Hi friend. I am in a similar dilemma deciding betweenphysics and EE PhD. I am also interested in quantum information and mesoscopic physics.
You have good options either way. For UCLA EE I would see how interdisciplinary the department is with physics. Do you want to take more EE courses? Physics? Etc. same with UMD, how much interdisciplinary research opportunity is there? Look for other research topics you would be ok exploring as well--it's important to have back ups in case you switch groups.
UMD physics is very good at quantum information, they have the joint quantum institute in addition to lots of connections to the NSA, NIST, and military/defense funding. That's important for lots of quantum research. Also UMD I know produces at least some faculty (if you are interested in academia). I don't know too much about UCLA EE unfortunately. But if you like the physics side you can't go wrong with UMD.
Of course you should try to visit. Also location and weather are always things to consider.
Would you be able to help me with my decisions too if you know anything? I am deciding between UMD physics, Caltech physics, and Princeton EE, all for quantum information/mesoscopic systems