Two atomic clocks have been quantum entangled for the first time

Re:Two atomic clocks have been quantum entangled for the fir... by galangalalgol on Saturday September 10, 2022 @12:09AM (#32787731)

They are explicitly saying this will help them keep the two atomic clocks better synchronized. Which is terribly useful for radio astronomy. But it does seem like that would imply information had been transferred. If it really does work I want to see what happens when you put one in orbit for a while. Donthe differential frames of reference decohere them?

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Re:Two atomic clocks have been quantum entangled for the fir... by tbrownaw on Saturday September 10, 2022 @12:39AM (#32787840)

I'm pretty sure that setting up entanglement involves information transfer.

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Re:Two atomic clocks have been quantum entangled for the fir... by andreareina on Saturday September 10, 2022 @01:03AM (#32787934)

Sure. The article implies that post-entanglement, perturbations of one particle's state will transfer to the other, which is not the case.

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Re:Two atomic clocks have been quantum entangled for the fir... by tbrownaw on Saturday September 10, 2022 @02:54AM (#32788473)

I don't think it does?

Atomic clocks don't exactly count atomic oscillations the way a grandfather clock counts pendulum swings. They have a more normal oscillator, and then keep that calibrated by checking it against atomic oscillations measured over some relatively short time.

Thirs is a way to let those repeated short measurements be more accurate. It doesn't mean that the oscillations of the atoms in both clocks are somehow locked together over the long term.

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Re:Two atomic clocks have been quantum entangled for the fir... by andreareina on Saturday September 10, 2022 @05:12AM (#32789065)

FTA (emphasis mine): Two atomic clocks have been connected using quantum entanglement – a property that intrinsically links them so that changes in one instantaneously affect the other.

Paywall beyond there so I don't know how they entangled the clocks, I'm just responding to the popsci description of entanglement which the article repeats.

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Re:Two atomic clocks have been quantum entangled for the fir... by tbrownaw on Saturday September 10, 2022 @11:17AM (#32791391)

Ah, that's the sketchy-at-best popular description of entanglement rather than anything to do with this experiment in particular. It's wrong in that it's meant for a lay audience, and to a lay audience (I think I've heard that the quantum folks define it differently?) the word "affect" implies things like causality and information transfer.

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