It is mentioned that subsystems don't have a wave function, in general. If two subsystems are entangled, there can be a wave function for the composite system, but not for each subsystem.(adsbygoogle = window.adsbygoogle || []).push({});

Let's say you have two entangled photon pair.. it has a wave function but not for each separate photon.. but then a photon as quantum stuff always have a wave function.. you can entangled one of the photons to another quantum object.. so how can you state the subsystem has no wave function?

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# B Subsystem has no wave function

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