Recent content by Yuras

That's true of course. But I don't quite see what's your point. I mean, any measurement involves some kind of macroscopic property, doesn't it? E.g. pointer angle, state of digital display, height of mercury etc. Do you mean that change of temperature of the gas is not related to energy of...

Thank you! Let me rephrase it to make sure I understand it correctly. When photon interacts with the atom, we get ##\ket{E_0}\otimes\ket{photon\space is\space not\space absorbed} + \ket{E_1}\otimes\ket{photon\space is\space absorbed}##. And energy eigenstates are selected later, when we pass...

Hmm, indeed. Thanks! Why is it energy eigenstate though? Why not e.g. momentum eigenstate or position eigenstate?

Let's say atom has two energy levels, ##E_1## and ##E_2##. If atom is in the first state ##|E_1\rangle##, then it's able to absorb a photon with energy ##E_2-E_1##, while transitioning to the second state ##|E_2\rangle##. In atom's spectrum we can see an absorption line at the corresponding...