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    What counts as an observation in QM?

    Why post links to articles that cannot be read online for free ? and the title does not sound like a consensual position. The concept of observation in QM indeed first appears as fuzzy and undefined. But it is only so as long as you keep applying the equations to a small isolated system. In...
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    EPR thought experiment.

    According to John Baez's page of Open questions in Physics, I would describe things like this : QM does not predict anything like a preference for [either "horizontal" or "vertical"] polarization over diagonal polarization, because there is not such a thing as a possible measurement whose...
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    How is Entanglement Created?

    If you look for a process that can produced entangled particles, a natural one is to take a pair of electrons and separate them passively in a spatial manner without using a magnetic field. Then their spins are entangled (opposite to each other in any direction of measurement). Still it is not...
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    Conceptual underpinning(s) of the QM projection postulate

    In my opinion the only reasonable interpretation is the "Mind makes collapse" interpretation. I explained this starting with introductions of metaphysics, noting that purely mathematical laws of physics can only describe a mathematical universe, with a merely mathematical existence. There...
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    Online Quantum Physics courses

    I have written a simple but rigorous introduction to quantum physics expressing the core concepts of quantum states and measurements and their paradoxical aspects in a geometric language (making the mathematical consistency of the theory seem rather intuitive despite the paradoxes). This does...
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    Working on a movie and have a question on observer and double slit experiment

    What we can say may depend on some specific aspects of the experiment considered. If you consider just one closed physical system then we can say yes, physically, the observation of its state requires to physically interact with it, and thus affect it. For example if you have one electron and...