What is quantum entanglement?

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When you can tell something about one object by looking at another, we refer to those objects as correlated. If you pull a left shoe out of a shoebox, you can be pretty sure the other shoe will be a right shoe.
Quantum particles can share a special sort of correlation, known as entanglement, where the two objects are so strongly correlated that the properties of one cannot be described without considering the properties of another. Entanglement can be seen between quantum particles even if we separate them by vast distances, with some experiments showing entanglement surviving over hundreds of kilometres.

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15 окт 2024

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Комментарии : 9

@LendallPitts 2 года назад

The most recent demonstration that Einstein was wrong and that "spooky action at a distance" does indeed take place was by Alain Aspect in 2015. Alain is a great favorite of mine -- and quite amusing. He's on RU-vid.

@that_one_momo_guy 2 года назад

Hi there! I love that you're doing outreach! The format of short videos explaining interesting phenomena is super handy for a quick "nugget of science." That said, I have some constructive criticism. The presentation in the video seems to make it more rather than less confusing. You can measure different properties of classical objects too: the shoes could've been one worn out and one not. This would give a strong correlation among two axes (and one could similarly continue making up examples to get correlation among as many axes as one wants). This seems to perpetuate the "mystical" way of explaining quantum phenomena to non-specialists: The only difference between the classical and quantum examples, as presented, is that the latter includes technical words ("spin", "quantum") that the non-specialist doesn't know exactly. So the feeling left by it is "the difference between the two is hidden in these quirky words which you won't understand", which defeats the purpose of doing outreach in the first place. Now, I don't mean that this was the intended outcome at all, but it seems to be the outcome regardless.

@that_one_momo_guy 2 года назад

One possibility to improve it is to explain it in terms of the typical Bell game with the referee and the two parties that can't communicate. It's as artificial as taking a lonely shoe to mars, and pin-points what the weird thing actually is. (I.e.: Rather than just mentioning the correlation game in the passing, make *that* the focus of the explanation.)

@johnmatthewdonohue9866 2 года назад

Hi Felipe! Thanks for the feedback! I 100% agree that the Bell-CHSH game scenario is the best way to learn about entanglement, and usually the intro point we use for public lectures. We hope to put out longer partner videos to these soon that get into a few more relevant details (incompatible measurements, for example) that were glossed over in the 3 minute version.

@frun Год назад

Entanglement is a time period until, suddenly, you only find one sock 🧦 and have to use one of a different color.

@hosseinmashhadimoslem 5 месяцев назад

Nice, Thanks

@ruttles 2 года назад

Guys was he incorrect when he said entanglement CAN''T occur faster than the speed of light?

@QuantumIQC 2 года назад

Entanglement indeed cannot be used to communicate information faster than the speed of light. However, if we wanted to mimic the effects of entanglement, as shown in the experiments of researchers like Alain Aspect, we would need some kind of device that communicates faster than the speed of light. It's an important but subtle point: any kind of hidden-variable model that could explain or "fake" entanglement requires faster-than-light communication, but entanglement itself does not allow us to send messages faster than the speed of light.

@schmetterling4477 Год назад

Entanglement is the absence of symmetry breaking mechanisms. Does "absence" travel faster than light? No. It's already NOT there. It's NOT there ALL the time. ;-)