Читать книгу Quantum Mechanics, Volume 3 - Claude Cohen-Tannoudji - Страница 33
B-2. Expression in terms of the operators a and a†
ОглавлениеWe choose a basis {|ui〉} for the individual states. The matrix elements fkl of the one-particle operator are given by:
(B-3)
They can be used to expand the operator itself as follows:
