
Quite likely, but we'll also never know. Such systems are some of the most heavily guarded secrets/capabilities USAF employs. I've heard stories of the B-1 testing its EW suite out west, "screwing up" entire cities (that was the term used, obviously not very specific). And this was with it flying at least on state away. Those states are obviously very big, we're not talking MA, CT or RI here..
What is clear is that these aircraft have a very robust EW suite, and given the B-52 has plenty of space for such, probably carries something similar (possibly even more capable). Since it has a much larger radar cross section, it would make a lot of sense..