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