# Particle/Anti-Particle question

Can a particle say an electron, be entangled with its antt-particle partner, a positron?
So could this happen for any particle antiparticle pair? I know that entanglement is often talked abut pertaining to photons, so could a photon and anti-photon be entangled?

Related High Energy, Nuclear, Particle Physics News on Phys.org
mathman
Yes, you certainly can entangle a particle/anti-particle pair. I don't know if this has ever been done with electrons (and, as mathman said, it's not a relevant question for photons), but take a look at the description of the BaBar and Belle experiments. Their measurements depend on entangling pairs of $$B^0/ \bar B^0$$ mesons. It's a very cool example of something that was once a novel result (EPR correlations, i.e. enganglement) becoming a tool for measureing something else (in this case, CP violation).