Physics – Quantum Physics
Scientific paper
2007-12-17
Physics
Quantum Physics
accepted for publication in J. Phys. A: Math. and Theor
Scientific paper
10.1088/1751-8113/41/5/055305
By using the localized character of canonical coherent states, we give a straightforward derivation of the Bargmann integral representation of Wigner function (W). A non-integral representation is presented in terms of a quadratic form V*FV, where F is a self-adjoint matrix whose entries are tabulated functions and V is a vector depending in a simple recursive way on the derivatives of the Bargmann function. Such a representation may be of use in numerical computations. We discuss a relation involving the geometry of Wigner function and the spacial uncertainty of the coherent state basis we use to represent it.
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