Probing qubit by qubit: Properties of the POVM and the information/disturbance tradeoff

@article{Sparaciari2014ProbingQB,
  title={Probing qubit by qubit: Properties of the POVM and the information/disturbance tradeoff},
  author={Carlo Sparaciari and Matteo G. A. Paris},
  journal={International Journal of Quantum Information},
  year={2014},
  volume={12},
  pages={1461012}
}
We address the class of positive operator-valued measures (POVMs) for qubit systems that are obtained by coupling the signal qubit with a probe qubit and then performing a projective measurement on the sole probe system. These POVMs, which represent the simplest class of qubit POVMs, depends on 3 + 3 + 2 = 8 free parameters describing the initial preparation of the probe qubit, the Cartan representative of the unitary coupling, and the projective measurement at the output, respectively. We… 
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