Simple representation of quantum process tomography

Giuliano Benenti, Giuliano Strini
2009 Physical Review A. Atomic, Molecular, and Optical Physics  
We show that the Fano representation leads to a particularly simple and appealing form of the quantum process tomography matrix χ__F, in that the matrix χ__F is real, the number of matrix elements is exactly equal to the number of free parameters required for the complete characterization of a quantum operation, and these matrix elements are directly related to evolution of the expectation values of the system's polarization measurements. These facts are illustrated in the examples of one- and
more » ... amples of one- and two-qubit quantum noise channels.
doi:10.1103/physreva.80.022318 fatcat:3lkjvvt6rbcdda5kbava24uehe