Re:High-dimensional orbital angular momentum entanglement ov...
by jerf on Monday March 23, 2020 @01:30PM
(#22666362)
You can't "force" collapse in a particular way. You can read UP vs. DOWN, or you can fiddle it around so you read LEFT vs. RIGHT, but there simply is no way to "measure" an outcome to be UP in the UP/DOWN direction, unconditionally, thus forcing the other side to get DOWN.
The operation you are depending on to communicate doesn't exist.
It's a bit weird that you can choose to read UP/DOWN and your counterpart can read LEFT/RIGHT, or even a bit of both by reading at an angle, but you still can't move classical bits around that way, because you can't read "RIGHT". If you do fiddle with things to force a result, the fiddling will erase the entanglement, because under the hood, in math, those two things are basically equivalent statements. If you do force something, your forced result will have no bearing on what your counterpart gets; if you force "RIGHT" all that will happen is that your counterpart will still get a 50/50 in the LEFT/RIGHT basis. You didn't communicate anything.
The operation you are depending on to communicate doesn't exist.
It's a bit weird that you can choose to read UP/DOWN and your counterpart can read LEFT/RIGHT, or even a bit of both by reading at an angle, but you still can't move classical bits around that way, because you can't read "RIGHT". If you do fiddle with things to force a result, the fiddling will erase the entanglement, because under the hood, in math, those two things are basically equivalent statements. If you do force something, your forced result will have no bearing on what your counterpart gets; if you force "RIGHT" all that will happen is that your counterpart will still get a 50/50 in the LEFT/RIGHT basis. You didn't communicate anything.