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1 GHz Waveform Synthesis With Josephson Junction Arrays.

IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee·2024
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Jitter Sensitivity Analysis of the Superconducting Josephson Arbitrary Waveform Synthesizer.

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Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers.

Nathan E Flowers-Jacobs1, Anna E Fox1, Paul D Dresselhaus1

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305 USA.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|July 26, 2016
PubMed
Summary
This summary is machine-generated.

The NIST Josephson arbitrary waveform synthesizer (JAWS) now achieves a record 2 V output by combining two 1 V chips. This advancement enhances precision voltage calibrations and measurements requiring quantum accuracy.

Keywords:
Digital-analog conversionJosephson junction arraysMeasurement standardsSignal synthesisSuperconducting integrated circuitsVoltage measurement

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Area of Science:

  • Metrology
  • Quantum electrical metrology
  • Superconducting electronics

Background:

  • The NIST Josephson arbitrary waveform synthesizer (JAWS) is crucial for high-precision voltage generation.
  • Previous limitations in output voltage restricted its application in advanced calibration and measurement.
  • Enhancing the output voltage is key to improving signal-to-noise ratio and accuracy.

Purpose of the Study:

  • To double the root-mean-square (rms) output voltage of the NIST JAWS from 1 V to 2 V.
  • To improve calibrations of ac thermal voltage converters and precision voltage measurements.
  • To develop a more efficient and accurate waveform synthesizer.

Main Methods:

  • Combining two new 1 V Josephson junction (JJ) chips on a cryocooler.
  • Utilizing on-chip Wilkinson dividers and dc blocks for efficient biasing of JJ arrays.
  • Implementing on-chip superconducting interconnects between JJ arrays.

Main Results:

  • Achieved a record 2 V rms output voltage, doubling the previous capability.
  • Reduced the number of required high-speed pulse generator channels by half.
  • Demonstrated a new measurement technique that reduces characterization time by two orders of magnitude.

Conclusions:

  • The enhanced JAWS system provides higher voltage for improved quantum-level accuracy and stability.
  • The modular design and reduced channel count pave the way for future advancements in waveform synthesis.
  • New measurement techniques offer faster and more insightful characterization of JJ systems.