paper

Catalytic majorization and norms

arXiv:quant-ph/0702153 · doi:10.1007/s00220-007-0382-4

Abstract

An important problem in quantum information theory is the mathematical characterization of the phenomenon of quantum catalysis: when can the surrounding entanglement be used to perform transformations of a jointly held quantum state under LOCC (local operations and classical communication) ? Mathematically, the question amounts to describe, for a fixed vector , the set of vectors such that we have for some , where denotes the standard majorization relation. Our main result is that the closure of in the norm can be fully described by inequalities on the norms: for all . This is a first step towards a complete description of itself. It can also be seen as a -norm analogue of Ky Fan dominance theorem about unitarily invariant norms. The proofs exploits links with another quantum phenomenon: the possibiliy of multiple-copy transformations ( for given ). The main new tool is a variant of Cramér$ theorem on large deviations for sums of i.i.d. random variables.

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