English Version

Intro

Hello dear reader and  welcome back to the weird world of quantum physics where nobody understands what is going on and we realize how different the world is from our simple understanding.

The Phenomenon 

This time we are talking about the odd and very strange phenomenon of quantum entanglement.To simplify things we first need to understand a few things.

Firstly, none of what we are about to say is gonna make sense in the normal world (the word that obeys the laws of classical physics ) . When we go to the small world of electrons and photons it’s important to understand that this world follows its own rules.

Secondly, in quantum physics atoms behave differently when they are measured like what we have described in the previous article that talked about the double slit theory, for example we can say an atom is everywhere in the available space at same time until we actually measure where it is and when we do, we know that it is only in this place (that is how it works down here we don’t know anything for certain it’ all just probabilities ).

Now that we know that information we can start understanding the phenomenon.Electorns are described in the quantum physics world by 4 parameters one of those parameters is a property called spin. We can say that a particle after it’s measured has a up spin or a down spin, you must have noticed that i said after it has been measured that is because we know that as long as the property is not measured the particle stays in a superposition where it has spin up and down at the same time.

The idea of entanglement comes when we have two different particles that are somehow related to each other(entangled) and the result of the first particle affects the result of the second particle. In simpler terms if we measure the first particle and we know it has up spin when we measure the second particle it will always have down spin (depending on how they are entangled) and this effect happens no matter where those two particle are even if one is on earth and the other is in a different galaxy they will always give the same result, and here is where the scientists started to debate.They all have observed the results and no one can deny the existence of the phenomenon but they started debating on why this is happening, what is making these particles to behave in such strange matter.

The debate started when the famous scientist Albert Einstein thought up an experiment like this in 1935, in collaboration with two younger scientists, Boris Podolsky and Nathan Rosen.They believed superposition was impossible because information cannot travel instantaneously. So they thought there must be hidden variables that caused the information to travel from one particle to another at a speed that is faster than the speed of light and Einstein’s inability to understand the reason for the phenomenon he called it Spooky Action At a Distance (our title ). But Danish physicist Niels Bohr said that Einstein was just wrong. 

Scientists remained divided until in 1964, Irish physicist John Bell figured out how to set up an experiment and he called it Bell’s inequality, to determine who was right. Bell proved that quantum mechanics predicted stronger statistical correlations in the outcomes of  some measurements than any hidden variable theory could so he has proven Einstein and his colleagues wrong and supported the theory of Niels Bohr. 

Now there is a question to be raised: How are two particles entangled? You can entangle two photons from birth by producing them from the same chemical reaction like in lasers or you can bring two quantum objects very close together until one starts having effects on the other.

Ending

And that brings us to the end of it the usages of quantum entanglement on our modern day technology are a lot from synced clocks to encryption of data and who knows what the future has in storage for these technologies