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Observation and Delayed Choice Experiments

We can conduct another experiment. In this case, let’s make an observation of the light at the point where it passes through one slit or the other, to report back to us which path the light took prior to hitting the screen. Yet, when we do this, all of a sudden, the interference pattern vanishes. By making an observation earlier in the experiment, we have determined the position of the particle, and now it behaves more like a regular particle in motion without interference effects. Things get even stranger. Imagine if our experiment was conducted over an enormously large scale, like a two slit experiment that takes light many minutes to travel from one end of the apparatus to the other. Imagine now a photon of light is sent towards the two slits, so the experiment has started. Yet in this case, we can delay our choice of how we measure the photon. For example, if we measure the photon using a screen past the two slits, we would get an interference pattern, so the particle acted wave-like. Alternatively, if we measure the light in a way to know which slit it passed through, we produce a particle-like photon behaviour with no interference. Even delaying the experimental setup until the last split second, the particle will behave as defined by the experiment to be particle-like or wave-like. There is no definite form that the particle takes within the apparatus prior to its observation. It is truly in an indeterminate state. Only the observation, or the outcome of the experiment, results in a record in our macroscopic physical world, which makes the phenomenon real. There is no phenomenon until it is observed. #doubleslitexperiment #observer #delayedchoice #quantummechanics #interference