Einstein had a problem with quantum theory: he didn't accept it.
Therefore, in 1935, together with his colleagues Podolsky and Rosen, he proposed an experiment to prove he was wrong: the EPR experiment (referring to the initials of the three). But the results were not as expected ...
Quantum establishes that it is impossible to know, at the same time and with precision, certain data of a particle. For example, or we know your speed or position, but not both at the same time.
Another strange feature is that, simply by observing the particle, it takes on some properties. That is, the particle does not have definite characteristics just before observing it, but rather it takes them precisely because we observe it. In addition, their properties are randomly defined, they are not "programmed." It can take one or the other, and we cannot predict what will happen. We can only predict the probability of something happening or not.
This collided with the harmonic and orderly universe of Einstein, where "God does not play the dice" and chance does not exist. Our ignorance means we cannot predict what will happen. Therefore, if quantum theory does not offer answers, it is because it is wrong or incomplete.
The EPR experiment was intended to measure at the same time speed and position of a particle without directly observing it, so as not to contaminate the result.
It is common for a particle to disintegrate into two twin particles, which shoot out in opposite directions (the explanation is somewhat more complex than this, but we simplify it this way). The two new particles separate from each other, but retain identical properties.
If we measure the speed of one, we will know that of the other, since it is the same. We do not influence the result, as we have not observed the second particle directly. Thus we know the exact velocity of the second particle. Then we measure the position in the second particle and obtain that of the first without observing it, since both are equidistant from the starting point in opposite directions. The data obtained will be objective.
But it was not like that. When observing a particle, its twin is instantly influenced. There is a transmission of information between them, and it is also instantaneous. It is not that the information has traveled faster than the speed of light, but rather it is as if the physical space between the two particles did not exist.
This is quantum entanglement or quantum connection. Two particles that, at some point were united, remain in some way related. The distance between the two does not matter, even if they are at opposite ends of the universe. The connection between them is instantaneous.
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