Almost a century past, has the Copenhagen Interpretation (CI) undergone any modification? In other words, has any of its underlying principles been reformulated since?
The notable (usual) examples that come to mind when one brings up CI, can be among the followings:
- Collapse of the wavefunction (often considered as too hand-wavy as the concepts of collapse and the necessaity of "wave" mechanics in QM are questionable)
- Physical distinction of "observation", "interaction" and "measurement" of quantum systems.
- Decoherence of the superposition of states and Bohr's correspondence principle
Please feel free to touch upon any of the above aspects of CI.