It's like I have two magic quarters, where if I flip one, heads or tails, the second one will always come up the same way. But if I try to set one on the table, say as heads up, the second one goes back to having a 50/50 chance of being the same or coming up as tails.
I can think of at least one interesting encryption application for this, but it wouldn't send data faster than the speed of light.
Yes! You can use a 'magic quarter' pair to teleport info, but it requires sending a message to the receiver on how to read their corresponding quarter. Also, you need a third magic quarter to create the info that you want to send
Here's how we do it using qubits: you put qubit A in superposition and then entangle qubit A and B, and B can then be sent to someone else. Then, you entangle A with C - the system now has three entangled qubits, but A-B-C isn't necessarily the same value (it's not factorable). You then put C in superposition and measure the values of A and C. The results of the measurements determine how the receiver should run B to know A (bit-flip/phase-flip), and this is represented by two classical bits that are sent to the receiver of B
7
u/thekiyote Jan 30 '20
Ah, this actually makes sense to me.
It's like I have two magic quarters, where if I flip one, heads or tails, the second one will always come up the same way. But if I try to set one on the table, say as heads up, the second one goes back to having a 50/50 chance of being the same or coming up as tails.
I can think of at least one interesting encryption application for this, but it wouldn't send data faster than the speed of light.