Characterization of tomographically faithful states in terms of their Wigner function

Details Characterization of tomographically faithful states in terms of their Wigner function Characterization of tomographically faithful states in terms of their Wigner function

2005-03-02

arxiv.org/abs/quant-ph/0503022v3

J. Opt. B 7, S408 (2005)

Physics

Quantum Physics

9 pages. IOPAMS style. Some improvements

Scientific paper

10.1088/1464-4266/7/10/030

A bipartite quantum state is tomographically faithful when it can be used as an input of a quantum operation acting on one of the two quantum systems, such that the joint output state carries a complete information about the operation itself. Tomographically faithful states are a necessary ingredient for tomography of quantum operations and for complete quantum calibration of measuring apparatuses. In this paper we provide a complete classification of such states for continuous variables in terms of the Wigner function of the state. For two-mode Gaussian states faithfulness simply resorts to correlation between the modes.

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