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What is the right way to measure gravitational redshift?

from IOP

In a paper published in Nature last year, Steven Chu and co-workers claimed that atom interferometry devices could detect gravitational redshift with a precision several orders of magnitude greater than current, and future planned, clock tests. In a study recently published in Classical and Quantum Gravity, a team of researchers, including Claude Cohen Tannoudj who shared the 1997 Nobel Prize with Chu, disagreed with these findings, stating that the atom interferometer is in fact an accelerometer that measures the acceleration of freely falling atoms with respect to the instrument that is at rest in the laboratory. more

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