# Tag Info

## New answers tagged observables

2

So now I'm wondering the following: is this the definition of a wavefunction or is there a wavefunction for every observable, being this wavefuntion just a map from the possible values of the observable to their probability amplitudes? There is indeed a wavefunction for every observable. The state $|\psi\rangle$ is a vector in a complex Hilbert space. ...

3

Really, there is one wavefunction that runs over all compatible observables, and it's time evolution is governed by the Schrodinger equation with some Hamiltonian. But often times certain observables don't interact much, so you can just treat them as a system in isolation. You can imagine the Hamiltonian as being a matrix acting on some vector space, and if ...

2

The is a theorem that says Hermitian operator are associated to real eigenvalues. Since eigenvalues correspond with our measure values and they are real, this means that it makes sense to have hermitian operators as observables. Also, what type of observables are we talking about here? Particles? Observables are magnitudes we can measure: position, ...

0

Consider an EPR experiment where an entangled pair of electrons is created. One of them hits a detector which finds its spin to be up. The other hits a detector at some distance. The first detector sends a light signal to the vicinity of the distant detector. That signal arrives before the other electron. Near that second detector sit two observers. ...

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