- #1
omoplata
- 327
- 2
In page 26 of 'Modern Quantum Mechanics (Revised edition)' by J.J. Sakurai, equation (1.4.9), they find the [itex]S_x +[/itex] ket,
[tex]\mid S_x;+ \rangle = \frac{1}{\sqrt{2}} \mid + \rangle + \frac{1}{\sqrt{2}} e^{i \delta_1} \mid - \rangle[/tex] with [itex]\delta_1[/itex] real. What is this [itex]\delta_1[/itex]?
Furthermore, equation (1.4.8) says,
[tex]| \langle + \mid S_x ; + \rangle | = | \langle - \mid S_x ; + \rangle | = \frac{1}{\sqrt{2}}[/tex]
But if you take equation(1.4.9) and apply [itex]\langle - \mid[/itex] to it from the left, it becomes,
[tex]\langle - \mid S_x ; + \rangle = \frac{1}{\sqrt{2}} e^{i \delta_1}[/tex]
This does not match with equation (1.4.8). There's this extra factor of [itex]e^{i \delta_1}[/itex]
Could someone help me with this? Thanks a lot.
[tex]\mid S_x;+ \rangle = \frac{1}{\sqrt{2}} \mid + \rangle + \frac{1}{\sqrt{2}} e^{i \delta_1} \mid - \rangle[/tex] with [itex]\delta_1[/itex] real. What is this [itex]\delta_1[/itex]?
Furthermore, equation (1.4.8) says,
[tex]| \langle + \mid S_x ; + \rangle | = | \langle - \mid S_x ; + \rangle | = \frac{1}{\sqrt{2}}[/tex]
But if you take equation(1.4.9) and apply [itex]\langle - \mid[/itex] to it from the left, it becomes,
[tex]\langle - \mid S_x ; + \rangle = \frac{1}{\sqrt{2}} e^{i \delta_1}[/tex]
This does not match with equation (1.4.8). There's this extra factor of [itex]e^{i \delta_1}[/itex]
Could someone help me with this? Thanks a lot.