Energy-Sensitive and "Classical-like" Distances Between Quantum States
Quantum Physics
2009-10-31 v1
Abstract
We introduce the concept of the ``polarized'' distance, which distinguishes the orthogonal states with different energies. We also give new inequalities for the known Hilbert-Schmidt distance between neighbouring states and express this distance in terms of the quasiprobability distributions and the normally ordered moments. Besides, we discuss the distance problem in the framework of the recently proposed ``classical-like'' formulation of quantum mechanics, based on the symplectic tomography scheme. The examples of the Fock, coherent, ``Schroedinger cats,'' squeezed, phase, and thermal states are considered.
Cite
@article{arxiv.quant-ph/9810085,
title = {Energy-Sensitive and "Classical-like" Distances Between Quantum States},
author = {V. V. Dodonov and O. V. Man'ko and V. I. Man'ko and A. Wuensche},
journal= {arXiv preprint arXiv:quant-ph/9810085},
year = {2009}
}
Comments
23 pages, LaTex, 2 eps figures, to appear in Physica Scripta