Inequalities for quantum channels assisted by limited resources

Details Inequalities for quantum channels assisted by limited resources Inequalities for quantum channels assisted by limited resources

2004-06-15

arxiv.org/abs/quant-ph/0406111v3

Phys. Rev. A 71, 062332 (2005)

Physics

Quantum Physics

8 pages, 4 figures (references updated, minor changes)

Scientific paper

10.1103/PhysRevA.71.062332

The information capacities and ``distillability'' of a quantum channel are studied in the presence of auxiliary resources. These include prior entanglement shared between the sender and receiver and free classical bits of forward and backward communication. Inequalities and trade-off curves are derived. In particular an alternative proof is given that in the absence of feedback and shared entanglement, forward classical communication does not increase the quantum capacity of a channel.

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