Probably I should say a bit more on what is quantum entanglement. Imagine having two boxes. In each of the boxes is a cat. Box #1 has a white cat is sitting inside, and box #2 has a gray cat inside. You know there are only two boxes and only these two cats. No more extra stuff. Now, your friend closes the boxes and moves them around so you don’t know where is which anymore. Your friend asks you to open any of the boxes. You open and see the grey cat. This means that in the second box the white cat is sitting. This phenomenon is called entanglement. We say that two boxes were entangled. Same in quantum physics. You have two entangled qubits. If you know anything about qubit 1, you automatically know everything about qubit 2. This is used in black hole scrambling effect described in the previous post. You can simulate “sending” entangled qubit inside a black hole, and knowing something from Hawking photon to reveal something else inside the black hole.