Is Cambridge considered as good as harvard?

I am a chinese physics phd student studying in cambridge in uk. I am very interested in usa and want to come to work in usa for a few years after graduation. Is the university of Cambridge considered as good as harvard in the usa? Is it easy for me to come to usa?
thanks

Cambridge is better than Harvard. I'd prefer Oxford though.

honestly, for science students, we all know that these days the number of SCI papers presented by harvard every year is far larger than that of cambridge. But cambridge is still excellent. what i am concerned is that, after graduation, if i say i am cambridge phd, will harvard professors be interested in me?

If your a physics phd student I'd be going to MIT, not Harvard.

i hate the atmosphere of a pure tech institute like mit.
by the way, in the usa, is the graduation certificate as powerful as to bring you a beautiful girlfriend? it is in china. but i am not familiar with the situation in usa

illmatic, where r u from?

i mean, graduation certificate from harvard, cambridge, etc....