I have read the following three simplifications in various places, but together they give a contradiction, so at least one of them must be an(adsbygoogle = window.adsbygoogle || []).push({}); simplification. Which one?over

(a) Interaction between two systems A and B is described by A[itex]\otimes[/itex]B

(b) An entangled state C is a pure state, and hence there does not exist A and B such that A[itex]\otimes[/itex]B = C

(c) By appropriate interactions one can produce entangled states.

Thanks.

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# Which of these statements about tensor products is incorrect?

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