Main Question or Discussion Point
If we consider quantum wavefunction-collapse, when we end up in a world-thread with a specific value of the measurement outcome, has information got lost?
Yes, I was wondering about that...It depends on what do you mean by "information". Information about what?
Ok. So I mean is that the only information that gets lost? And is that a problem? Does the new state compensate for the loss of the old state?If you mean information about the state before the measurement, then yes, it gets lost.
Yes.I was imagining that when an oucome has manifested, information about the other outcomes that were possible is lost?
Yes.Ok. So I mean is that the only information that gets lost?
Not really. (But the idea of collapse is problematic for other reasons that have nothing to do with information loss.)And is that a problem?
Yes. In a sense, the new state contains the same "amount" of information.Does the new state compensate for the loss of the old state?
PatrickOne approach to solving this problem involves adding a small, random extra term to the Schrödinger equation, which allows the quantum state vector to 'collapse,' ensuring that—as is observed in the macroscopic universe—the outcome of each measurement is unique. Laloë's theory combines this interpretation with another from de Broglie and Bohm and relates the origins of the quantum collapse to the universal gravitational field. This approach can be applied equally to all objects, quantum and macroscopic: that is, to cats as much as to atoms.
In contrast with the usual interpretations of the de Broglie-Bohm (dBB) theory, we make no particular assumption concerning the physical reality of these positions; they can be seen, either as physically real, or as a pure mathematical object appearing in the dynamical equations.