Dense coding with multipartite quantum states

Details Dense coding with multipartite quantum states Dense coding with multipartite quantum states

2005-07-15

arxiv.org/abs/quant-ph/0507146v1

Int. J. Quant. Inf. 4, 415-428 (2006)

Physics

Quantum Physics

14 pages, 1 figure, RevTeX4

Scientific paper

10.1142/S0219749906001888

We consider generalisations of the dense coding protocol with an arbitrary number of senders and either one or two receivers, sharing a multiparty quantum state, and using a noiseless channel. For the case of a single receiver, the capacity of such information transfer is found exactly. It is shown that the capacity is not enhanced by allowing the senders to perform joint operations. We provide a nontrivial upper bound on the capacity in the case of two receivers. We also give a classification of the set of all multiparty states in terms of their usefulness for dense coding. We provide examples for each of these classes, and discuss some of their properties.

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