Is it possible to make two separate atoms or electrons entangled on a quantum level? Not photons, those I know can be entangled already


1 Answer 1


As soon as two atoms or electrons interact with each other, they become entangled.

Say you shoot two atoms against each other in a collision experiment. At $t=0$ the atoms have a definite momentum $\hbar k$, $|\Psi \rangle = |k\rangle |-k \rangle$. After the collision, they will be in a superposition of different momenta, but the interaction is such that the total momentum must be conserved. Hence the resulting state will look roughly like this

$$ |\Psi \rangle \approx c_1 |k_1\rangle |-k_1 \rangle + c_2|k_2\rangle |-k_2 \rangle +...$$

which is an entangled state. If you want to understand why the result looks like this you should study quantum scattering theory.


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.