I'm watching a series of lectures on QM and the last one dealt with entaglement. You can see it http://www.youtube.com/watch?v=IAgV-LKTiMI&feature=channel" if you want. I understand it in the purely theoretical sense. It's a very neat concept. Naturally, my next question is, how would you physically entangle two electrons? What is the experimental set up for adding angular momentum or spin operators of two separate Hilbert spaces?