A general scheme for ensemble purification

Details A general scheme for ensemble purification A general scheme for ensemble purification

2002-06-26

arxiv.org/abs/quant-ph/0206183v2

Phys.Lett. A309 (2003) 24

Physics

Quantum Physics

7 pages, LaTeX. Revised version: typographical errors corrected

Scientific paper

10.1016/S0375-9601(02)01670-5

We exhibit a general procedure to purify any given ensemble by identifying an appropriate interaction between the physical system S of the ensemble and the reference system K. We show that the interaction can be chosen in such a way to lead to a spatial separation of the pair S-K. As a consequence, one can use it to prepare at a distance different equivalent ensembles. The argument associates a physically precise procedure to the purely formal and fictitious process usually considered in the literature. We conclude with an illuminating example taken from quantum computational theory.

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