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Quoting, "Spin is the simplest example — two photons would either be (+1 and -1) or (-1 and +1), two electrons would either be (+½ and -½) or (-½ and +½) — and you don’t know which is which until you measure it" Source: https://medium.com/starts-with-a-bang/ask-ethan-whats-so-spooky-about-quantum-entanglement-e62c35ba339d

Question: The above states of photon polarization: (+1 and -1) relates to entangled state of 01+10 and is understandable for conservation of ang. momentum.

How is the state 00+11 realized in terms of polarization. Does not having two photons with (+1 and +1) violate conservation of ang. momentum?

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Given that you're already happy with producing $|01\rangle+|10\rangle$, it's enough to see how another state such as $|00\rangle+|11\rangle$ can be made out of the first one. This just requires the introduction of a bit of kit known as a half wave plate. It pretty much just swaps 0 and 1 and vice-versa, so you apply it on just one of the photons.

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