So ive heard that it is impossible to use quantum entanglement for data transmission. I dont really see why. Lets say earth sends a spaceship and the spaceship has entangled particles with a meaning given to them. So if we want to send the message "Earth blown up!" we observe the particle entangled with the particle connected to that meaning on the spaceship. Wouldn't that work?
...no pandorum spoilers intended
...no pandorum spoilers intended
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EDIT: That is the point. We cannot control what the quanta do. Thus you cannot use the quantum states to send information. It is like "Entangled Dice". You roll a 6 in NY and your friend will roll a 6 in Las Vagas. He cannot use that to bet to beat the house. You both must roll at the same If you roll at different times, you get the normal distribution of numbers off the dice.
It is true your friend will know what you rolled, if you rolled at the exact same time. But there is nothing useful you can do with that information. You have as much information as if you rolled your own dice and no more.
It is impossible because we cannot control quantum events like spin.
You and your friend each have one member of an entangled particle in a closed box. You also have a synchronized atomic clock. The spin of your particle can change at random. Any time you look there is a 50 - 50 chance that the spin will be UP. So you are in New York and your friend is in LA. You have agreed that you will open the box and check the spin at noon (New York time) each day. You compare your records after 1000 checks and find that there is 100% agreement. If you saw UP your friend saw UP. If you saw DOWN your friend saw DOWN. Note that neither you nor your friend have any control over what you see. Thus, you could not use the spin of your entangled particle to send faster than light morse code
Special Relativity is safe. Just barely. But, safe none the less.
Your case fails because at random times the entangled particle sends "Earth blew up." Even when it didn't.
It is true your friend will know what you rolled, if you rolled at the exact same time. But there is nothing useful you can do with that information. You have as much information as if you rolled your own dice and no more.
It is impossible because we cannot control quantum events like spin.
You and your friend each have one member of an entangled particle in a closed box. You also have a synchronized atomic clock. The spin of your particle can change at random. Any time you look there is a 50 - 50 chance that the spin will be UP. So you are in New York and your friend is in LA. You have agreed that you will open the box and check the spin at noon (New York time) each day. You compare your records after 1000 checks and find that there is 100% agreement. If you saw UP your friend saw UP. If you saw DOWN your friend saw DOWN. Note that neither you nor your friend have any control over what you see. Thus, you could not use the spin of your entangled particle to send faster than light morse code
Special Relativity is safe. Just barely. But, safe none the less.
Your case fails because at random times the entangled particle sends "Earth blew up." Even when it didn't.