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For example, if I were to send |y> = 1/sqrt{2}( |H> + |V> ) photons into a polarizer with a 45 degre angle from horizontal, would the beam loose intensity? How can I calculate it on my own?

EDIT: The picture below illustrate what is happening. I am changing the base from x-y to a diagonal base. Do I loose intensity?

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# Malus law in quantum mechanics

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