Estimating purity in terms of correlation functions
Quantum Physics
2009-11-10 v1
Abstract
We prove a rigorous inequality estimating the purity of a reduced density matrix of a composite quantum system in terms of cross-correlation of the same state and an arbitrary product state. Various immediate applications of our result are proposed, in particular concerning Gaussian wave-packet propagation under classically regular dynamics.
Cite
@article{arxiv.quant-ph/0304103,
title = {Estimating purity in terms of correlation functions},
author = {Tomaz Prosen and Thomas H. Seligman and Marko Znidaric},
journal= {arXiv preprint arXiv:quant-ph/0304103},
year = {2009}
}
Comments
3 pages