Noncommuting Mixed States Cannot Be Broadcast
- 8 April 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 76 (15) , 2818-2821
- https://doi.org/10.1103/physrevlett.76.2818
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.Keywords
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