-1
$\begingroup$

Lets say you have two entangled particles (A,B) and you already measured theirs spins and know that A has z+ and B has z-

What will happen if after the measurement you will set the spin of B to z+ (don't know if this is possible, but lets say that yes), will the spin of A change to opposite?

$\endgroup$
  • 1
    $\begingroup$ If $A$ is in the state $z^+$ and $B$ is in the state $z^-$, then the pair is in state $z^+\otimes z^-$, which is (obviously) not entangled. $\endgroup$ – WillO Sep 4 '15 at 1:54
0
$\begingroup$

No, but you can't really do that pre-measurement when they are entangled either.

See ("FTL" Communication with Quantum Entanglement?) for a more-general explanation I recently did about what quantum entanglement is; it may help demystify the basic idea of what entangled systems do together.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.