Quantum communication to the past

This investigation is of the type, what would happen if we could really in this case send a message to the past? and it focuses on analyzing what quality that message would have, how much information could be transmitted and if there would be a lot of interference, would it be a message just as clear or would it be more blurry than a traditional message sent to the future, which is what we do every day on this platform.

The explanation of a scientific investigation that can be seen seconds after being published or years from now, is a study by Seth Lloyd, from the Massachusett Institute of Technology or better known as MIT, together with his colleagues, they have been working since 2010 on the topic of closed time curves and also on quantum entanglement, two elements that will be present in this research that was inspired by the movie Interstellar, specifically in the clock scene, where the protagonist Cooper, who is in the future, sends a message to his daughter who is in the past, unfortunately, the researchers do not have a time machine, so they had to create a complex simulation of a closed time curve or time loop, which would be the mechanism to send the message to the past, although to broadcast the message you need a channel and for this they used post-selected quantum teleportation, which is based on quantum entanglement, which is the basic resource of teleportation.

And to all this they added noise, that is, interference, errors, intensity losses and other elements, quantum entanglement, although it sounds so nice to entangle things, by itself it does not transmit information, but combined with post-selection, the results can simulate that transmission from the future to the past and this is where the trick is, because of all the experiments carried out, the researchers only selected those that gave the result they were looking for and no, this is not a fix, because in this case it does not It is about obtaining a result, but rather about analyzing what the transmission process is like or rather what the transmission process would be like if we could really send a message to the past.

How does this work? I give you an example to make it clearer and also so that you understand the ambition of this research. Although the scientists were inspired by the movie Interstellar, the example of the plot of the movie Groundhog Day or Trapped in Time from 1993 is more useful to understand the post-selection phase. In this movie, Bill Murray plays an initially unpleasant character who is condemned to repeat the same day, February 2, over and over again, until he manages to make the day perfect or improve as human being.

If you have not seen the film, I recommend it, it is a cult film and very pleasant to watch, it has not aged at all and with this we now have our time loop, a 24-hour loop, similar to Groundhog Day. We have a character like Bill Murray trapped inside that loop and we would also be inside the loop, but we are there voluntarily, as observing scientists. We cannot intervene directly, although we have the power to send messages to the past within the loop, so we see our character trapped repeating the same day over and over again, going crazy without knowing what to do and we decide to help him a little, sending him instructions on what he has to do to get out of the time loop.

In the film, the day restarts right at 6 in the morning, when the alarm clock rings, always with the same music, “I got you, baby”, so we see the possibility of sending messages to our unfortunate character transmitting through dreams and that would be our channel. Just before 6 in the morning we make the transmission. This means that we do the transmission within the time loop before the day restarts.

We are in the future of that time loop and we have the advantage of knowing what our character did wrong on that day, but our character receives the message when he wakes up at 6 in the morning, that is, in the past of the time loop, we have sent a message to the past within that time loop, however, the transmission does not arrive perfectly. The character only receives fragments, the dreams can be confusing or he does not fully understand what we are transmitting to him and that would be the noise in this thought experiment.

Then the character goes about his day applying more or less the instructions that we try to send through the dream and that would be the experiment, since he does not have the complete instructions, our character repeats the same day over and over again with many imperfections until he finally has the complete instructions to carry out the perfect day and get out of the loop and that would be the selected experiment.

All other days are discarded, of course, all within a simulation. we don't have anyone trapped in a real time loop. And why do researchers do this? Well, because what interests them is to analyze the characteristics of the transmission that reached the past from the future within the simulation. What is all this for? If it is just theory and simulations and a more or less interesting mental exercise, it is true, this technology does not help us in the real world to send messages to the past.

So don't expect to receive a WhatsApp from your future self with the lottery winner's number, unfortunately, no, but this research leads us to several curious conclusions, in the real world, the research is also useful, be careful, to create algorithms, for example, for noise correction in quantum communications or classical communications such as fiber optics, this can help us, among other things, to have a better quality internet, but it also shows that if there was a mechanism that allows you to create a noisy time curve, as these have created Researchers, the maximum amount of information transmittable to the past can be calculated exactly and can even surpass conventional communication, the one that moves towards the future, the one we do constantly.

Furthermore, this advance will help us understand information limits in strange landscapes such as the interior of black holes, it will help us better understand the information paradox in black holes, one of those issues that are beyond known science and that keep cosmologists awake at night.

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! The truth will set us free and science is the one that is closest to the truth!

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