A Modern Approach to Quantum Mechanics · Problem 2.16

Angular Momentum — John S. Townsend

Physics — Quantum Mechanics · expectation-value-angular-momentum-photon

Problem

Use both the matrix representations of the angular momentum operator

\hat{J}_z

from Example 2.8 to determine the expectation value of the angular momentum for the photon state

a|R\rangle + b|L\rangle