State redistribution as merging: introducing the coherent relay

Details State redistribution as merging: introducing the coherent relay State redistribution as merging: introducing the coherent relay

2008-05-07

arxiv.org/abs/0805.1065v1

Physics

Quantum Physics

1 colour figure, circuit diagram available upon request

Scientific paper

State redistribution allows one party to optimally send part of her state to another party. Here we show that this can be derived simply from two applications of coherent state-merging. This provides a protocol whereby a middle party acts as a relay station to help another party more efficiently transfer quantum states. This also gives a protocol for state splitting and the reverse Shannon theorem (assisted or unassisted by side information), and allows one to use less classical communication for partial state-merging using a sub-protocol we call ebit repackaging. Thus state-merging generates the other primitives of quantum communication theory, reducing the hierarchy between members of the first family of quantum protocols.

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