Recent content by daniel444

so that means, no matters which type of measurement me make, we will always have a superposition of coordinate/momentum eigenstates (wave packet) after the measurement?

so that means, the 1. postulate is wrong? Because in all quantum mechanics books is written, that after a measurement the wave function collapses in an eigenstate of the operator, which corresponds to the observable, which is being measured

Yes, exactly this I mean. I can make a me a measurement that gives a result that restricts both position and momentum to a certain range. So I´ve made such sort of a measurement. It is still a measurement. Which state takes the quantum object after this measurement? Will it be a superposition?

Dear friends please help me, for I am completely confused and can not understand the logical connection between two postulates of quantum mechanics. One postulate states, that if some observable is being measured, for instance coordinate, then the superposition of many possible states, which...

what is the reason for that the energy hypersurfaces in a phase space, which belong to systems with constant energy are closed? ( see picture )