Entanglement Swapping Chains for General Pure States

Details Entanglement Swapping Chains for General Pure States Entanglement Swapping Chains for General Pure States

2000-06-29

arxiv.org/abs/quant-ph/0006132v1

Phys. Rev. A 62, 052315 (2000)

Physics

Quantum Physics

18 pages, 5 figures

Scientific paper

10.1103/PhysRevA.62.052315

We consider entanglement swapping schemes with general (rather than maximally) entangled bipartite states of arbitary dimension shared pairwise between three or more parties in a chain. The intermediate parties perform generalised Bell measurements with the result that the two end parties end up sharing a entangled state which can be converted into maximally entangled states. We obtain an expression for the average amount of maximal entanglement concentrated in such a scheme and show that in a certain reasonably broad class of cases this scheme is provably optimal and that, in these cases, the amount of entanglement concentrated between the two ends is equal to that which could be concentrated from the weakest link in the chain.

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