The Greenberger-Horne-zeilinger or GHZ paradox

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On January 31, scientists from the University of Science and Technology of China published a work in which they developed a method that involved photons of light in 37 dimensions to test the Greenberger-Horne-zeilinger or GHZ paradox. Their achievement is that they have reached the conclusion that the quantum world is even stranger than we thought. I know this phrase sounds a bit repetitive, but it is getting stranger.

The GHZ paradox is complex, but we can understand it with an example; Imagine that you want to know if there is mail in your mailbox, in a typical mailbox you live in a small house and you have a mailbox outside in the post office garden, if you want to know if there is mail you just have to leave the house and take a look in the mailbox, you get to the mailbox, you open the mailbox, you take a look and you find a birthday card from your aunt, with that simple observation you can deduce many things without having experienced them.

For example, you deduce that someone from the postal service has been there, opened the mailbox, put the birthday card in, you can also deduce that your aunt bought the card days ago, wrote the message and went to the post office to send the card, you can deduce a lot of things simply by opening the mailbox, you have not experienced or seen any of those events, but you have deduced them, that has happened, that chain of events has occurred that has led to you having a greeting card from your aunt in the mailbox.

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This is called intuitive system and we can call it local realism, they also call it that in physics, it allows us to imagine a chain of events that goes from your aunt to you, each one of them moves through a series of connected places and a certain time, from your aunt buying the card to the post office and then to your address, for most scientific aspects of daily life this local realism works very well, obviously it is not useful for living day to day.

But the magicians of quantum physics arrived, from the dark world, from the tiny, and discovered that quantum reality works with completely different rules than ours and that on top of that they seem to make no sense, you could say that these rules contradict local realism, from the perspective of the quantum world before you look inside the mailbox, the universe still has to decide if there is a card inside or not, it's a bit like Schrödinger's cat, the universe also has to decide if a postal service has passed through it. there or if the aunt or if your aunt remembered your birthday, the universe even has to decide if your aunt really exists, because she could not exist in the quantum world and yet you received the card.

That's how crazy the quantum world is, physicists refer to these events in the quantum world as undecided events and their relationship to each other as entanglement, the only way to know if your aunt sent a postcard is to look at the mailbox and check it first, but before that everything in the quantum world is a complete Enigma.

Source

The images without reference were created with AI

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