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In: Physics

Please answer the following questions clearly. 1) If two quantum states differ only by a phase...

Please answer the following questions clearly.

1) If two quantum states differ only by a phase factor, are they considered the same ? if so in what sense ?

2) Explain entaglement quickly?

3) why is the composite of quantum states is given by a tensor product whereas the composite of a classical states is given by a Cartesian product?

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