English: Illustration of photon entanglement.
If, given the state Failed to parse (syntax error): {\displaystyle \left{{!}}\Psi\right\rang = \left{{!}}2,V\right\rang \left{{!}}1,H\right\rang }
, we carry out a test of vertical polarization on the photon on the right and a test of horizontal polarization on the photon to the left, we know that both of them will pass with certainty.
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