r/quantum • u/efsDqsszqfdf • 8d ago

Question Petite question de physique quantique

J’ai une question : si on envoie une particule intriquée à une autre particule au delà de l’horizon des événements d’un trou noir, que devient l’autre particule ? Est elle affectée ?

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u/theodysseytheodicy Researcher (PhD) 8d ago

No. Nothing you do to one particle in an entangled pair—even drop it into a black hole—has any effect on the other.

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u/ShadedRiver666 8d ago

im honestly confused as to why so many people seem to beleive that quantum entanglement somehow means ‘if i move this particle, the other one will instantaneously move in the exact same way’

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u/theodysseytheodicy Researcher (PhD) 8d ago edited 8d ago

Probably because the word "action" in "spooky action at a distance" gives that impression, and lots of public media reinforces it.

For example, Mass Effect, Three Body Problem, Ernest Cline's Armada, Charles Stross' Singularity Sky and Iron Sunrise, etc. specifically say they get FTL communication using quantum entanglement.

The National Science Foundation article on the 2022 Nobel Prize gets it wrong:

For example, if the polarization of a single photon in an entangled pair is changed, the other photon's polarization will also change instantaneously — even though the two photons may be separated by a large distance.

Other articles present it in FTL language and then use weasel words to get out of it. An article in Scientific American says:

The mysterious phenomenon known as quantum entanglement—where objects seemingly communicate at speeds faster than light to instantaneously influence one another, regardless of their distance apart—was famously dismissed by Einstein as "spooky action at a distance." New experiments could soon answer skeptics by enabling people to see entangled pulses of light with the naked eye.

Although Einstein rebelled against the notion of quantum entanglement, scientists have repeatedly proved that measuring one of an entangled pair of objects, such as a photon, immediately affects its counterpart no matter how great their separation—theoretically.

(Emphasis mine.)

So when people consult supposedly reputable sources and even they get it wrong, you can't blame the amateurs.

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u/ShadedRiver666 8d ago

you’re right, in the end its not their fault that all they reciece off the media is certain things

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u/neutrinophantom 7d ago

It's for the same reason people think that particles suddenly behave differently when you read the results of an experiment. It's a mix of grifters and poor science communication.