Physics – Quantum Physics
Scientific paper
2005-10-20
Phys.Lett.A351:1-12,2006
Physics
Quantum Physics
Submitted to Phys. Lett. A
Scientific paper
10.1016/j.physleta.2005.10.063
The mechanism of describing quantum states by standard probability (tomographic one) instead of wave function or density matrix is elucidated. Quantum tomography is formulated in an abstract Hilbert space framework, by means of the identity decompositions in the Hilbert space of hermitian linear operators, with trace formula as scalar product of operators. Decompositions of identity are considered with respect to over-complete families of projectors labeled by extra parameters and containing a measure, depending on these parameters. It plays the role of a Gram-Schmidt orthonormalization kernel. When the measure is equal to one, the decomposition of identity coincides with a positive operator valued measure (POVM) decomposition. Examples of spin tomography, photon number tomography and symplectic tomography are reconsidered in this new framework.
Man'ko Vladimir I.
Marmo Giuseppe
Simoni Andrea
Stern Ady
Sudarshan E. C. G.
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