Abstract
We show that, given a general mixed state for a quantum system, there are no physical means for broadcasting that state onto two separate quantum systems, even when the state need only be reproduced marginally on the separate systems. This result extends the standard no-cloning theorem for pure states.
- Received 8 November 1995
DOI:https://doi.org/10.1103/PhysRevLett.76.2818
©1996 American Physical Society