https://www.newscientist.com/article/2337042-two-atomic-clocks-have-been-quantum-entangled-for-the-first-time/

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Two atomic clocks have been quantum entangled for the first time

Researchers have quantum entangled atomic clocks, allowing them to be
synchronised more accurately. Such entangled clocks could be used to
study dark matter and gravity more precisely

      
Physics 7 September 2022

By Karmela Padavic-Callaghan

Atomic clocks use lasers and atoms to record time extremely
accurately

Andrew Brookes/National Physical Laboratory/Science Photo Library

Two atomic clocks have been connected using quantum entanglement - a
property that intrinsically links them so that changes in one
instantaneously affect the other. The connection makes it easier to
synchronise the clocks, which could be used to make more accurate
measurements of dark matter and gravity.

Atomic clocks consist of atoms that are very precisely controlled by
lasers. Each "tick" corresponds to a frequent and measurable change
in energy that occurs in the atoms' electrons. The result is ...

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