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for unbound singlets usually assumed the use of two antiparallel spin-1/2 electrons. However, actual experiments have tended to focus instead on using pairs of spin 1 photons. While the entanglement effect is somewhat less pronounced with such spin 1 particles, photons are easier to generate in correlated pairs and (usually) easier to keep in an unperturbed quantum state.

Mathematical representations

The ability of positronium to form both singlet and triplet states is described

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