4 ms·
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 a
by crispyambulance 1y 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.
- jacquesm 1y agoNot just time dilation, at those scales time apparently can flow backwards for a bit! https://arxiv.org/abs/2409.03680 https://arxiv.org/abs/2409.03680
- fsh 1y agoYes, 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.47.3554 https://journals.aps.org/pra/abstract/10.1103/PhysRevA.47.35...