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How is quantum simultaneity compatible with relativity?

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When an entangled particle “collapses”, physics says that the other particle collapses simultaneously.

But that’s non compatible with relativity, which says that simultaneity depends on the place and velocity of the observer.

 

Events A, B, and C occur in different order de...
Events A, B, and C occur in different order depending on the motion of the observer. The white line represents a plane of simultaneity being moved from the past to the future. (Photo credit: Wikipedia)

 

So the question is:
– How can quantum disentanglement simultaneity be compatible with relativity? Do the entanglement state is dependent on the observer, in the mean that a pair of particles can be entangled for one observer and collapsed to other?
– What experiments fundament the answer? Is the answer only theoretical?

 

Asked Marraco

 

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