Are Bound States Always Entangled in Quantum Mechanics?

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SUMMARY

In quantum mechanics, bound states of particles are typically entangled due to their strong coupling. While entangled states do not necessarily imply that the particles are bound, bound particles exhibit behaviors indicative of entanglement. For instance, light atoms follow LS coupling, which means that analyzing an electron in isolation results in a loss of information about the entire atom. This relationship underscores the interconnectedness of particles within bound states.

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metroplex021
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Hi folks -- quick question. I appreciate that entangled states in quantum mechanics may not be bound states. But when we have bound states, are the particles always entangled with one another?

Thanks a lot!
 
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Depending on who you ask, everything is entangled. But, yeah, particles that are bound together are very strongly coupled and will behave as entangled. For example, light atoms usually obey LS coupling, so you lose information if you just look at the electron alone and not the full atom.
 

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