Unitary Evolution Between Pure and Mixed States
Quantum Physics
2009-10-28 v4 General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
We propose an extended quantum mechanical formalism that is based on a wave operator , which is related to the ordinary density matrix via . This formalism allows a (generalized) unitary evolution between pure and mixed states. It also preserves much of the connection between symmetries and conservation laws. The new formalism is illustrated for the case of a two level system.
Cite
@article{arxiv.quant-ph/9504019,
title = {Unitary Evolution Between Pure and Mixed States},
author = {B. Reznik},
journal= {arXiv preprint arXiv:quant-ph/9504019},
year = {2009}
}
Comments
13 pages, latex. Revised version. To appear in Phys. Rev. Lett