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Physics Letters A

Quantum tomograms related to momentum density

I. A. Howard, Norman Henry March

Published Nov 3, 2005• 1 citation
Publisher
DOI
10.1016/j.physleta.2005.10.093

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According to Fan—Hu's formalism (Fan Hong-Yi and Hu Li-Yun 2009 Opt. Commun . 282 3734 ) that the tomogram of quantum states can be considered as the module-square of the state wave function in the intermediate coordinate—momentum representation which is just the eigenvector of the Fresnel quadrature phase, we derive a new theorem for calculating quantum tomogram of density operator, i.e., the tomogram of a density operator ρ is equal to the marginal integration of the classical Weyl correspondence function of F † ρ F , where F is the Fresnel operator. Applications of this theorem to evaluating the tomogram of optical chaotic field and squeezed chaotic optical field are presented.
We develop a symplectic formulation of the Lagrangian Radon transform based on the transitive action of the symplectic group on the Lagrangian Grassmannian. This geometric framework naturally extends the classical notion of the marginals of the Wigner transform, viewed as elementary tomograms, to arbitrary Lagrangian subspaces. The resulting generalized tomography provides a unified treatment of position and momentum measurements related by symplectic rotations. As applications, we revisit the Pauli reconstruction problem and establish reconstruction formulas for density operators from generalized Lagrangian tomograms.