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Qubit Noise Spectroscopy for Non-Gaussian Dephasing Environments.

Leigh M Norris1, Gerardo A Paz-Silva2, Lorenza Viola1

  • 1Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, New Hampshire 03755, USA.

Physical Review Letters
|April 30, 2016
PubMed
Summary
This summary is machine-generated.

We developed new quantum control methods to analyze non-Gaussian noise. This technique accurately reconstructs noise spectra, improving qubit performance in noisy quantum systems.

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Area of Science:

  • Quantum Control
  • Quantum Information Science
  • Spectroscopy

Background:

  • Characterizing noise is crucial for quantum technologies.
  • Non-Gaussian noise poses unique challenges for quantum systems.
  • Existing methods have limitations in spectral bandwidth and resolution.

Purpose of the Study:

  • Introduce open-loop quantum control protocols for non-Gaussian noise characterization.
  • Enable spectral reconstruction over extended bandwidths.
  • Overcome limitations of existing spectroscopic schemes.

Main Methods:

  • Engineering multidimensional frequency combs using pulse sequences.
  • Relating high-order spectra to observable qubit probe properties.
  • Utilizing high time resolution for spectral reconstruction.

Main Results:

  • Demonstrated non-Gaussian spectroscopy for classical quadratic dephasing.
  • Applied the method to a quantum spin-boson model out of equilibrium.
  • Achieved accurate spectral reconstructions predicting qubit dynamics.

Conclusions:

  • Open-loop quantum control provides a powerful tool for non-Gaussian noise analysis.
  • High time resolution is essential for broad spectral characterization.
  • The developed protocols accurately predict qubit dynamics under non-Gaussian noise.