Bounds on Negativity of Superpositions

Details Bounds on Negativity of Superpositions Bounds on Negativity of Superpositions

2007-04-05

arxiv.org/abs/0704.0757v1

Physical Review A 76,022320(2007)

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.76.022320

The entanglement quantified by negativity of pure bipartite superposed states is studied. We show that if the entanglement is quantified by the concurrence two pure states of high fidelity to one another still have nearly the same entanglement. Furthermore this conclusion can be guaranteed by our obtained inequality, and the concurrence is shown to be a continuous function even in infinite dimensions. The bounds on the negativity of superposed states in terms of those of the states being superposed are obtained. These bounds can find useful applications in estimating the amount of the entanglement of a given pure state.

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