Direct estimation of decoherence rates

@article{Buvzek2012DirectEO,
  title={Direct estimation of decoherence rates},
  author={Vladim'ir Buvzek and Peter Rap{\vc}an and Jochen Matthias Rau and M{\'a}rio Ziman},
  journal={Physical Review A},
  year={2012},
  volume={86},
  pages={052109}
}
The decoherence rate is a nonlinear channel parameter that describes quantitatively the decay of the off-diagonal elements of a density operator in the decoherence basis. We address the question of how to experimentally access such a nonlinear parameter directly without the need for complete process tomography. In particular, we design a simple experiment working with two copies of the channel, in which the registered mean value of a two-valued measurement directly determines the value of the… 
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