Indistinguishability and improper mixtures

Details Indistinguishability and improper mixtures Indistinguishability and improper mixtures

2001-09-27

arxiv.org/abs/quant-ph/0109146v2

Physics

Quantum Physics

4 pages. v2: Improved introduction and presentation of theorem of section 5; other small corrections; theorem nicknames change

Scientific paper

All quantum mixtures are what d'Espagnat has termed "improper." His "proper" mixture cannot be created -- if welcher weg, or distinguishing, information exists, an improper mixture results, while in the absence of such information, the resulting "mixture" is a pure state. D'Espagnat has claimed that an interpretation of the improper mixture in terms of subensembles leads to logical inconsistency; this claim is shown to be incorrect, as d'Espagnat's argument fails to account for the indistinguishability of the pure-state subensembles.

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