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A gate-tunable graphene Josephson parametric amplifier.

Guilliam Butseraen1, Arpit Ranadive1, Nicolas Aparicio1

  • 1Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France.

Nature Nanotechnology
|October 25, 2022
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Summary
This summary is machine-generated.

Researchers developed a tunable parametric amplifier using a graphene Josephson junction. This advancement in superconducting quantum circuits offers low noise and wide frequency tuning for quantum technologies.

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Area of Science:

  • Quantum optics
  • Superconducting quantum circuits
  • Quantum information science

Background:

  • Superconducting quantum circuits are crucial for quantum optics and low-noise readout of quantum systems.
  • Parametric amplifiers, often using Josephson junctions, are key components but lack electrical tunability.
  • Semiconductor weak links offer electrical tunability but haven't been integrated into parametric amplifiers.

Purpose of the Study:

  • To demonstrate a parametric amplifier utilizing a graphene Josephson junction.
  • To investigate the electrical tunability and noise performance of such a device.
  • To expand the toolkit for electrically tunable superconducting quantum circuits.

Main Methods:

  • Fabrication of a parametric amplifier based on a graphene Josephson junction.
  • Characterization of the amplifier's working frequency tunability via gate voltage.
  • Measurement of gain and noise performance, comparing it to the standard quantum limit.

Main Results:

  • Demonstrated a parametric amplifier with a graphene Josephson junction.
  • Achieved wide tunability of the working frequency with gate voltage.
  • Reported gain exceeding 20 dB and noise performance near the standard quantum limit.

Conclusions:

  • The developed graphene Josephson junction parametric amplifier offers electrical tunability and excellent performance.
  • This work expands the capabilities of superconducting quantum circuits for quantum technologies.
  • Paves the way for advancements in quantum computing, sensing, and fundamental science.