Original article: https://www.nature.com/articles/s41586-020-3006-1One trick is to record the frequencies of multiple atoms humming all at once within a lattice consisting of hundreds of tiny atomic pendulums. Current atomic clock technologies use lasers engineered to be as stable as possible, providing each atom with an extremely similar frequency of light. By combining their collective blur, individual uncertainties average out.
This new method goes a step further in this averaging process. By connecting atoms together in a way that entangles the quantum probabilities of their spins, it's possible to redistribute the uncertainty in the system, increasing the precision in some parts at the expense of others.