As stated you can’t. In the MWI picture, you are split into two one who has measured it x+, the other x-. Both must send it back to have it recohere, and they must at the same time erase their measurement of which way it went—really anything that distinguishes those two branches. They can record the fact that they did measure it, as this is the same in the two branches.
A person obviously can’t just “forget”, and will at best leak information into the environment, encoded as correlations in the noise of heat. A (reversible) computer, on the other hand, works quite well for doing this.
As stated you can’t. In the MWI picture, you are split into two one who has measured it x+, the other x-. Both must send it back to have it recohere, and they must at the same time erase their measurement of which way it went—really anything that distinguishes those two branches. They can record the fact that they did measure it, as this is the same in the two branches.
A person obviously can’t just “forget”, and will at best leak information into the environment, encoded as correlations in the noise of heat. A (reversible) computer, on the other hand, works quite well for doing this.