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Optimizing Josephson-Ring-Modulator-based Josephson Parametric Amplifiers via full Hamiltonian control

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Chenxu Liu, Tzu-Chiao Chien, Michael Hatridge, David Pekker

Quantum Physics · Submitted 25 Nov 2019

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We show that by tuning the external and shunt inductors, we should be able to take the best experimentally available JPAs and improve their saturation power by $\sim 15$ dB.

how it is stated · hedged possibility 0.74 read the record →

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arXiv ID1911.11176 (version 3)
Pith ID47SSRTSC, Pith's permanent record of this paper and its review
CitationChenxu Liu, David Pekker, Michael Hatridge, Tzu-Chiao Chien. "Optimizing Josephson-Ring-Modulator-based Josephson Parametric Amplifiers via full Hamiltonian control." arXiv:1911.11176 (2019). https://pith.science/paper/47SSRTSC
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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,701 input tokens.

What the abstract itself states, as probabilities: claims first 0.06 · states limitation 0.46 · human participants 0.02 · controlled comparison 0.16 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.76 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v3. Results and the main claim are underlined; .

Josephson Parametric Amplifiers (JPA) are nonlinear devices that are used for quantum sensing and qubit readout in the microwave regime. While JPAs regularly operate in the quantum limit, their gain saturates for very small (few photons) input power. In a previous work, we showed that the saturation power of JPAs is not limited by pump depletion, but instead by the high-order nonlinearity of Josephson junctions, the nonlinear circuit elements that enable amplification in JPAs. Here, we present a systematic study of the nonlinearities in JPAs, we show which nonlinearities limit the saturation power, and present a strategy for optimizing the circuit parameters for achieving the best possible JPA. For concreteness, we focus on JPAs that are constructed around a Josephson Ring Modulator (JRM). We show that by tuning the external and shunt inductors, we should be able to take the best experimentally available JPAs and improve their saturation power by $\sim 15$ dB. Finally, we argue that our methods and qualitative results are applicable to a broad range of cavity based JPAs.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Josephson Parametric Amplifiers (JPA) are nonlinear devices that are used for quantum sensing and qubit readout in the microwave regime. background 1.00 0.05 0.02 asserted 1.00
s1 While JPAs regularly operate in the quantum limit, their gain saturates for very small (few photons) input power. background 0.89 0.13 0.02 asserted 1.00
s2 In a previous work, we showed that the saturation power of JPAs is not limited by pump depletion, but instead by the high-order nonlinearity of Josephson junctions, the nonlinear circuit elements that enable amplification in JPAs. background 0.79 0.36 0.07 asserted 1.00
s3 Here, we present a systematic study of the nonlinearities in JPAs, we show which nonlinearities limit the saturation power, and present a strategy for optimizing the circuit parameters for achieving the best possible JPA. contribution 1.00 0.92 0.19 asserted 1.00
s4 For concreteness, we focus on JPAs that are constructed around a Josephson Ring Modulator (JRM). method 0.47 0.34 0.03 asserted 0.90
s5 We show that by tuning the external and shunt inductors, we should be able to take the best experimentally available JPAs and improve their saturation power by $\sim 15$ dB. result 0.98 0.84 0.72 hedged possibility 0.74
s6 Finally, we argue that our methods and qualitative results are applicable to a broad range of cavity based JPAs. interpretation 0.97 0.58 0.14 asserted 0.46

What kind of paper the classifier reports this is: method or tool 0.74 · evidence from proof or derivation 0.54.

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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

Josephson Parametric Amplifiers (JPA) are nonlinear devices that are used for quantum sensing and qubit readout in the microwave regime. While JPAs regularly operate in the quantum limit, their gain saturates for very small (few photons) input power. In a previous work, we showed that the saturation power of JPAs is not limited by pump depletion, but instead by the high-order nonlinearity of Josephson junctions, the nonlinear circuit elements that enable amplification in JPAs. Here, we present a systematic study of the nonlinearities in JPAs, we show which nonlinearities limit the saturation power, and present a strategy for optimizing the circuit parameters for achieving the best possible JPA. For concreteness, we focus on JPAs that are constructed around a Josephson Ring Modulator (JRM). We show that by tuning the external and shunt inductors, we should be able to take the best experimentally available JPAs and improve their saturation power by $\sim 15$ dB. Finally, we argue that our methods and qualitative results are applicable to a broad range of cavity based JPAs.

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