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crispyambulance | 4 months ago

They mention a "quantum noise limit", that must be the ultimate precision that is physically possible, right?

What is this ultimate precision? I imagine that at some point, even the most modest relative motion at ordinary velocities would introduce measurable time dilation at fine enough clock precision.

discuss

order

fsh|4 months ago

Yes, there is a limit called "quantum projection noise" that determines how much frequency stability one can achieve with a single-atom clock [1]. With N independent atoms, this limit gets smaller by 1/sqrt(N), but with N entangled atoms one can achieve a 1/N scaling. This is the ultimate limit (Heisenberg limit).

[1] https://journals.aps.org/pra/abstract/10.1103/PhysRevA.47.35...