Abstract Gravity mediated entanglement (GME) has been proposed as the first experimentally testable signature of quantum gravity. However, to what extent effect is due gravity under debate. In this note, we argue in several ways that observation GME does indeed tell us something new about compared previous experiments. particular, consider a reference frame treatment experiment allows pinpoint ...

We present a condition for 1=2 degree of freedom each user in constant K-user single-antenna interference channels. This is sufficient all and necessary almost channel matrices. Moreover, it applies to topologies, i.e., fully-connected channels as well that have individual links absent, reflected by corresponding zeros the matrix. captures essence alignment virtue being expressed terms generic ...

The effects of the spatiotemporal degrees freedom on practical implementation an SU(1,1) interferometer are investigated. A recently developed Wigner functional approach is used to obtain phase sensitivity such in terms all freedom. It reveals how experimental scale parameters affect performance interferometer. analysis provides information that would be useful for quantum metrology applications.