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Related Experiment Video

Updated: Jan 19, 2026

Fabrication and Characterization of Superconducting Resonators
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Non-Gaussian noise spectroscopy with a superconducting qubit sensor.

Youngkyu Sung1,2, Félix Beaudoin3,4, Leigh M Norris3

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Nature Communications
|September 19, 2019
PubMed
Summary

This study introduces a new method to characterize non-Gaussian noise in quantum systems. The technique uses a superconducting qubit to reconstruct higher-order noise spectra, advancing quantum control and decoherence modeling.

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Area of Science:

  • Quantum Information Science
  • Quantum Control and Sensing

Background:

  • Accurate noise characterization is crucial for quantum science, impacting decoherence modeling and quantum control.
  • The common assumption of Gaussian noise statistics often fails, particularly with strong qubit-environment coupling or non-linear responses.

Purpose of the Study:

  • To develop and experimentally validate a tool for characterizing non-Gaussian noise.
  • To scrutinize the Gaussian noise assumption and identify non-Gaussian signatures in quantum systems.

Main Methods:

  • Experimental validation of a quantum control protocol.
  • Utilizing a superconducting qubit as a sensor.
  • Reconstructing the higher-order spectrum of engineered non-Gaussian dephasing noise.

Main Results:

  • Successful experimental demonstration of non-Gaussian noise spectroscopy.
  • Reconstruction of both the noise spectrum and leading higher-order spectra.
  • Validation of a quantum control protocol for noise characterization.

Conclusions:

  • This work represents a significant advancement in quantum noise spectroscopy.
  • The developed protocol is a key step towards a complete spectral estimation toolbox for quantum devices.
  • Enables more accurate modeling of decoherence and optimized quantum control strategies.