Physics – Quantum Physics
Scientific paper
2005-07-06
Physics
Quantum Physics
14 pages, typos corrected, para and references added in introduction, submitted to Jour. Phys. A
Scientific paper
A complete solution to the problem of setting up Wigner distribution for N-level quantum systems is presented. The scheme makes use of some of the ideas introduced by Dirac in the course of defining functions of noncommuting observables and works uniformly for all N. Further, the construction developed here has the virtue of being essentially input-free in that it merely requires finding a square root of a certain N^2 x N^2 complex symmetric matrix, a task which, as is shown, can always be accomplished analytically. As an illustration, the case of a single qubit is considered in some detail and it is shown that one recovers the result of Feynman and Wootters for this case without recourse to any auxiliary constructs.
Chaturvedi Subhash
Ercolessi Elisa
Marmo Giuseppe
Morandi Giuseppe
Mukunda N.
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