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- Thread starter Dragonfall
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Usually the state is coupled to another system, say, [tex]\left|\rho\right\rangle_\mathrm{copy}[/tex] which then gets changed through some interaction to reflect the original state. If you destroy the original state but still want two identical copies, you'll need a third system, but the details are the same.

The way you phrased the question, you could use a polarizer to correctly identify which orthogonal state a photon was in (assuming you restrict your photons to either state). Of course, you can't make a cloning device out of this.

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I know I sound pedantic but it's for a reason. One can spend forever looking for an answer to an ill-posed question.

However, I misread the question about the states being non-orthogonal. I will ponder.

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For instance, if the two states are photons polarized at [tex]30^\circ[/tex] and [tex]45^\circ[/tex], then simply produce more photons and align your polarizers in one of those two orientations.

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But if you "know" the state, it's trivial!

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