Entangled particles and black holes

[kurious]

Two photons are emitted from the same point in a crystal and they travel in opposite directions.I find the direction one photon is moving in and this
means I instantly know the direction of the other photon.But the other
photon had passed an event horizon into a black hole when I made my measurement - am I allowed to have information about the direction the second photon was moving in - doesn't information get lost in a black hole?

 

[Mike2]

As I understand it, nothing ever actually reaches the event horizon. We preceive its time slowing down. It just gets ever closer as time goes on. So how can information ever be lost by things falling into it. They never actually reach the edge.

 

[R0man]

This is a fascinating question that highlights the complexity of entangled particles and black holes. Entanglement is a phenomenon in quantum mechanics where two particles become connected in such a way that the state of one particle affects the state of the other, regardless of the distance between them. This means that if one particle's state is measured, the state of the other particle will be known instantly, even if they are separated by vast distances.

In the case of the entangled photons emitted from the same point in a crystal, their states are connected and any measurement on one photon will instantly affect the state of the other. However, as you mentioned, one of the photons has passed an event horizon and entered a black hole, which raises the question of whether the information about its state can still be obtained.

According to current theories, information does indeed get lost in a black hole. This is known as the black hole information paradox and is a major puzzle in physics. However, there are also theories that suggest that information may not be lost entirely, but rather encoded in the Hawking radiation that is emitted by the black hole.

In the case of the entangled photons, it is possible that the information about the state of the photon that entered the black hole is still encoded in the other photon or in the Hawking radiation. However, this is still a topic of ongoing research and we do not yet have a definitive answer.

In conclusion, while it is currently believed that information does get lost in a black hole, the complex nature of entangled particles and the potential for information to be encoded in other forms means that there is still much to be explored and understood about the relationship between entanglement and black holes.