Research Talks

Optimizing Josephson Parametric Amplifiers for Fast, High-Fidelity Qubit Readout

Zlatko K. Minev, Rajamani Vijay, Irfan Siddiqi

Research talk · 2011 · APS March Meeting (poster) · 1 pages

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Describes a solver for the driven, damped, nonlinear Josephson oscillator, built with fourth-order Runge-Kutta and Gaussian noise, used to map gain against pump and signal amplitude. Noise-free runs agree with analytical theory, while runs with noise show gain suppression and an asymmetric SNR degradation around maximum gain. Planned work covers bandwidth versus Q, stray parameters and multi-junction amplifiers.

  • JPA as a pumped nonlinear resonator for high-fidelity qubit readout
  • Runge-Kutta solver with thermal noise; C++ core run in parallel from LabVIEW
  • Gain curves, 1 dB compression, and band tuning with critical current
  • SNR degradation by the ideal factor of 2, and reaching the quantum limit when k_B T << ħω

Summary and key points drafted by a language model from the slides, not yet reviewed by me. The slides are the source.

Cite

@misc{minev2011optimizingjosephson,
  author = {Zlatko K. Minev and Rajamani Vijay and Irfan Siddiqi},
  title = {{Optimizing Josephson Parametric Amplifiers for Fast, High-Fidelity Qubit Readout}},
  howpublished = {Talk, APS March Meeting (poster)},
  year = {2011},
  url = {https://zlatko-minev.github.io/zlatko-minev-quantum-repository/items/2011-optimizing-josephson-parametric-amplifiers-for-fast/},
  note = {Slides}
}

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