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> Once you understand what’s going on with the double slit, all the other quantum effects that are allegedly mysterious or strange also make sense. Take for exa
by alex_young 5y ago
> Once you understand what’s going on with the double slit, all the other quantum effects that are allegedly mysterious or strange also make sense. Take for example a delayed choice experiment. In such an experiment, it’s only after the particle started its path that you decide whether to measure which slit it went through. And that gives the same result as the usual double slit experiment.
Delayed choice seems pretty silly in relativistic terms to me. If photons are massless, and distances they travel are 0, then there is no such thing deciding to measure the slit after the photon is emitted but before it reaches the slit, right? That's just a figment of our reference frame.
- Koshkin 5y agoBut reference frames do have physical significance (and the distance traveled does depend on one).
- alex_young 5y agoSo, from the photon’s perspective (I know perspective isn’t right, but I’m not sure what else to call it), the distance traveled is 0, and the emitting and measuring happen instantaneously right? What I’m struggling with is what it means to the experiment to move a measurement into the system between these events if they are at the same moment according to the thing being measured.
- Koshkin 5y agoA frame of reference that moves at the speed of light is non-physical. For example, using it you could conclude that objects that have non-zero mass, too, all move at the speed of light...