Noncommuting mixed states cannot be broadcast

Details Noncommuting mixed states cannot be broadcast Noncommuting mixed states cannot be broadcast

1995-11-08

arxiv.org/abs/quant-ph/9511010v1

Phys.Rev.Lett. 76 (1996) 2818-2821

Physics

Quantum Physics

11 pages, formatted in RevTeX

Scientific paper

10.1103/PhysRevLett.76.2818

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.

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