Late at night, only Wang Yufei and Lu Yuxin were left in the underground laboratory of Yuxin Technology Service Co., Ltd.

It's not that everyone is unwilling to work overtime, but in fact, everyone's enthusiasm has been very high recently.

The company's separation and restructuring have provided tangible benefits to these researchers, not to mention the doubling of salaries, as well as predictable housing benefits. After the completion of each project, you can also enjoy half a month of paid leave, and the research topic is still the most cutting-edge technology, for these researchers who have been in the laboratory for a long time, staying up late or something, it is really nothing.

However, today's preliminary installation work has been completed, and in the commissioning stage, Wang Yufei is not worried about others doing it, so he simply let everyone get off work and rest first, and he continues to be busy on the assembly table.

"If there are two quantum computers, how do they exchange and transmit data between them?"

In the operation room of the huge quantum brain base, Lu Yuxin looked at Wang Yufei, who was wearing a clumsy dustproof suit and operating finely, and asked on a whim.

If you change someone, you may temporarily stop the operation because of this extremely sudden problem, and the whole debugging process needs to be very careful.

But Wang Yufei was obviously not disturbed by the question, and said directly: "It depends on the application environment." For example, if the two quantum computers are on the earth and the amount of data transmitted is not large, they can be satisfied with optical fiber and 5G transmission speed. However, if they are far away or the amount of data is particularly large, they may use an over-distance transmission protocol that has not yet appeared at this stage. ”

"Oh, over-distance transmission protocol, can ignore not only speed, but also the amount of data?" Lu Yuxin pouted.

"If the calculations are correct, it is. But this kind of transmission is just a transmission protocol in my illusion at the moment, and you know the over-distance effect of quantum entanglement, right? By reading the quantum state of one quantum to determine the quantum state of another quantum. As far as the current theory is concerned, it is impossible to transmit information by entangled states alone, let alone over-the-distance transmission. ”

"But these are all ideas of three-dimensional space. The unpredictability of the microscopic world is actually the norm in three-dimensional space, but if we look at the quantum entangled state from a higher dimensional perspective, what will happen? In the same way, the current speed of light is a limiting speed, and the mass of any object becomes infinite when the speed of light approaches the speed of light, which is also the basic reason why information cannot be transmitted beyond the speed of light. ”

"But if we can get information into the high-dimensional space, when we return to our space, the situation will definitely be different. At present, our research on high-dimensional space is to delineate a frame of reference first, and then introduce variables, such as Euclidean space, Minkowski space, and Galileo space, but obviously these are hypothetical, and we still don't know what high-dimensional space looks like. ”

Lu Yuxin's eyes widened in surprise, in fact, in the past six months, she has rarely discussed purely academic issues with Wang Yufei.

It's not that the girl has lowered her requirements for herself, but she still can't keep up with the progress of Wang Yufei's idea.

In the three disciplines of mathematics, physics and chemistry, the deeper the study, the higher the demand for thinking ability.

To learn basic algebra, you may only need the ability to compare, classify, generalize, and reason with simple operations. When you start learning advanced mathematics, you need reversible thinking ability and analytical comprehensive ability, and these abilities are not inferior to any genius.

But at a higher stage, what is needed is imagination, unrestrained spatial imagination, multi-dimensional thinking ability, and so on.

When it comes to studying quantum physics in the microscopic world, imagination is even more needed.

From atoms and molecules, to protons, neutrons, to quarks, leptons, propagators......

Scientific progress is constantly refreshing people's understanding of the microscopic world.

These particles are symmetrical, conserved, spin, and have wave-particle duality, but no one is sure that these particles are the basis of the existence of this world, because the induction between these particles cannot unify the four forces in nature, so scientists have introduced string theory, trying to build a near-perfect theoretical system through string theory.

Of course, it is not enough to have imagination in scientific hypotheses, but also to have deep knowledge and rigorous logical reasoning ability. These abilities need to be acquired in addition to being born.

To put it simply, Lu Yuxin has long felt that she can't keep up with Wang Yufei's rhythm.

Therefore, girls have already begun to pursue majors that they like and can easily control, such as psychology.

But he was caught by Wang Yufei as a coolie, responsible for data analysis and recording, of course, he inevitably talked about some professional things.

Of course, communication does not mean that Wang Yufei's idea is fully accepted, so Lu Yuxin questioned after being stunned: "Wait, any information transmission needs a carrier, you mean, the data transmission of the two quantum computers before the information carrier first enters the high-dimensional space, and then drills back?

"Channels are physical constants that we haven't discovered yet. Our understanding of the microcosm is similar to our understanding of the universe. But intuitively speaking, there must exist in high-dimensional space, otherwise gravity cannot be explained. The only pity is that our mathematics cannot explain the high-dimensional world. The inner product space and the Hilbert space are bold attempts at mathematical logic, but the problem is that the superimposed vectors inevitably have too much subjective arbitrariness. ”

"But when we establish the existence of a high-dimensional space, then there must be a passage to the high-dimensional space. This passage can help humans to move instantaneously, that is, over-distance. Ignore the limitations of time and space in three-dimensional space. Of course, it is basically impossible to achieve manned teleportation at the current level of science and technology on the earth. But information is possible. ”

Wang Yufei's movements in his hands did not stop, but his mouth was explaining his cognition of over-distance communication.

Of course, this does not convince Lu Yuxin, who is also scientifically literate.

"Teleportation, the more you talk about it, the more outrageous it becomes, you mean that with a quantum computer, you can teleport people from one place to another in an instant, and even travel through time?" Lu Yuxin questioned again.

Speaking of this question, Wang Yufei stopped the movement in his hand, turned his head, and said: "No, no, no, the concept of time is too complicated. Let's put it this way, we all know that countless one-dimensional lines can form two-dimensional surfaces, countless two-dimensional surfaces form our three-dimensional world, and countless three-dimensional worlds form a four-dimensional space. Let's assume that a thousand years from now, there is a group of very intelligent scientists on Earth, who have built a time machine, hoping to change history by going back in time. ”

"Now let's assume that they succeeded, they came to a planet with exactly the same coordinates as Earth, and the technology was indeed a thousand years behind them, so do you think they really traveled back in time to a thousand years ago?"

Lu Yuxin was a little confused, God knows that the two of them are just discussing the issue of quantum computers and ultra-long-distance information transmission, how can they discuss time and space again. Of course, as smart as she was, she thought of Wang Yufei's explanation of the four-dimensional world just now, and after a little thought, she replied: "What you mean is that they seem to have traveled through time, but in fact they are not, the so-called time machine just sent them to the four-dimensional world first, and then from the four-dimensional world, they were transported to a three-dimensional world." It's just that this three-dimensional world happens to be more backward in technology than their previous world?"

"That's right! That's what I meant. But there is another problem involved here, that is, the problem of the three-dimensional space coordinate system corresponding to the four-dimensional space. When this so-called time machine starts running, a coordinate system is definitely needed to determine the point of arrival. The mistake is that because it's a time machine, you have to introduce a coordinate of time. ”

But in fact, because the four-dimensional space is not composed of three-dimensional space and a time dimension as imagined, because the four-dimensional world does not have a three-dimensional concept of time at all, then this locked time coordinate may become a very interesting variable in the process of traversing. So this space-time machine first entered the four-dimensional world from a three-dimensional world, and then returned to the three-dimensional world, but this world arrived at another similar world because of the existence of variables, and it looked like a time-space travel was completed. ”

"It's a little different from what I had in mind. Because I always thought that there could be two similar solar systems in the universe. But this is obviously too underestimating this universe, which should finally have countless solar systems, but because of the dimension, we can't find out until technology has developed to a certain extent. So in my vision, this four-dimensional world, which is composed of countless three-dimensional worlds, is actually a public space. ”

"Any three-dimensional civilization that has developed to a certain level of technology can transmit information through this world of thought, and even physically transmit it. It's just that in order to achieve accurate transmission, we need to know not only our exact coordinates, but also the exact coordinates of our destination. Of course, this technology is only hypothetical, and with the current level of technology, it is impossible to really carry out cross-space teleportation. ”

"But it's not the same with over-distance messaging. Two Quantum Brains are equivalent to two precise coordinate points. The ultra-long-distance information transmission protocol is to let the information sent by the quantum brain directly enter the four-dimensional public space of the countless three-dimensional worlds through a certain physical constant, and after the information enters the four-dimensional space, through the protocol and coordinate transcoding, you can quickly find the location of another quantum intelligent brain, and then enter the three-dimensional space where the target is located through the four-dimensional public space. ”

"Because there is no concept of three-dimensional time in the four-dimensional space, no matter how far apart the two quantum brains are, this information can be transmitted instantaneously, even if it is tens of thousands of light years apart. So strictly speaking, the over-distance data transmission protocol has nothing to do with quantum entanglement. At the same time, because our information is instantaneously transmitted after passing through the four-dimensional public space, there is no possibility of being intercepted and deciphered in theory, so the security is greatly guaranteed. ”

"There is only one possible exception, and that is that there is a civilization that transcends all the three-dimensional worlds, or that the four-dimensional world has a unique civilization that can intercept all the information transmitted through the four-dimensional world. Theoretically it's possible, but it's all just conjecture, who knows? But what I know for sure is that if we want to find that physical constant, and if we want to verify whether the two quantum brains can actually transmit information over long distances, we first need to build a real quantum brain. You can't be like Google, tossing out a thing that fools people and showing off its might. ”

Lu Yuxin nodded and decided to approve of Wang Yufei's idea.

Well, send the information to a special public space first, and then pass it back from the public space, and now there is a lack of a science fiction movie to shoot like this, Lu Yuxin thinks this is a good idea, if there are investors.

"So are you going to continue? or go back to sleep with me. Lu Yuxin glanced at the time, it was already half past one in the morning, and after holding on for a while, the two of them could probably see what the capital looked like at 4 o'clock in the morning.

"Go back and rest, it's almost done. You can start the official test tomorrow, you go and pack your things first, and I'll finally test if there is any problem with the light source. ”

"Okay!"

Lu Yuxin walked out of the central area where Zhi Brain was located, passed through the electrostatic bridge, the air shower room, and returned to the dust-free locker room, skillfully took off a set of dust-proof equipment, and then returned to his own workshop.

In addition to a set of data collection and analysis instruments and a computer console, the workshop can also directly access the surveillance video of the seven laboratories and the central quantum brain area.

Lu Yuxin thought about it, called up the surveillance, and then chose a camera that would not expose too many images, and guided the video of the chat between the two just now, and then simply edited about five minutes of chat records and stored them on his mobile phone.

By the time she had done all this, Wang Yufei had already changed her clothes and came out of the brain area.

The two walked out of the laboratory through the encrypted elevator, and on the way, Yu Xin played the video he had just intercepted, and then asked, "Does this involve confidential content?"

Wang Yufei glanced at Lu Yuxin suspiciously, and then shook his head: "Of course, there is nothing secret about these. What are you going to do?"

Lu Yuxin hung her head, operated the mobile phone over and over again, and replied: "I decided to send it to Shi Xulin, and then ask him if he understands." ”

"Huh?"

"That's it!"

As soon as the words fell, Lu Yuxin's mobile phone shook.

Lu Yuxin picked it up and looked at it, and the other party replied with a question mark, and then followed up with a reply: "Sister, what time is it, what video did you post?"

"What time is it, haven't you slept yet? ”

Five minutes later, as soon as the two sat in the car, Lu Yuxin's mobile phone rang again.

"What's the same thing? Four-dimensional public information delivery area? Are you serious?"

Lu Yuxin quickly replied: "I'm relieved to hear you say that." ”