Well, the researchers have managed to pass around a box containing a cat which is both dead and alive, if that helps any.
This is just a prelude to the next step in their research. The next step will be to "special copy" a box, send one box off, then both parties look inside their boxes. If one box contains a dead cat, the other cat must be alive (copy entanglement rule). The idea is that a "man in the middle" would not be able to peek inside a box, because that ruins the box (another entanglement rule), and the other party would know it. Also, you would think that the live cat would need kitty litter whereas the dead cat doesn't, but apparently both boxes "smell" equally bad this way. Ok so you get the idea now, right? Answer yes if you're a liar.