I saw "Resolving the gravitational redshift across a millimetre-scale atomic sample" at ScienceDaily and now, it seems, it's up on Drudge from Vice.
The main breakthrough is in the atomic-clock, from JILA at NIST. That's the "optical-lattice" tech.
Shimon Kolkowitz reports he can get good results with a bad laser, although that wasn't the breakthrough. It did however beat the earlier record and I expect it can be used to help refine JILA.
As for anything else, Time Crystals stand to be a competitor.
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