Could quantum 'clocks' tread two different paths to general relativity?

A new way of probing the intersection between quantum mechanics and Einstein's general theory of relativity using interferometry has been devised by physicists in Israel. The researchers have developed a "self-interfering clock" that comprises two atomic spin states put into a quantum superposition. The researchers hope that their proof-of-principle experiment will provide new insights into the study of time, the interplay between quantum mechanics and relativity, and in particular the role that gravity could play in destroying the coherence of a quantum system.