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On violation of the superselection rules: Elihu Lubkin. Dept. of Physics, Univ. of Wisconsin


Publisher
Elsevier Science
Year
1969
Tongue
English
Weight
75 KB
Volume
55
Category
Article
ISSN
0003-4916

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On violation of the superselection rules
โœ Elihu Lubkin ๐Ÿ“‚ Article ๐Ÿ“… 1970 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 727 KB

0 ... 0 1, (Q, Qi form an additive system of quantities), if [Q, P] = 0 (superselection rule), and if the reduced density matrix pi is obtained from the density matrix P by tracing out over the j-spaces, j -f i, then [qi , pi] = 0. This shows that a superselection rule for an additive quantity propa