Noncommuting mixed states cannot be broadcast
Quantum Physics
2009-10-28 v1
Abstract
We show that, given a general mixed state for a quantum system, there are no physical means for {\it broadcasting\/} that state onto two separate quantum systems, even when the state need only be reproduced marginally on the separate systems. This result generalizes and extends the standard no-cloning theorem for pure states.
Cite
@article{arxiv.quant-ph/9511010,
title = {Noncommuting mixed states cannot be broadcast},
author = {H. Barnum and C. M. Caves and C. A. Fuchs and R. Jozsa and B. Schumacher},
journal= {arXiv preprint arXiv:quant-ph/9511010},
year = {2009}
}
Comments
11 pages, formatted in RevTeX