Conclusion
As a result of calculation, V-type atoms have quantum beats but -type atoms do not. This difference is caused by quantum mechanical uncertainty. A V-type atom decays to state via the emission with and . Since both transitions decayed to the same state, one cannot determine along which path each decayed, similar to Young's double-slit experiment. However, -type atoms decay to two different states. Therefore, in this case we can recognize the path, even if it decays via two emissions as does V-type. Simply, we already know the path of the emission and decay.
The calculation by QED is correct in accordance with the most fundamental principle of quantum mechanics, the uncertainty principle. Quantum beats phenomena are good examples of such that can be described by QED but not by SCT.
Read more about this topic: Quantum Beats
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