Lawrence Berkeley National Lab
Loyola University Chicago
After a century of intense theoretical work, a variety of possibilities have surfaced for candidate models of quantum gravity, for example string theory. All of these models rest on a simple principle: that the gravitational field itself is a quantum degree of freedom, just like the electromagnetic field. But why should this be the case? Recently, a number of groups have proposed experiments probing this question. In this talk, I’ll give an overview of the basic ideas of these tests and their relation to questions about, for example, the graviton. In particular, I’ll explain a recent experimental proposal using atom interferometers by myself, Muller, and Taylor. This experiment can be used to positively verify that the gravitational field is capable of generating quantum entanglement between a pair of massive objects.