What is the purpose of introducing the spin state along H

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SUMMARY

The discussion centers on the introduction of the spin state along the H axial in quantum mechanics, specifically referencing Rabi's equations. It is established that the choice of quantization axis is arbitrary, and aligning it with the field axis simplifies calculations by eliminating the coupling of different m states due to the field. This approach enhances clarity and efficiency in quantum state analysis.

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The more detail you can see the attachment. I don't understand why Rabi translate the state along z axial to H axial as shown the equations (8).
 

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The choice of quantization axis is purely arbitrary, and calculations are much simpler when the quantization axis is chosen parallel to the field axis. That way, you remove the coupling of different ##m## states due to the field.
 
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DrClaude said:
The choice of quantization axis is purely arbitrary, and calculations are much simpler when the quantization axis is chosen parallel to the field axis. That way, you remove the coupling of different ##m## states due to the field.
Thank you!
 

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