Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple representation of quantum process tomography   We show that the Fano representation leads to a particularly simple and
appealing form of the quantum process tomography matrix $\chi_{_F}$, in that
the matrix $\chi_{_F}$ 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 two-qubit quantum noise
channels.

11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph