain of 26 dB and 3-dB bandwidth of 0.5 MHz. The two non-degenerate pump tones were positioned ~10 bandwidths above and below the frequency at which peak gain occurs. We have found the non-degenerate pumping scheme to be more stable compared to the usual degenerate pumping scheme in terms of gain drift against time, by a factor of 4. This scheme also retains the usual flexibility of NbN resonator parametric amplifiers in terms of reliable amplification in a ~4 K environment, and is suitable for cross-harmonic amplification. The use of pump at different frequencies allows phase-sensitive amplification when the signal tone is degenerate with the idler tone. A gain of 23 dB and squeezing ratio of 6 dB have been measured.

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