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What does quantum entanglement mean? Brush up Claire's profile

I don't know if you remember last year's box office black horse "gangren Boqi". This documentary film broke through hundred million yuan with word-of-mouth, and the director made a great reputation, but it also attracted a lot of right and wrong. But recently, director Zhang Yang became famous because of a crazy article about friends circle, but do you know what quantum entanglement means?

On March 1, a 26-year-old female netizen posted a long article [director Zhang Yang I love you full text reading], recording her love story with director Zhang Yang, 51 years old. She said she was a fan of Zhang Yang at first, met him at a chance chance, and then followed him to many places. Finally, they had a relationship in Dali and met after returning to Beijing.

This article named "director Zhang Yang, I love you" quickly expanded the circle of friends. In the article, the woman called herself Sanmao reincarnation, while director Zhang Yang's previous life was Hexi, and the two were "fatalistic love".

What does quantum entanglement mean?

Many people have heard of Schrodinger's cat. But what few people know is that Schr? Dinger is actually opposing the poor cat's half dead and half alive 'superposition'. He said: if according to some physicists, a micro particle can be in the superposition state of two states at the same time, then I put poison in the box and let the state of the particle determine the life and death of the cat, isn't it that the cat is also in the superposition state of life and death? In his original words, this is a 'very absurd example'.

Einstein thought directly that the superposition state did not hold at all.

But today most physicists think Einstein is wrong. Although cats can't stack (people in love can't), particles can. Not only one particle energy, but also more than two. As long as the specific conditions are met, the two can be regarded as a whole and in the superposition state at the same time, and the particles in them can not be separated individually (strictly speaking, the state of more than two particles cannot be written as the direct product of multiple single particle states). For example, there is an entangled state, as long as there is no external interference, when particle A is in the 0 state, particle B must be in the 1 state; and when particle A is in the 1 state, particle B must be in the 0 state.

This strange connection among particles is quantum entanglement.

This event was once called "spooky action at a distance" by Einstein, and it was used to question the completeness of quantum mechanics, because this super distance action violated his principle of "localization", that is, the speed of any spatial interaction cannot exceed the speed of light. This is the famous "EPR paradox".

Unfortunately, experiments after experiments have shown that quantum mechanics is right, and Einstein is wrong. The latest experiment took place last year, when China's Mozi quantum satellite proved that quantum mechanics is still right at a space scale of 1200 kilometers. Under suitable conditions, the two particles can really produce this correlation.

Indeed, this kind of connection across space sounds very romantic and can be used as a metaphor for love.