B basically isn't random (that's why quantum entanglement is intersting) but you have 3 options on when to read its state ( which you can only do once): Option

B basically isn't random (that's why quantum entanglement is intersting) but you have 3 options on when to read its state ( which you can only do once): Option 1 is that you read it before the state of A is read, in which case my undestanding is you are effectively A in this scenario. Option 2 is that the state of A has been read, but it is unkown to you yet, because of speed of light reasons. You read B, and can infer the state of A, but because A is random, no information has been transmitted. The "sender" cannot control which state of A they read, and had you not known about it, the state of B might as well be random. Option 3 is that you read B after recieving the state of A, in which case there is something useful in that only you can make sure that only the sender knew of the state of A, meaning you are effectively authenticating a message. But still no information has been transmitted faster than light, it's just a secure channel.