Conditions for a class of entanglement transformations

Details Conditions for a class of entanglement transformations Conditions for a class of entanglement transformations

1998-11-20

arxiv.org/abs/quant-ph/9811053v2

Physical Review Letters, Vol 83 (2), pp 436--439 (1999)

Physics

Quantum Physics

4 pages. Title and some nomenclature changed. Minor errors fixed

Scientific paper

10.1103/PhysRevLett.83.436

Suppose Alice and Bob jointly possess a pure state, $|\psi\ra$. Using local operations on their respective systems and classical communication it may be possible for Alice and Bob to transform $|\psi\ra$ into another joint state $|\phi\ra$. This Letter gives necessary and sufficient conditions for this process of entanglement transformation to be possible. These conditions reveal a partial ordering on the entangled states, and connect quantum entanglement to the algebraic theory of majorization. As a consequence, we find that there exist essentially different types of entanglement for bipartite quantum systems.

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