The discussion centers on the distinction between measurement and preparation in the context of the Double Slit Experiment. It is established that preparation involves creating a source of quantum systems characterized by a specific quantum state, while measurement entails extracting information from a macroscopic device, which may alter the state. The conversation highlights the role of filters in transforming quantum states and emphasizes that dissipative filters involve both preparation and measurement. The participants agree that the setup of the experiment significantly influences the outcomes and interpretations of quantum states.
PREREQUISITESQuantum physicists, researchers in quantum mechanics, and students studying the principles of measurement and preparation in quantum experiments will benefit from this discussion.
And of spin states, not of position states!vanhees71 said:Ok, that's still a superposition of states, not of "position".
Then your notation |u> and |d> stands for two spherical waves, not for two position eigenstates! And nothing at all is measured at the slits (if not energy), just prepared. There are no clicks anywhere. (Except perhaps in a detector later, which does a measurement (of the energy at the detector surface).naima said:It has nothing to do with spin!
|u> is for the upper slit.