Entanglement swapping for generalized non-local correlations

Details Entanglement swapping for generalized non-local correlations Entanglement swapping for generalized non-local correlations

2005-08-16

arxiv.org/abs/quant-ph/0508120v1

Physics

Quantum Physics

10 pages, 5 figures

Scientific paper

We consider an analogue of entanglement-swapping for a set of black boxes with the most general non-local correlations consistent with relativity (including correlations which are stronger than any attainable in quantum theory). In an attempt to incorporate this phenomenon, we consider expanding the space of objects to include not only correlated boxes, but `couplers', which are an analogue for boxes of measurements with entangled eigenstates in quantum theory. Surprisingly, we find that no couplers exist for two binary-input/binary-output boxes, and hence that there is no analogue of entanglement-swapping for such boxes.

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