# Quantum entanglement

Today I want to talk about something that, I’ve been spinning all night about how to explain it, the quantum entanglement.

Particularly you have heard many explanations about it, the main one that we have all heard is that in quantum bonding (or interlacing) is that it is to have two equal particles that have the same quantum states, so that if one is modified, “magically” Quantum of the other changes as well. This, as it is counted, has been used much like explanation in the films of science fiction to tell us as it can, a ship to light years of the Earth, to communicate with the Earth of instantaneous form.

Well, the quantum linkage itself is not that and that is why I will try to explain it without putting an equation, so, purists or my physical friends, I hope they do not throw me into the jugular.

In particle subjects we should not try to take one of these as a scattered element, at the quantum level, we take systems or what is the same a group of them. Come on, a group of particles.

Magic, when someone talks about quantum mechanics, is that the system can be described through a wave. That is, the state or states in which a system can be described through a large, complicated or sometimes (many) unresolvable equation … wave. This equation can give us with some precision or not (and this is a matter of mathematics) the values ​​of their characteristics depending on how good we are to solve the system of equations (differential) knowing that many have no solution in themselves and we have That “get closer”. And so far the little introduction about quantum mechanics.

Due to the equations we generate from the wave for the particle system we have certain properties “tied”. This is pure mathematics and a bit of physics since what we do physicists is to put “conditions” that are equations that, in the system of equations that we have, in the end, we can have solutions. That is, the system is “solvable” (that is why algebra that people hate so much is so important, to know what things to get help and what not).

In this burubuyo (burubuyo mean a mesh) of equations I find that to keep the coherence of everything to the physicist I jump something. As the system has to have a consistency we had a very entertaining effect and it is that the particles that form the system had to be affected all at once or the equations were going to be taken by the ass. This is the entanglement.

Because, in wave equations, things go in pairs (some properties), it was thought that the particles that make up the system have to share the equation for that pair. Thus, the typical example is that if the system has a particle with a certain wave function that has positive spin, there must be another with negative spin in the same wave function (go roll that I have told you) and, therefore Whether, for any circumstance this was changing spin, to maintain the coherence of the system, the other should also change its spin if or if. Either that, or the “total” equations would go up in the ass and we would get into a very bad thing called paradox.

So, if you have seen the news (no, because we are all interrupted) you will know that the Chinese have launched the first satellite of quantum communication based on this phenomenon. This communicates with the Earth with a laser in which photons biar from time to time biar the one of its “pair” the speed to which it makes the change has to be c. Another story is that, as they are close by, it seems instantaneous. But it is not, it has speed limits by the general theory of relativity.

So, if you have seen the news (no, because we are all aTrumped, filled with Trump news) you will know that the Chinese have launched the first satellite of quantum communication based on this phenomenon. This communicates with the Earth with a laser in which photons are intertwined from time to time that a quantum property is known so that if it is modified at either point, the other will know “immediately” (Speed ​​of light) and perform the opportune operations. But from there to the nonsense I’ve been reading about how this is going to revolutionize communications … there is a long stretch because people have a very fat mess about what is quantum entanglement, when , As you will have read, is something “simple” to understand.

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