https://www.quantamagazine.org/an-atomi ... d21d14a9ea
This is just a small scale measurement of gravitational redshift.
Now where this technology is heading is another matter:
Now that WOULD be something worthy of the hype in the title and the article.Take the case where a massive object is put into a superposition of two possible locations at the same time. General relativity says that any object with mass should bend the fabric of space-time. But what if that object is in a superposition? Is the geometry of space-time also in a superposition?
So we're a few years premature.....If Ye’s team improves their clock’s sensitivity by about another factor of 10 — a few years from now, at the current rate of improvement — they can start searching for gravitational effects in the behavior of their atoms. The first signatures of this would appear in a process called decoherence.