On violation of the superselection rules
โ
Elihu Lubkin
๐
Article
๐
1970
๐
Elsevier Science
๐
English
โ 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