Extending comb-based spectral estimation to multiaxis quantum noise

@article{PazSilva2019ExtendingCS,
  title={Extending comb-based spectral estimation to multiaxis quantum noise},
  author={Gerardo A. Paz-Silva and Leigh M. Norris and Felix Beaudoin and Lorenza Viola},
  journal={Physical Review A},
  year={2019}
}
We show how to achieve full spectral characterization of general multiaxis additive noise. Our pulsed spectral estimation technique is based on sequence repetition and frequency-comb sampling and is applicable even to models where a large qubit energy-splitting is present (as is typically the case for spin qubits in semiconductors, for example), as long as the noise is stationary and a second-order (Gaussian) approximation to the controlled reduced dynamics is viable. Our new result is crucial… 
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