"Squashed Entanglement" - An Additive Entanglement Measure

Details "Squashed Entanglement" - An Additive Entanglement Measure "Squashed Entanglement" - An Additive Entanglement Measure

2003-08-16

arxiv.org/abs/quant-ph/0308088v3

J. Math. Phys. Vol 45, No 3, pp. 829-840 (2004)

Physics

Quantum Physics

8 pages, revtex4. v2 has some more references and a bit more discussion, v3 continuity discussion extended, typos corrected

Scientific paper

In this paper, we present a new entanglement monotone for bipartite quantum states. Its definition is inspired by the so-called intrinsic information of classical cryptography and is given by the halved minimum quantum conditional mutual information over all tripartite state extensions. We derive certain properties of the new measure which we call "squashed entanglement": it is a lower bound on entanglement of formation and an upper bound on distillable entanglement. Furthermore, it is convex, additive on tensor products, and superadditive in general. Continuity in the state is the only property of our entanglement measure which we cannot provide a proof for. We present some evidence, however, that our quantity has this property, the strongest indication being a conjectured Fannes type inequality for the conditional von Neumann entropy. This inequality is proved in the classical case.

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