The classical magical system believes that the most important criterion for judging whether a theory is correct is whether the theory itself is self-consistent and whether it can explain the laws of experimentation well, even if the theory goes against human intuition or some ideas that have long been ingrained in cognition, as long as it can meet these two points, then mages can accept the theory.

For example, Reiner initially overturned the theory of the four elements of earth, water, wind, and fire, and instead put forward the theory of the coexistence of multiple elements, although this new view had a considerable impact on the alchemy system for the past hundreds of years, but after experimental verification, Reiner's theory was correct, so mages began to gradually accept such a theory.

Another example is quantum theory, although it has gone beyond the realm of common sense and fundamentally subverted the world of people's cognition, but it is also acceptable because it successfully explains experimental phenomena.

Legendary mages such as Lord Braggs and Lord Alberton have laid down two conditions to test the success of a theory.

The first is that the theory of magic must be correct, which is actually the degree to which the prediction of the theory of magic conforms to the results of the experiment, and the more accurately the theory describes the experiment, the more the theory tends to be correct.

The second is that the theory of magic must give a complete description, which is simply understood that each element of magic that actually exists must have its corresponding element in the theory of magic, that is, a complete theory of magic must be able to accurately describe every element of magic.

For quantum theory, the first condition seems to have passed, and quantum theory is able to successfully predict many anomalies of microscopic particles and give solutions.

But the second condition is somewhat contradictory to quantum theory.

First, according to Ian Gray's uncertainty principle, mages can never accurately measure the position and momentum of a microscopic particle at the same time, which violates the criterion of completeness.

Secondly, according to the description of general relativity, the speed of light is the limit of speed, and the transmission of any event and information cannot exceed the speed of light, but in quantum theory, the state of two entangled quanta can be determined, that is, observing the spin state of one of the quanta, the spin state of the other quantum can be confirmed, and this confirmation ignores the distance.

"In a quantum system with zero total spin, if the spin of one particle is a certain value, then the spin of the other particle can be accurately calculated by that value."

Reiner muttered to himself as he repeated the results of the mages' experiments.

This is currently one of the biggest challenges to quantum theory.

Because this quantum entanglement phenomenon is not limited by distance at present, to be precise, the spin state of another particle is determined by the spin state of the current particle, and the mages do not even need to observe the state of the other particle.

This phenomenon quickly reminded the mages of the Sauron Xenomorph.

The magic resistance of the Sauron xenomorph is that as long as a Sauron xenomorph is killed by a specific spell, then this magic resistance will be transmitted to all the Sauron xenomorphs, almost at the same time and without time, which is equivalent to the evolution of the entire Sauron xenomorph group in a short period of time.

This is incomprehensible and the biggest trouble.

This means that mages are not allowed to use some extremely destructive spells at will, although this can destroy most of the incoming Sauron xenos, but once used, the impact of such spells on other Sauron xenos in the future will be minimal.

After discovering the phenomenon of quantum entanglement, the mages put forward an idea, that is, the active evolution ability of the Sauron xenomorph is actually based on the quantum theory, and each Sauron xenomorph will have some quanta entangled with other individuals, which is very easy to explain, and the reproduction of the Sauron xenomorph itself is very easy to cause this phenomenon.

In the quantum entanglement phenomenon, one of the individuals of the Sauron xenomorph is struck and the state of the quantum is changed at the same time, so that this state can be transmitted to other individuals, so in an instant, all the individuals get the information of the spell, and thus produce countermeasures.

The mages wanted to parse this phenomenon and try to find a way to combat the Sauron xenomorphs.

However, the nature of quantum entanglement leads to one of the biggest problems, which is that if the distance between two particles is too long, then the results of such observations will exceed the speed of light.

If two particles are one light-year apart, then according to the general theory of relativity, it will take at least a year for the observers to know the spin states of the two particles at the same time.

However, in quantum theory, the spin state of these two particles is related and entangled, as long as the state of one particle is known, then the state of the other particle can be known immediately, and the transmission of this information is instantaneous.

This goes against the inference of general relativity that no information can be transmitted beyond the speed of light.

"So, relying on the phenomenon of quantum entanglement, we can make communication devices that transmit information very quickly?"

Arymia tilted her head, she was supposed to bring afternoon tea to Reiner in the laboratory, but found that Reiner did not conduct the experiment as usual, but sat in a chair, thinking about the blank blackboard, so she asked curiously, and after receiving Reiner's patient explanation, she thought so.

"Theoretically, it is possible, because the current communication is at most electromagnetic wave communication, subject to the speed of light, although the magic computer has laid a communication optical cable, in the half-plane that can be reached now, the communication delay is almost negligible, but if you want to go to the sea of stars in the future, this communication delay is a problem that must be solved."

Reiner was a little surprised, he didn't expect Arymia to think of this so quickly, he originally thought that Arymia didn't care too much about the problems related to the magic computer and the Internet.

"But what does this completeness mean, Lord Braggs, that every actually existing element of magic must, uh, have its counterpart in the theory of magic, and what does this have to do with quantum entanglement?"

Although Arimia can barely understand Reiner's problem, she still doesn't quite understand the core of Reiner's problem.

"Well, I can explain this to you in a little game."

Reiner nodded, the reason why he explained to Arymia in such detail was partly to make his thoughts clearer.

He pulled out a stack of cards from his storage bag, a very popular item used in the game.

"Let's simulate quantum entanglement."