what is differences between collapse,reduction, decoherence , weak projection and strong projection in quantum measurement theories?
They are different words for describing different ideas about QM.
i.e. "collapse" refers to the way the wavefunction changes once a measurement has been made.
Looking up the definitions of the terms should give you a good idea. What did you find?
In the Schrödinger picture, a time dependent state ket gets projected onto a time independent eigenket of the observable. In the Heisenberg picture, this time (in)dependency is reversed.According to Schrodinger the state vector evolves with time and collapse is a jump to another temporal curve. I never found a corresponding description in Heisenberg picture.
Simon Bridge said:So you already knew the answer - well done!
No, it didn´t know the answer, it is a typical situation people asking on a forum not know the answers to them. And it is typical too that people that write is to answer it. Maybe you could try it sometime, Simon.
On the contrary, it is very common that people pose questions when they do know the answer - they may not realize they knew all along or lack confidence in their knowledge and just need help making the connection.No, it didn't know the answer, it is a typical situation people asking on a forum not know the answers to them.
...please read post #2 (above) and check the author credit. Thank you.And it is typical too that people that write is to answer it. Maybe you could try it sometime, Simon.
Yes, simply use the time-dependent eigenstates (of O2) I talked about in my previous post.At time t = 0 suppose i find that an obervable O1 has a given value. time goes from 0 to t, O1 (0) evolves to O1 (t) and i make another mesurement. Can i avoid to return to Schrodinger point of view to find the probabilities for each eigenvalues of O2?