JPA with Improved bandwidth and saturation of power, Part II: Experiment

ORAL

Abstract

Josephson parametric amplifiers (JPAs) have become crucial components of superconducting qubit measurements to overcome the low signal to noise ratio in the dispersive readout scheme and enabling single-shot readout. To enable multiplexing of qubit readout along a single line, we have designed broadband JPAs with higher saturation power. We develop a measurement approach to optimize JPA performance using a pulsed measurement scheme to carefully select operating parameters such as DC bias, pump frequency and pump power. The pulsed bring-up is enabled by software defined radios for scalable characterization. We describe the characterization and performance of these JPAs and discuss implications on qubit measurement fidelity and multiplexing.

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Presenters

  • Saniya Deshpande

    • Rigetti Quantum Computing

Authors

  • Saniya Deshpande

    • Rigetti Quantum Computing

  • Michael Selvanayagam

    • Rigetti Quantum Computing

  • Dennis Feng

    • Rigetti Quantum Computing

  • Prasahnt Sivarajah

    • Rigetti Quantum Computing

  • Alexa Staley

    • Rigetti Quantum Computing

  • Ting-Wai To

    • Rigetti Quantum Computing

  • Tom Manning

    • Rigetti Quantum Computing

  • Damon Russell

    • Rigetti Quantum Computing

  • Shane Caldwell

    • Rigetti Quantum Computing

  • Alexander Papageorge

    • Rigetti Quantum Computing

  • Mehrnoosh Vahidpour

    • Rigetti Quantum Computing

  • Chad Rigetti

    • Rigetti Quantum Computing